should i install python image library by myself?
when i type import image in the python interactive command, i am surprised to find that it does not work. the details are as follows: >>> import image Traceback (most recent call last): File "", line 1, in ? ImportError: No module named image i wonder the image library should be a buildin module, then why i cannot import it? what's wrong? or some version of python does not include image library as a buildin module? so can anybody recommend a version of python which include image libary, thank you ; ) -- http://mail.python.org/mailman/listinfo/python-list
Minimize Bandwidth
Hello Chaps, I have a python application that hits a web service on a regular basis to post a string of CSV log data and I'm looking to minimize the amount of bandwidth that the application uses to send the log data. Is there any way to encode the string into base64 or something, that I can then post and decode at the other end? Is that likely to save me bandwidth perhaps? I don't really know much about this encoding stuff, but the smaller I can compress the string the better. Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Binary / SOAPpy
Hello Guys,
I have a WebService call which returns an array, the first element in that
array is the binary for a zip file, however I'm having trouble writing that
binary string into an actual file when it arrives, I've tried the following
method.
Result = call to the webservice that returns the array.
file = open("Zips/1.zip", "wb")
file.write(result[0])
file.close()
But this throws the error message:
file.write(result[0])
TypeError: argument 1 must be string or read-only buffer, not instance
Does anyone know what I might be doing wrong? Once I've resaved this file
can then unzip it and get at all its lovely content.
Thanks for any input guys,
Rob
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Strange Thread Issue
Hello Guys, I'm having an issue with a thread which I've not come across before and it has be baffled. The thread doesn't really do a lot, it simple contains a popen command to run something from cmd, now then i trigger the thread form my main application using the .start() method nothing happens, the command prompt program isn't triggered, yet as soon as a ctrl+c to close my application the thread then seems to kick into life and work. Any ideas what is causing this? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Zip File Woes
Hello Guys,
I'm having a MASSIVE headache today with zip files, I had it working a while
ago but it all seems to have stopped in the past 30 minutes and I can't
figure out why.
I'm simply trying to write a function that will unzip a file, simple as
that. I've currently got this code:
Import zipfile
zip = zipfile.ZipFile('Media/Media.zip', 'r')
unzip(zip)
zip.close()
def unzip(zip):
for name in zip.namelist():
newname = 'Media/%s' % (name)
file(newname, 'wb').write(zip.read(name))
Now when I try and run this i get the following error message:
File "/usr/lib/python2.4/zipfile.py", line 242, in _RealGetContents
raise BadZipfile, "File is not a zip file"
zipfile.BadZipfile: File is not a zip file
However, if I copy the zip file off the unit client onto my windows box and
unzip it and it works absolutely perfectly, all the files are extracted as I
would expect, which leads me to think the zip file is fine, and i must just
be missing something in my code.
Any ideas guys? I'm tearing my hair out here.
Rob
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RE: Zip File Woes
Just as an update guys:
Before my zip code featured below I have another piece of code that creates
the zip file from a binary string, like this:
#f3 = open("Media/Media.zip", "wb")
#f3.write(base64.decodestring(MediaBinary))
#f3.close
Now, with that code commented out like that so the unzip code is running on
the file generated last time the code was run it works fine, but if I try
and unzip after the file has been freshly created I get that error, I've
even tried placing a 2 second sleep command in between them and still get
the problems.
Thanks guys,
Rob
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Robert Rawlins - Think Blue
Sent: 27 June 2007 15:10
To: python-list@python.org
Subject: Zip File Woes
Hello Guys,
I'm having a MASSIVE headache today with zip files, I had it working a while
ago but it all seems to have stopped in the past 30 minutes and I can't
figure out why.
I'm simply trying to write a function that will unzip a file, simple as
that. I've currently got this code:
Import zipfile
zip = zipfile.ZipFile('Media/Media.zip', 'r')
unzip(zip)
zip.close()
def unzip(zip):
for name in zip.namelist():
newname = 'Media/%s' % (name)
file(newname, 'wb').write(zip.read(name))
Now when I try and run this i get the following error message:
File "/usr/lib/python2.4/zipfile.py", line 242, in _RealGetContents
raise BadZipfile, "File is not a zip file"
zipfile.BadZipfile: File is not a zip file
However, if I copy the zip file off the unit client onto my windows box and
unzip it and it works absolutely perfectly, all the files are extracted as I
would expect, which leads me to think the zip file is fine, and i must just
be missing something in my code.
Any ideas guys? I'm tearing my hair out here.
Rob
--
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Threads Dying?
Hello Guys, I've got an application that seems to be a little bit unstable and freezes quite a bit, and I'm suspecting it's something in one of my threads that's causing the problem, when does a thread die? And how can I be sure that its dyeing when its mean to be? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
XML Parsing Help,
Hello Chaps, I'm looking for some help with XML parsing, I've been playing around with this over the past few days and the only solution I can come up with seems to be a little slow and also leaves what I think is a memory leak in my application, which causes all kinds of problems. I have a very simple XML file which I need to loop over the elements and extract the attribute information from, but the loop must be conditional as the attributes must meet a certain criteria. My current solution is using minidom, which I've read isn't one of the better parsers, if anyone knows of any that are better for the task I would love to hear it, the content is extracted regularly so whatever we chose needs to be quick. Take a look at this brief example of the XML we're dealing with: Now what I need to do is loop through the 'event' elements and locate the first one which has a type of '2' and return the name and location, if it is unable to find any events with the type of 2 then I want it to return the default event which is defined by the attributes of the schedules element. I'm pretty inexperienced with parsing XML in python and could really use some help selecting a parser and writing the code, I'm sure it's all quite simple I'm just looking for the best solution. Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Application Crashing
Hello Guys, I find my application is freezing/crashing every now and then and it becoming a bit of a frustration, so this morning I sat down to try and locate the problem. After doing some debugging I think I've found the line of code that causes my problem. Print 'Read Results' New = e.read() Print 'Results Read' The last thing the application does is print the words 'Read Results' which leads me to think that the troublesome line is e.read(). This line is reading the contents of a file object created by a popen command. This runs without fail most of the time, but on a reasonably regular occurrence it seems to crash my app. I've tried wrapping it in a try/except, which I don't know much about and that doesn't appear to make any difference, the app still crashes. print 'Reading Push' try: new = e.read() except: new = 'fault' Print 'Results Read' I'm not sure if this makes any difference, but this is all being run from within a thread. I need some help on handling this a little better to avoid my application from dying on me, if anyone can offer some advice on what can be done it would be greatly appreciated, I'm hoping just a small code solution will be available. Thanks guys, I look forward to hearing from you, Rob -- http://mail.python.org/mailman/listinfo/python-list
DatePart From String
Hello Guys, I have a date/time as a string which looks like this: 2007-02-01 00:00:00 I'm trying to get my hands on the different date parts of that string in the following formats: Time Only: 00:00:00 Day As Number: 01 Month As Number: 02 Day As Word: Monday I've tried using the time.strptime() function without much success so thought I'd come and ask your advice. Thanks guys for any advice, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: DatePart From String
Hello Dave,
Thanks for getting back to me, I had been trying to use it like this:
time.strptime('2007-01-01 00:00:00','%H:%M:%S')
I was getting an error thrown at me: ValueError: time data did not match
format: data=2007-01-01 00:00:00 fmt=%H:%M:%S
I see how your solution works, but I'm hoping to trip is down a little bit as
this has to be used in a conditional statement such as the one below:
If time.strftime('%H:%M:%S') > time.strptime('2007-01-01
00:00:00','%H:%M:%S')
Print 'Later In The Day'
You see how that works? I'm basically trying to check if the current time is
later that the one defined in my string.
Are you able to give me a working example of how I might do this with my
conditional?
Thanks Dave,
Rob
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave
Sent: 03 July 2007 10:46
To: python-list@python.org
Subject: Re: DatePart From String
Robert Rawlins - Think Blue thinkbluemedia.co.uk> writes:
> I’ve tried using the time.strptime() function without much success so
> thought I’d come and ask your advice.
>
How exactly does it not work?? This works for me:
from time import mktime, strptime
from datetime import datetime
datetime_string = '2007-02-01 00:00:00'
datetime_object = datetime.fromtimestamp(
mktime(strptime(datetime_string,'%Y-%m-%d %H:%M:%S')))
print datetime_object.year
print datetime_object.month
print datetime_object.day
print datetime_object.hour
print datetime_object.minute
print datetime_object.second
HTH,
Dave
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POpen - Wait For Process To Complete
Hello guys,
Quite a simple one I'm hoping. I've got a process that I run using popen
which writes to a file, I'm then going to read the file and parse its
contents. However, getting the application to wait until the process is
complete and finished writing before it reads and parses the file is
becoming complicated.
Popen is meant to have a wait() function along with a poll() function
(according to the docs), both of which can be used to make the app wait for
the process to finished, but for some reason I can't get them working, when
I try this:
Import popen2
Process = popen2.popen4('This is my command to run from cmd')
Process.wait()
f = open('path/to/output/file.txt')
new = f.read()
f.close()
It throws back the following error to me:
push.wait()
AttributeError: 'tuple' object has no attribute 'wait'
Which is fair enough as popen4 returns a tuple containing the output streams
from the cmd command, but how the hell can I have it wait so I can read the
physical files?
I'll be interested to hear your thoughts guys,
Rob
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Which Python Version
Hello Chaps, Is there a command I can run to confirm which version of python I'm running? Another thing I've always wondered, should i be running my applications using './MyFile.py' or 'Python MyFile.Py' what are the benefits of each method? One thing I have noticed is that when I used 'Python MyFile.Py' my processor usage was a lot higher, is that normal? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Which Python Version
Hello Chaps, Is there a command I can run to confirm which version of python I'm running? Another thing I've always wondered, should i be running my applications using './MyFile.py' or 'Python MyFile.Py' what are the benefits of each method? One thing I have noticed is that when I used 'Python MyFile.Py' my processor usage was a lot higher, is that normal? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: Which Python Version
Thanks Tim, Greatly appreciated, I've been having a few problems with one of my apps recently crashing at all sorts of odd intervals without throwing an error or anything like that, So I'm upgrading to 2.5 to see if they'll make life any simpler. Thanks mate, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Golden Sent: 04 July 2007 11:36 Cc: python-list@python.org Subject: Re: Which Python Version Robert Rawlins - Think Blue wrote: > Is there a command I can run to confirm which version of python I'm running? From outside Python: python -V (that's a capital V) From inside Python: import sys print sys.version (and a couple of more easily parseable alternatives; look at the sys module docs) TJG -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Which Python Version
Hello Chaps, Is there a command I can run to confirm which version of python I'm running? Another thing I've always wondered, should i be running my applications using './MyFile.py' or 'Python MyFile.Py' what are the benefits of each method? One thing I have noticed is that when I used 'Python MyFile.Py' my processor usage was a lot higher, is that normal? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Which Python Version
Hello Chaps, Is there a command I can run to confirm which version of python I'm running? Another thing I've always wondered, should i be running my applications using './MyFile.py' or 'Python MyFile.Py' what are the benefits of each method? One thing I have noticed is that when I used 'Python MyFile.Py' my processor usage was a lot higher, is that normal? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Which Python Version
Hello Chaps, Is there a command I can run to confirm which version of python I'm running? Another thing I've always wondered, should i be running my applications using './MyFile.py' or 'Python MyFile.Py' what are the benefits of each method? One thing I have noticed is that when I used 'Python MyFile.Py' my processor usage was a lot higher, is that normal? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
GObject and Python 2.5
Hello Guys, Firstly I should apologise for all the mails that keep landing on the list, my SMTP server (supplied by my ISP) seems to be playing silly buggers and sending multiples. I've just installed Python 2.5 on my Debian system and I'm trying to run my application and I get 'ImportError: No module named gobject' thrown back at me. I think I've successfully install the glib library using apt-get but the problem still persists. There is obviously a module I'm missing, any ideas what it might be? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Parsing Help
Hello Guys, I'm looking for some help building a function which can parse some XML for me using ElementTree. The document is of a very consistent format and I've copied an example of the document below. Now, the piece of information I'm looking to retrieve is inside the element and is, in this example , however I want the function to return the standard integer value and not the unit8 encoded version, so instead of my function returning '0x05' it just needs to return '5' which is the standard integer version. I will be passing this XML into the function as a string, so the function will be formed something like this: Def myFunction(XmlAsString): Pass the xml and exract my value Return the value as an integer... I'm not sure on the best method to do this, I just want something nice and quick, lightweight and that's not resource hungry. Can anyone offer some advice on this? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Time A Script
Hello Guys, What's the best way to time how long it takes a script to run, from top to bottom and then have it print that execution time at the end? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Launch One Application From Another
Hello Guys, I'm looking for the best method to launch one Python application from another? Is something like sub process going to be my best bet? Or is there something more specific for launching one python app from another? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: Dict Help
Thanks Gabriel,
That all works a charm, Iteration on this isnt important for me so the SET
will work much better I think, I had read about them before but have never
used them, I'm glad to see it works so simply.
Thanks,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Gabriel Genellina
Sent: 15 July 2007 20:33
To: python-list@python.org
Subject: Re: Dict Help
En Sun, 15 Jul 2007 11:39:24 -0300, Robert Rawlins
<[EMAIL PROTECTED]> escribió:
> I'm looking for some help expanding on a dictionary I've got and storing
> multiple values per key and the best way to do it. I'm guessing that I
> need to store a list inside the value of the dictionary, but I'm not
> quite sure how that can be achieved, and also how to check for values in
> that list.
> Here is a brief example of what I want to be able to build:
> Key Value
> 00:0F:DE:A8:AB:6F
>
6C66F14B-FED6-D1A4-62EAAD881E9133F0.jpg,01DBB592-F7EB-B000-7F250FD8A2CE158F.
gif,533EAE0F-B211-B2D8-4C2DB662CCECFBD7.3gp
> 00:17:B0:A0:E7:09
>
6C66F14B-FED6-D1A4-62EAAD881E9133F0.jpg,01DBB592-F7EB-B000-7F250FD8A2CE158F.
gif
> 00:1B:98:16:21:E4
> 6C66F14B-FED6-D1A4-62EAAD881E9133F0.jpg
There are a few ways to do it. Just translating your own words into
Python, use a dictionary with a list of values.
> Now I really need to have two functions, one of which appends a value to
> the list for a specified key, so I have the key and the new value as
> strings, I then want to locate that key and append the list with the new
> value.
The simplest way:
d = {}
# add a pair key, value
if key not in d:
d[key] = [value]
else:
d[key].append(value)
> The second function I need, is to check for the existence of a value in
> the list of a particular key, again I have the key and the value and I
> want to do something like:
> if value in list of values for key:
>do something here...
# check for a key, value
exists = key in d and value in d[key]
> The final function that would be helpful to me would to be able to
> remove a value from the list for a specific key.
# remove value from key's values
if key in d and value in d[key]:
d[key].remove(value)
> I'm not sure if a list as the value in a dict is possible, or if its the
> best way to achieve this, It just made logic sense to me so thought I'd
> come and get your thoughts on this. If anyone has any better suggestions
It's perfectly possible as you can see. Now, depending on how many values
you have, or how often do you test, you might replace the list with a set.
Sets are unordered collections (you will loose the insertion order) but
are better suited for a "contains" test (O(1) instead of O(n) for a list)
And you might replace the dictionary with a defaultdict. The insertion
would become:
from collections import defaultdict
d = defaultdict(set)
# add a pair key, value
d[key].add(value)
The existence check and remove method do not change.
Dicts, lists and sets are documented here:
<http://docs.python.org/lib/types.html> and defaultdict
<http://docs.python.org/lib/defaultdict-objects.html>
--
Gabriel Genellina
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Access Object From 2 Applications or Fix Scheduler
Hello Guys, I have two applications which I need to get talking and sharing an object, what's the best way to do this? Basically my first application parses an XML document into a bunch of lists and tuples etc, and I need to access the data in these lists and tuples from my second application. Is this possible? And what's the simplest method? This problem all evolves from a hack/work around I've had to place together as I have been having problems with sched, these two applications used to be a single one to start with but for some reason when scheduling tasks using the sched module they wouldn't ever run when supposed too, so I'd schedule it to run every 2 minutes and it would run between 3 and 15 minutes :-s so I ripped it out into its own application and it now runs every 2 minutes exactly. I either need to fix my sched issues or the memory share, either way I'm quite happy, just need to get it working smoothly. Any ideas? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: Access Object From 2 Applications or Fix Scheduler
Thanks Hendrik & Alex for your suggestions, I'm glad to see that there are lots of options for me here, and I'll give them all of a decent exploration to see what my best option is, starting the second app in a named pipe sounds like a fair solution, but I've not don't this before, how easy is it to have the second application ready to receive the new dictionary data? Just out of interest though I'd still like to know why my first application schedules didn't work properly, should I be starting them all in their own thread? Would that work better? Thanks Guys, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hendrik van Rooyen Sent: 16 July 2007 07:29 To: python-list@python.org Subject: Re: Access Object From 2 Applications or Fix Scheduler Robert Rawlins - Think Blue wrote: >Hello Guys, > >I have two applications which I need to get talking and sharing an >object, what s the best way to do this? Basically my >first application parses an XML document into a bunch of lists and tuples etc, and I need to access the data in these lists >and tuples from my second application. Is this possible? And whats the simplest method? > >This problem all evolves from a hack/work around Ive had to place >together as I have been having problems with >sched, these two applications used to be a single one to start with but for some reason when scheduling tasks using the >sched module they wouldnt ever run when supposed too, so Id schedule >it to run every 2 minutes and it would run >between 3 and 15 minutes :-s so I ripped it out into its own application and it now runs every 2 minutes exactly. > >I either need to fix my sched issues or the memory share, either way >Im quite happy, just need to get it working >smoothly. > >Any ideas? > You have already split the thing, so I would: schedule the XML parser and make it do its stuff. then pickle the results using cPickle then from this first thing, either: write the pickles to temp files and start the second thing using eg os.system() or start the second thing and use a named pipe to pass the pickles over for unpickling and processing, or use one of the popens, or have a look at Pyro, or start the second thing as a thread and use a Queue.. of course this whole scheme will fall apart if the combined processing takes longer than the scheduling interval. HTH - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
RE: Access Object From 2 Applications or Fix Scheduler
Also Hendrik, I should probably mention that the second application is a constant running application, it's nothing something that can just be 'started' by the first one, its running non-stop and just needs data passed into it regularly when the first application finds it. Application 1 Application 2 Work with dict Work with dict Work with dict Work with dict New XML Found, Parse Into Dict --> Work with new dict Work with new dict Work with new dict Work with new dict You see how that works? Application 1 has a function that runs every minute and _may_ find a new xml file, if it does then I need it to parse that file into a list of dictionary and then pass that into application 2, which then starts using it :-) Now we may be able to avoid this if there is some type of file watcher function available in python, my second application could then just watch the XML file and as soon as a new one is available parse it itself. Is that something you've heard of? Thanks, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hendrik van Rooyen Sent: 16 July 2007 07:29 To: python-list@python.org Subject: Re: Access Object From 2 Applications or Fix Scheduler Robert Rawlins - Think Blue wrote: >Hello Guys, > >I have two applications which I need to get talking and sharing an >object, what s the best way to do this? Basically my >first application parses an XML document into a bunch of lists and tuples etc, and I need to access the data in these lists >and tuples from my second application. Is this possible? And whats the simplest method? > >This problem all evolves from a hack/work around Ive had to place >together as I have been having problems with >sched, these two applications used to be a single one to start with but for some reason when scheduling tasks using the >sched module they wouldnt ever run when supposed too, so Id schedule >it to run every 2 minutes and it would run >between 3 and 15 minutes :-s so I ripped it out into its own application and it now runs every 2 minutes exactly. > >I either need to fix my sched issues or the memory share, either way >Im quite happy, just need to get it working >smoothly. > >Any ideas? > You have already split the thing, so I would: schedule the XML parser and make it do its stuff. then pickle the results using cPickle then from this first thing, either: write the pickles to temp files and start the second thing using eg os.system() or start the second thing and use a named pipe to pass the pickles over for unpickling and processing, or use one of the popens, or have a look at Pyro, or start the second thing as a thread and use a Queue.. of course this whole scheme will fall apart if the combined processing takes longer than the scheduling interval. HTH - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
RE: Dict Help
Morning Gabriel,
I'm looking for a little more advice on this dictionary/list to
defaultdict/set conversion that we were talking about, there were a few
things I was looking to clarify. Firstly, what is the difference between a
standard dict and a default dict? Is it purely a performance issue?
This dict is likely to grow pretty large and is read/written on a very
regular basis so the better performing one is going to work best for me.
Also, am I still able to iterate over a set in the same way I can a list?
Here is an example of my add function at the moment, how can that be
converted to a defaultdict/set instead of the dict/list approach?
self.History = {}
def addHistory(self, address, media):
if address not in self.History:
self.History[address] = []
self.History[address].append(media)
Thanks Gabriel,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Robert Rawlins - Think Blue
Sent: 15 July 2007 20:47
To: 'Gabriel Genellina'; python-list@python.org
Subject: RE: Dict Help
Thanks Gabriel,
That all works a charm, Iteration on this isnt important for me so the SET
will work much better I think, I had read about them before but have never
used them, I'm glad to see it works so simply.
Thanks,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Gabriel Genellina
Sent: 15 July 2007 20:33
To: python-list@python.org
Subject: Re: Dict Help
En Sun, 15 Jul 2007 11:39:24 -0300, Robert Rawlins
<[EMAIL PROTECTED]> escribió:
> I'm looking for some help expanding on a dictionary I've got and storing
> multiple values per key and the best way to do it. I'm guessing that I
> need to store a list inside the value of the dictionary, but I'm not
> quite sure how that can be achieved, and also how to check for values in
> that list.
> Here is a brief example of what I want to be able to build:
> Key Value
> 00:0F:DE:A8:AB:6F
>
6C66F14B-FED6-D1A4-62EAAD881E9133F0.jpg,01DBB592-F7EB-B000-7F250FD8A2CE158F.
gif,533EAE0F-B211-B2D8-4C2DB662CCECFBD7.3gp
> 00:17:B0:A0:E7:09
>
6C66F14B-FED6-D1A4-62EAAD881E9133F0.jpg,01DBB592-F7EB-B000-7F250FD8A2CE158F.
gif
> 00:1B:98:16:21:E4
> 6C66F14B-FED6-D1A4-62EAAD881E9133F0.jpg
There are a few ways to do it. Just translating your own words into
Python, use a dictionary with a list of values.
> Now I really need to have two functions, one of which appends a value to
> the list for a specified key, so I have the key and the new value as
> strings, I then want to locate that key and append the list with the new
> value.
The simplest way:
d = {}
# add a pair key, value
if key not in d:
d[key] = [value]
else:
d[key].append(value)
> The second function I need, is to check for the existence of a value in
> the list of a particular key, again I have the key and the value and I
> want to do something like:
> if value in list of values for key:
>do something here...
# check for a key, value
exists = key in d and value in d[key]
> The final function that would be helpful to me would to be able to
> remove a value from the list for a specific key.
# remove value from key's values
if key in d and value in d[key]:
d[key].remove(value)
> I'm not sure if a list as the value in a dict is possible, or if its the
> best way to achieve this, It just made logic sense to me so thought I'd
> come and get your thoughts on this. If anyone has any better suggestions
It's perfectly possible as you can see. Now, depending on how many values
you have, or how often do you test, you might replace the list with a set.
Sets are unordered collections (you will loose the insertion order) but
are better suited for a "contains" test (O(1) instead of O(n) for a list)
And you might replace the dictionary with a defaultdict. The insertion
would become:
from collections import defaultdict
d = defaultdict(set)
# add a pair key, value
d[key].add(value)
The existence check and remove method do not change.
Dicts, lists and sets are documented here:
<http://docs.python.org/lib/types.html> and defaultdict
<http://docs.python.org/lib/defaultdict-objects.html>
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Subprocess Poll() to sport Application Crash
Hello Guys, I have an application which launches a sub-process using the sub process/Popen module, which seems to work great. However on occasion the launched process will crash, it doesn't appear to full terminate though as when I run a 'top' command from the Linux system the process is still displayed in the list, it just appears to be dormant and the TIME+ for the application stops incrementing. Can I use the poll() method from the sub-process object to test for this? I would love to test it however the crash is so rare it's very difficult to simulate, so thought I'd try and see if anyone has any experience of this. Thanks chaps, Rob -- http://mail.python.org/mailman/listinfo/python-list
Subprocess Poll
Hello Guys, I have an application which launches a sub-process using the sub process/Popen module, which seems to work great. However on occasion the launched process will crash, it doesn't appear to full terminate though as when I run a 'top' command from the Linux system the process is still displayed in the list, it just appears to be dormant and the TIME+ for the application stops incrementing. Can I use the poll() method from the sub-process object to test for this? I would love to test it however the crash is so rare it's very difficult to simulate, so thought I'd try and see if anyone has any experience of this. Thanks chaps, Rob -- http://mail.python.org/mailman/listinfo/python-list
Copy List
Hello Guys,
What's the best way to create a copy of a list? I've seen several method and
I'm not sure what to use. This will be in a class and one method creates a
list which I then want to move to the self scope, like so:
__Init__(self):
Self.myList = []
regenerateList(self):
newList = []
for somthing in somthing:
newList.append('SomeStuff')
self.Mylist = newList.copy()
See, The iteration and rebuilding of the list could be quite slow, during
which time the application could be reading from the self.mylist variable so
i think simply doing this:
regenerateList(self):
self.myList = []
for somthing in somthing:
self.myList.append('SomeStuff')
Might cause a few inconsistencies in the list if it's being read from whilst
I'm appending too it, so I'm guessing that the top example is the best
method, I'm just looking for the best way to copy() that list into the self
scope, should i be using copy(), deepcopy() or simply self.mylist = newlist?
Thanks guys,
Rob
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Log Memory Usage
Hello Guys, I have an embedded application with a suspected memory leak which I'm trying to confirm. You see, the application seems to crash unexpectedly and when looking at the resource consumption after the crash system memory has crept up to nearly 100%. However this takes quite a long time to occur, so sitting and watching the application run isn't a very effective way of doing it, so I'm looking for the best way to log the system memory every minute or two. I have a scheduled event which occurs every minute, i just need a code solution to give me the systems current memory consumptions details, is there perhaps something in the os module? Thanks for any suggestions guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
DateTime Differance
Hello Guys, I've used the eGenix date time module to create two date time objects which I'm now looking to compare like so: If date 1 is more than 5 minutes older than date 2: Do something here... After reading through the egenix documentation I'm still a little confused as the best way to do this. Can anyone offer any advice? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Byte-Array to String
Hello Guys,
I have a byte array passed to me by dbus and I'm looking to convert it into
a string? Is that possible? Sorry for seeming like a putts with these
questions, I'm not used to all these complex data types :-D
The byte array looks something like this when printed to screen.
dbus.Array([dbus.Byte(54), dbus.Byte(0), dbus.Byte(24), dbus.Byte(9),
dbus.Byte(0), dbus.Byte(0), dbus.Byte(10), dbus.Byte(0), dbu
s.Byte(0), dbus.Byte(0), dbus.Byte(0), dbus.Byte(9), dbus.Byte(0),
dbus.Byte(1), dbus.Byte(53), dbus.Byte(3), dbus.Byte(25), dbus.
Byte(16), dbus.Byte(0), dbus.Byte(9), dbus.Byte(2), dbus.Byte(0),
dbus.Byte(53), dbus.Byte(3), dbus.Byte(9), dbus.Byte(1), dbus.By
te(1)], signature=dbus.Signature('y'))
Thanks again,
Rob
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RE: Byte-Array to String
Thanks for getting back to me on this Tim, *pauses pulling his hair out for
a moment.
I'm back on this damn API and its driving me crazy I get three options
really for returning a service record from the API, they look like this.
array{uint32} GetRemoteServiceHandles(string address, string
match)
This method will request the SDP database of a
remote
device and retrieve the service record handles. To
request service browse send an empty match string.
Possible errors: org.bluez.Error.InvalidArguments
org.bluez.Error.InProgress
org.bluez.Error.ConnectionAttemptFailed
org.bluez.Error.Failed
array{byte} GetRemoteServiceRecord(string address, uint32
handle)
This method will request the SDP database of a
remote
device for a service record and return the binary
stream of it.
Possible errors: org.bluez.Error.InvalidArguments
org.bluez.Error.InProgress
org.bluez.Error.Failed
string GetRemoteServiceRecordAsXML(string address, uint32
handle)
This method will request the SDP database of a
remote
device for a service record and return its data in
XML
format.
Possible errors: org.bluez.Error.InvalidArguments
org.bluez.Error.InProgress
org.bluez.Error.Failed
The first method, when I print its results just gives me
dbus.Array([dbus.UInt32(65547L)], signature=dbus.Signature('u')) the method
gives me that byte array and the third doesn't appear to work at all :-D
Unfortunately nowhere seems to document what exactly those arrays contain,
so I'm trying to crack one open and find out, but as you can see, I'm not
having much luck. Perhaps this is a DBus thing, they do have a mailing list
so I'll give them a go in a while.
If you have any brain waves let me know mate, I'll add another beer to the
tab,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Tim Golden
Sent: 19 April 2007 15:54
Cc: python-list@python.org
Subject: Re: Byte-Array to String
Robert Rawlins - Think Blue wrote:
> I have a byte array passed to me by dbus and I'm looking to convert it
into
> a string? Is that possible? Sorry for seeming like a putts with these
> questions, I'm not used to all these complex data types :-D
>
> dbus.Array([dbus.Byte(54), dbus.Byte(0), dbus.Byte(24), dbus.Byte(9),
> dbus.Byte(0), dbus.Byte(0), dbus.Byte(10), dbus.Byte(0), dbu
> s.Byte(0), dbus.Byte(0), dbus.Byte(0), dbus.Byte(9), dbus.Byte(0),
> dbus.Byte(1), dbus.Byte(53), dbus.Byte(3), dbus.Byte(25), dbus.
> Byte(16), dbus.Byte(0), dbus.Byte(9), dbus.Byte(2), dbus.Byte(0),
> dbus.Byte(53), dbus.Byte(3), dbus.Byte(9), dbus.Byte(1), dbus.By
> te(1)], signature=dbus.Signature('y'))
No idea, but what happens when you iterate over it?
for i in array_thingy:
print i
Or does it support the buffer interface?
for i in buffer (array_thingy):
print i
If it did then you can at least get access to its
innards and construct some kind of string representation.
I've no idea what the numbers are supposed to represent,
so I don't know what "convert it to a string" is likely
to imply. This looks rather more like a dbus question than
a strictly Python one. Is there a DBus mailing list or
what-have-you?
TJG
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RE: Byte-Array to String
Morning Steve,
That stuff looks mighty promising, I did play around with the toString()
function yesterday but couldn't get the damned thing working. The syntax has
me a little muddled, perhaps you can help out on this by taking a look at my
code.
#!/usr/bin/python
import dbus
bus = dbus.SystemBus()
obj = bus.get_object('org.bluez', '/org/bluez')
obj = bus.get_object('org.bluez', '/org/bluez/hci0')
adapter = dbus.Interface(obj, 'org.bluez.Adapter')
# Search For Obex Push Protocol
result = adapter.GetRemoteServiceHandles('00:17:B0:A0:E7:09', 'opp')
result2 = adapter.GetRemoteServiceRecord('00:17:B0:A0:E7:09', result[0])
Now 'result2' is basically that byte array, Unfortunately the API doesn't
give any more information other than that the function returns a array{byte}
so I can't really shed any more light on that however if I can just get it
to output all the elements from that array then I will know which one it is
I'm looking for.
I tried to implement your suggestions below as they look pretty safe, but I
couldn't get it to work, my syntax is pretty confused as I'm so new to the
language. Like I say, there is only one element of the array I'm interested
in, I just need to see them all before I know which it is.
Thanks again Steve,
Rob
From: Steven Howe [mailto:[EMAIL PROTECTED]
Sent: 19 April 2007 16:51
To: Robert Rawlins - Think Blue
Cc: python-list@python.org
Subject: Re: Byte-Array to String
Robert Rawlins - Think Blue wrote:
Hello Guys,
I have a byte array passed to me by dbus and I'm looking to convert it into
a string? Is that possible? Sorry for seeming like a putts with these
questions, I'm not used to all these complex data types :-D
The byte array looks something like this when printed to screen.
dbus.Array([dbus.Byte(54), dbus.Byte(0), dbus.Byte(24), dbus.Byte(9),
dbus.Byte(0), dbus.Byte(0), dbus.Byte(10), dbus.Byte(0), dbu
s.Byte(0), dbus.Byte(0), dbus.Byte(0), dbus.Byte(9), dbus.Byte(0),
dbus.Byte(1), dbus.Byte(53), dbus.Byte(3), dbus.Byte(25), dbus.
Byte(16), dbus.Byte(0), dbus.Byte(9), dbus.Byte(2), dbus.Byte(0),
dbus.Byte(53), dbus.Byte(3), dbus.Byte(9), dbus.Byte(1), dbus.By
te(1)], signature=dbus.Signature('y'))
Thanks again,
Rob
When reading about array, I wondered what the hell it was good for. Now I
see. It's a tool to build objects
to pass to the Operating System or other applications. Something like
ctypes. The OS might store data from left to right, or right to left, or not
use IEEE standards (which VMS certainly doesn't). So the data you give/get
from the system call must be massaged by the application before it's usable.
python/lib/module-array.html (5.14 array -- Efficient arrays of numeric
values)
array.tostring( )
Convert the array to an array of machine values and return the string
representation (the same sequence of bytes that would be written to a file
by the tofile() method.)
I wonder if this is the method you are looking for.
So you have an object dbus.Array, which, obviously is from a call to the
dbus (another application's data) that contains 28 byte arrays. I would
assume you know which you want, say the first one.
myDbusString01 = dbus.Array[0].tostring()
or to get the lot:
myDbusStrings = [] #create a new empty list
for array in dbus.Array:
myDbusStrings.append( array.tostring() )
At this point you should have the array converted. But you will still need a
reference as to what you have. The call to the dbus should have some
documentation abut what it's returning.
Also I'd expect the second example to be very bad programming, as some of
the array elements are probably not going to be characters. They could be
integers, floats or booleans. So creating a dictionary to handle specific
array element handling is probably a better, less error prone, method of
attack.
Not have the contents and defination of your dbus.array handy, I can't test
this, but the approach seems reasonable.
Steven Howe
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RE: Byte-Array to String
Thanks for that Carsten, I've given that a go and I still get similar results to what I've seen in the past whereby it prints a couple of elements I would expect to see but other which I'm not sure about, and what seems to be ALOT of blank characters. 6e 555 5 5 5 en j 5 %OBEX Object Push ÿ That's what your suggestion returns to me, I'm using the API to scan a Bluetooth device for services, one of which is OBEX Object Push, but the rest of that output is apparent junk. Unfortunately the API doesn’t really give any suggestions at all, take a look here http://bluez.cvs.sourceforge.net/*checkout*/bluez/utils/hcid/dbus-api.txt if you look down under the 'adapter' section, I'm running the method called GetRemoteServiceRecord() which returns the byte array but there really isn’t any suggestion as to how you extract the information from what's returned. I have no idea if we're barking up the right tree here or if we're going about this the wrong way. Thanks again for all your helps guys, Rob -Original Message- From: Carsten Haese [mailto:[EMAIL PROTECTED] Sent: 20 April 2007 14:00 To: Robert Rawlins - Think Blue Cc: python-list@python.org Subject: RE: Byte-Array to String On Fri, 2007-04-20 at 09:51 +0100, Robert Rawlins - Think Blue wrote: > Morning Steve, > > > > That stuff looks mighty promising, I did play around with the > toString() function yesterday but couldn’t get the damned thing > working. That's because Steven seems to have given you suboptimal advice. The thing you're working with is a dbus.Array of dbus.Byte, not a Python array, so Python's standard array module is not going to help you. When you work with an API function and you don't know what to do with the results of calling that function, the documentation for that API should be your first place to look for help. I don't know what you're referencing, but Google tells me that the python-dbus API is documented here: http://dbus.freedesktop.org/doc/dbus-python/api/ So, what do you do with a dbus.Array full of instances of dbus.Byte? Let's look at their documentation, http://dbus.freedesktop.org/doc/dbus-python/api/dbus.Array-class.html and http://dbus.freedesktop.org/doc/dbus-python/api/dbus.Byte-class.html, respectively. The page about dbus.Array tells us that it inherits from list, so you should be able to do indexed access into it and iterate over it. dbus.Byte inherits from int, and the documentation says that a dbus.Byte can be converted to a character (string of length 1) by calling str or chr on it. So, to get a string from your dbus.Array, you could do something like this: s = "" for b in myDbusArray: s += chr(b) However, it's better (faster) to use the join idiom for building a string char-by-char: s = "".join(chr(b) for b in myDbusArray) That ought to give you the string you're asking for. HTH, Carsten. -- http://mail.python.org/mailman/listinfo/python-list
Schedule Task
Hello Guys,
I've got a method in my app that I want to run every 20 minutes that the
application it running, what's the best way of achieving this? At the moment
I'm using this kind of method.
import sched
import time, sys
scheduler = sched.scheduler(time.time, time.sleep)
scheduler.enter(1.0, 0, sys.stdout.write, ("one\n",))
scheduler.run()
Now when the function runs after 20 minutes I just have it schedule itself
to run again in 20 minutes time, which seems to work for me quite nicely, it
just seems a little 'hacky' to keep the task reoccurring like that.
Is there any other method? I've spent some time on Google but couldn't
really find anything. Not sure if it makes any difference but I'm running
Linux.
Thanks,
Rob
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Class Not Auto-Init On Import
Hello Guys,
>From my understanding of what I've read, the 'import' is meant to auto Init
my class ready for me to access its methods, but it doesn't appear too, I'm
having to init them myself before I can access them, like this.
import LocationService
Location = LocationService.LocationService()
LocationService.setIP('192.168.1.1')
Why is this the case? Should i not just be able to access the setIP() method
by doing LocationService.setIP('192.168.1.1') Without having to create my
own inited reference?
Thanks,
Rob
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Styled Output
Chaps, Hope you're all having a good weekend, I'm sure it'll only be the more 'hard core' of you reading this, anyone with any sanity would be out in the sunshine right now. I'm running a program of mine from Linux bash script and it currently outputs status messages to the command prompt, but they all look a little boring to say the least, it'll be like this. Application Started Sucess Application Configured Failed Retry Application Configured Success What I'd ideally like to do it give it a little bit of format, so it perhaps looks something like this. Application Started [Success] Application Configured [Success] And perhaps have the word 'success' in green, or red for 'failed' and things like that, just to make it a little more presentable to the user. Any ideas on the best way to achieve this? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Minidom Help
Hello guys, Not got much experience with working with minidom, but I'm looking to parse this XML and retrieve the 'name' value from the xml. Think Blue 0x1002 1 I've got as far as parsing the XML using self.doc = xml.dom.minidom.parse(self.filepath) but that's as far as I've managed to get. I've spent a little time googling around but it's all double Dutch to me. Any ideas? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
If Dict Contains a particular key
Hello Guys, I'm Looking to build a quick if/else statement that checks a dictionary for a key like follows. If myDict contains ThisKey: Do this... Else Do that... Thats the best way of doing this? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: If Dict Contains a particular key
Thanks guys for this, glad it was so simple. I used mikes solution in the end, and it worked a charm. Thanks again, Rob From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Bentley Sent: 24 April 2007 18:37 To: python-list@python.org Subject: Re: If Dict Contains a particular key On Apr 24, 2007, at 12:28 PM, Robert Rawlins - Think Blue wrote: Hello Guys, I'm Looking to build a quick if/else statement that checks a dictionary for a key like follows. If myDict contains ThisKey: Do this... Else Do that... Thats the best way of doing this? if ThisKey in myDict: pass # do this else: pass # do that -- http://mail.python.org/mailman/listinfo/python-list
If Dict Contains...
Hello Guys, Looking to build a quick if/else statement that checks a dictionary for a key like follows. If myDict contains ThisKey: Do this... Else Do that... Thats the best way of doing this? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
popen2 results
Hello guys, I've recently ported my application from bash to python, however there are still a few bash line utilities I -have- to use in the application as there isn't any alternative available to me. In the old days of bash I would have grep'd the output from these commands to determine the outcome. I'm now using popen2 to run the command which works a charm, but I'm struggling to parse the results of the function, has anyone had any experience with this? I've found a few suggested solutions dotted around, such as this one. import os def filtered(command, source): dest, result = os.popen2(command) dest.write(source) dest.close() try: return result.read() finally: result.close() But to be honest I'm struggling to get it to do anything as it doesn't states what the 'source' object is or should be. Thanks for any help guys, I'm just looking to capture the output from the command and then I can go about a little REGEX on it. Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Now()
Hello Guys, I'm using the following function 'str (now)' to place a date time stamp into a log file, which works fine, however it writes the stamp like this. 2007-04-25 11:06:53.873029 But I need to expel those extra decimal places as they're causing problems with the application that parses the log data, all I need is something like this: 2007-04-25 11:06:53 With time depicted to the nearest second, from my background in ColdFusion development we used to have a datetimeformat() function that I could use as DateTimeFormat(now(), "-mm-dd HH:mm:ss") Which would give the current time a mask. Any equivalent for this in python? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Scheduler Module Help
Hello Guys, I'm using the sched module to create a set of functions that run every 10 or 20 minutes whilst the application is running, however it would seem that the moment I run scheduler.run() it prevents any other operations in my application from running, its sits dormant until it runs the scheduled functions. Any ideas on what might be the root of this issue? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Re-ocurring Events
Hello Chaps, A bit more of a complex one this time, and I thought I'd get your opinions on the best way to achieve this. Basically I'm looking for a way to describe a re-occurring event, like a calendar event or appointment I guess. I'm likely to use an XML file for the definition of the events, but imagine I've got an event that looks something like this. Now what I want to do is be able to build a class which has a function like 'getCurrentEvent()' which will return any events that should be occurring at that time. So if the current system time and date is 2007-01-03 13:00:00 then it will return THAT event to me, but if it was say 2007-01-03 16:00:00 then it would not, as the event isn't 'due' to occur at that time. Make sense? What's the best way of handling this? I'm really a little lost as to how I might get started, checking a static date time isn't a problem, it's when it comes to these re-occurring events that I struggle a little. The idea is that I would have 5 core repetitions, none, daily, weekly, monthly and annually. Or perhaps you guys have a more full proof method of describing the event in the XML? Any suggestions are more than welcome guys, thanks again for all your help recently. Rob -- http://mail.python.org/mailman/listinfo/python-list
RE:: Re-ocurring Events
Thank you guys for your suggestions. I've been having a look at that launchd stuff from apple but couldnt really see how that applies to my requirements. I've been putting some serious thought into how this should work as its essentially the final part of the puzzle for my application, I'll have a fully working model for my application. I've been thinking about the possibility of using a combination of xpath to search the XML with some loops which change the date. As events won't ever be set to start before 01-01-2007 I can set that as the ceiling for my loop. So when I'm searching for weekly events, I 'simply' take today's date and time and loop from now until 01-01-2007 decrementing the date by a week each iteration of the loop and then search the XML for events in that date, make sense? I know that's a fairly intensive way of doing it, but if it works it works. Now, the loop is where I'm really struggling, I've not done any looping with dates, can anyone give me a hand with this? How can I loop back in time from now to beginning of 07 a week at a time? Do we have some form of dateAdd() I can use with a while loop? Perhaps. Date = (now) While date > 2007-01-01: Date = dateAdd(date, -1, w) Something to that effect? Then I can quickly xpath for every iteration of the loop. Thanks guys for any help. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Laurent Pointal Sent: 26 April 2007 15:33 To: python-list@python.org Subject: Re: Re-ocurring Events Daniel Nogradi a écrit : >> A bit more of a complex one this time, and I thought I'd get your >> opinions >> on the best way to achieve this. Basically I'm looking for a way to >> describe >> a re-occurring event, like a calendar event or appointment I guess. I'm >> likely to use an XML file for the definition of the events, but >> imagine I've >> got an event that looks something like this. >> >> > repeat="daily" >> /> May take a look at launchd (Apple) XML dialect, it may have at least the semantic for your need. For other parts... elementtree, yes. >> Now what I want to do is be able to build a class which has a function >> like >> 'getCurrentEvent()' which will return any events that should be >> occurring at >> that time. So if the current system time and date is 2007-01-03 13:00:00 >> then it will return THAT event to me, but if it was say 2007-01-03 >> 16:00:00 >> then it would not, as the event isn't 'due' to occur at that time. Make >> sense? >> >> What's the best way of handling this? I'm really a little lost as to >> how I >> might get started, checking a static date time isn't a problem, it's >> when it >> comes to these re-occurring events that I struggle a little. The idea is >> that I would have 5 core repetitions, none, daily, weekly, monthly and >> annually. > > This will not solve all your problems, but a very convenient way of > handling XML is the element tree module (that comes with python 2.5): > http://docs.python.org/lib/module-xml.etree.ElementTree.html > > HTH, > Daniel -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
RE: : Re-ocurring Events
Just as another quick update, I've found this module for python that may be able to help me, its designed to spot date patterns for things like recurring events I guess, http://www.biostat.wisc.edu/~annis/creations/period.py.html Quite how I can integrate it into my project I'm not sure but if I can loop through each of the events in my XML and see if they are meant to be recurring today then that's fantastic. If anyone has any rough ideas on how this might work for me I'd love to hear some rough concepts. Thanks, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Rawlins - Think Blue Sent: 27 April 2007 08:24 To: python-list@python.org Subject: RE:: Re-ocurring Events Thank you guys for your suggestions. I've been having a look at that launchd stuff from apple but couldnt really see how that applies to my requirements. I've been putting some serious thought into how this should work as its essentially the final part of the puzzle for my application, I'll have a fully working model for my application. I've been thinking about the possibility of using a combination of xpath to search the XML with some loops which change the date. As events won't ever be set to start before 01-01-2007 I can set that as the ceiling for my loop. So when I'm searching for weekly events, I 'simply' take today's date and time and loop from now until 01-01-2007 decrementing the date by a week each iteration of the loop and then search the XML for events in that date, make sense? I know that's a fairly intensive way of doing it, but if it works it works. Now, the loop is where I'm really struggling, I've not done any looping with dates, can anyone give me a hand with this? How can I loop back in time from now to beginning of 07 a week at a time? Do we have some form of dateAdd() I can use with a while loop? Perhaps. Date = (now) While date > 2007-01-01: Date = dateAdd(date, -1, w) Something to that effect? Then I can quickly xpath for every iteration of the loop. Thanks guys for any help. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Laurent Pointal Sent: 26 April 2007 15:33 To: python-list@python.org Subject: Re: Re-ocurring Events Daniel Nogradi a écrit : >> A bit more of a complex one this time, and I thought I'd get your >> opinions >> on the best way to achieve this. Basically I'm looking for a way to >> describe >> a re-occurring event, like a calendar event or appointment I guess. I'm >> likely to use an XML file for the definition of the events, but >> imagine I've >> got an event that looks something like this. >> >> > repeat="daily" >> /> May take a look at launchd (Apple) XML dialect, it may have at least the semantic for your need. For other parts... elementtree, yes. >> Now what I want to do is be able to build a class which has a function >> like >> 'getCurrentEvent()' which will return any events that should be >> occurring at >> that time. So if the current system time and date is 2007-01-03 13:00:00 >> then it will return THAT event to me, but if it was say 2007-01-03 >> 16:00:00 >> then it would not, as the event isn't 'due' to occur at that time. Make >> sense? >> >> What's the best way of handling this? I'm really a little lost as to >> how I >> might get started, checking a static date time isn't a problem, it's >> when it >> comes to these re-occurring events that I struggle a little. The idea is >> that I would have 5 core repetitions, none, daily, weekly, monthly and >> annually. > > This will not solve all your problems, but a very convenient way of > handling XML is the element tree module (that comes with python 2.5): > http://docs.python.org/lib/module-xml.etree.ElementTree.html > > HTH, > Daniel -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
RE: Re-ocurring Events
Thanks for getting back to me Laurent. I've now made some pretty tidy progress on this and -think- it's going to shape up nicely, I'm just working on converting my date strings from the XML into a date_struct and we should be good to go. I'll keep you all posted. Rob -Original Message- From: Laurent Pointal [mailto:[EMAIL PROTECTED] Sent: 27 April 2007 09:49 To: Robert Rawlins - Think Blue Subject: Re: Re-ocurring Events Robert Rawlins - Think Blue a écrit : > Thank you guys for your suggestions. > > I've been having a look at that launchd stuff from apple but couldnt really > see how that applies to my requirements. I was not thinking about launchd itself, but about its XML configuration files which manage timed events, as you need. > I've been putting some serious thought into how this should work as its > essentially the final part of the puzzle for my application, I'll have a > fully working model for my application. > > I've been thinking about the possibility of using a combination of xpath to > search the XML with some loops which change the date. As events won't ever > be set to start before 01-01-2007 I can set that as the ceiling for my loop. > So when I'm searching for weekly events, I 'simply' take today's date and > time and loop from now until 01-01-2007 decrementing the date by a week each > iteration of the loop and then search the XML for events in that date, make > sense? > > I know that's a fairly intensive way of doing it, but if it works it works. > > Now, the loop is where I'm really struggling, I've not done any looping with > dates, can anyone give me a hand with this? How can I loop back in time from > now to beginning of 07 a week at a time? Do we have some form of dateAdd() I > can use with a while loop? Perhaps. See datetime module, eventually third party mxDatetime. > Date = (now) > While date > 2007-01-01: > Date = dateAdd(date, -1, w) > > Something to that effect? Then I can quickly xpath for every iteration of > the loop. A+ Laurent. -- Laurent POINTAL CNRS-LIMSI dépt. CHM, groupes AMI et PS Courriel: [EMAIL PROTECTED](prof) [EMAIL PROTECTED] (perso) Ouebe: http://www.limsi.fr/Individu/pointal/ Tél. 01 69 85 81 06 (prof) Fax. 01 69 85 80 88 -- http://mail.python.org/mailman/listinfo/python-list
RE: Re-ocurring Events
Ok, Almost done now, it seems to be working a real charm at the moment.
I need a little help on performing a quick if statement against a date
string. I have couple of date strings returned by
s.attributes.getNamedItem("start").nodeValue
s.attributes.getNamedItem("end").nodeValue
and I need to do and conditional that ensures start is before today's
date/time and end is after today's date/time.
The string looks like: '2007-01-01 00:00:00'
Do I have to convert this to a proper time object to do the comparison? Or
can I do it as a string?
Thanks,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Robert Rawlins - Think Blue
Sent: 27 April 2007 09:55
To: 'Laurent Pointal'
Cc: python-list@python.org
Subject: RE: Re-ocurring Events
Thanks for getting back to me Laurent.
I've now made some pretty tidy progress on this and -think- it's going to
shape up nicely, I'm just working on converting my date strings from the XML
into a date_struct and we should be good to go.
I'll keep you all posted.
Rob
-Original Message-
From: Laurent Pointal [mailto:[EMAIL PROTECTED]
Sent: 27 April 2007 09:49
To: Robert Rawlins - Think Blue
Subject: Re: Re-ocurring Events
Robert Rawlins - Think Blue a écrit :
> Thank you guys for your suggestions.
>
> I've been having a look at that launchd stuff from apple but couldnt
really
> see how that applies to my requirements.
I was not thinking about launchd itself, but about its XML configuration
files which manage timed events, as you need.
> I've been putting some serious thought into how this should work as its
> essentially the final part of the puzzle for my application, I'll have a
> fully working model for my application.
>
> I've been thinking about the possibility of using a combination of xpath
to
> search the XML with some loops which change the date. As events won't ever
> be set to start before 01-01-2007 I can set that as the ceiling for my
loop.
> So when I'm searching for weekly events, I 'simply' take today's date and
> time and loop from now until 01-01-2007 decrementing the date by a week
each
> iteration of the loop and then search the XML for events in that date,
make
> sense?
>
> I know that's a fairly intensive way of doing it, but if it works it
works.
>
> Now, the loop is where I'm really struggling, I've not done any looping
with
> dates, can anyone give me a hand with this? How can I loop back in time
from
> now to beginning of 07 a week at a time? Do we have some form of dateAdd()
I
> can use with a while loop? Perhaps.
See datetime module, eventually third party mxDatetime.
> Date = (now)
> While date > 2007-01-01:
> Date = dateAdd(date, -1, w)
>
> Something to that effect? Then I can quickly xpath for every iteration of
> the loop.
A+
Laurent.
--
Laurent POINTAL
CNRS-LIMSI dépt. CHM, groupes AMI et PS
Courriel: [EMAIL PROTECTED](prof)
[EMAIL PROTECTED] (perso)
Ouebe: http://www.limsi.fr/Individu/pointal/
Tél. 01 69 85 81 06 (prof)
Fax. 01 69 85 80 88
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RE: what python technology for my app?
Just thought I'd make a little suggestion about this, I dont know how strict you want to be with the web development side of things, but I'm a web developer by trade and have recently started using python for my non-web type applications. If you're looking for a web based server side solution, then you can't go wrong with Adobe ColdFusion. Its and incredibly powerful and scalable development platform and yet supports a simple tag based language which makes life very easy when getting started, and yet will support much more complex OOP methodology with a whole myriad of frameworks, orm's and object factories. For a quick 'run down' of its features take a look at the simple tutorials on the adobe site, they'll demonstrate how easy it is to achieve even quite complex tasks like PDF creation, animated statistical charts an all sorts. As CF is a JAVA based technology you get the power of J2EE platform and its perfectly multi platform playing nicely with linux, unix, sun, windows or whatever server environment you wish to run it on. Just my two pence, I'm a big CF fan so my opinions are no doubt bias, but might be worth you taking a look. http://www.adobe.com/uk/products/coldfusion/ Pay attention to the 'ColdFusion Demos' at the bottom right of the main column. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bruno Desthuilliers Sent: 27 April 2007 12:19 To: python-list@python.org Subject: Re: what python technology for my app? Chris a écrit : > I have an database containing lots of numerical data. I want to write a > browser based interface that will allow selection of various key > parameters and yield tables, plots and/or printouts of the data > according to the selections. Ultimately I want this to run on an > intranet so that others can get access via their browsers. > > The application is for in-house use only and not likely to have more > than a few users at any one time. I've managed to hack out enough > understanding of sql and sqlAlchemy over the last couple of days to > create and access an sqlite3 based database for my data. This seems to > suit my purposes for now. Now for a front end and some simple > distribution over a network. > > I have written some small Wxpython & matplotlib apps for data analysis > and display but I'm not sure how these would work in a browser based > world, or even if they are appropriate. wxPython being a GUI toolkit, it's of course not really appropriate for a web-based solution (and yes, this is an understatement). I don't have any experience with matplotlib, but according to the project's FAQ, this shouldn't be a problem: http://matplotlib.sourceforge.net/faq.html#BATCHMODE > > Any advice on what technologies I should be looking at for this? Python > based naturally, and hopefully simple and lightweight. I'm not a > programmer by trade and that's not what I really get paid for but I've > learned to love python and its myriad of modules for all the data > analysis work I need to do. If I can throw something moderately > functional together in a week or two (along with all the learning that > entails) If you don't have any experience with web programming, it might take a bit more time. > I'll be happy. Pylons (http://pylonshq.com) and turbogears are two great web frameworks. Both support SQLAlchemy. My own favourite is Pylons, but you should try both and choose the one that better fits your brain. > btw - Platform needs to be windows because that's what on my desk. Python is mostly platform independant. HTH -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
RE: Re-ocurring Events
Thanks for that tip Jarek, It worked a charm, I just created a format time string and used that in the compare against my XML and it work perfectly. Thank you, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jarek Zgoda Sent: 27 April 2007 13:01 To: python-list@python.org Subject: Re: Re-ocurring Events Robert Rawlins - Think Blue napisał(a): > and I need to do and conditional that ensures start is before today's > date/time and end is after today's date/time. > > The string looks like: '2007-01-01 00:00:00' > > Do I have to convert this to a proper time object to do the comparison? Or > can I do it as a string? In the very specific case of string formatted as above, the string comparison will give the same results as in the case of datetime objects comparison. You just have to compare the same kinds of things. ;) -- Jarek Zgoda "We read Knuth so you don't have to." -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
RE: what python technology for my app?
Haha, no Troll, just a shameless plug for my life's one true love ;-) Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bruno Desthuilliers Sent: 27 April 2007 14:35 To: python-list@python.org Subject: Re: what python technology for my app? Robert Rawlins - Think Blue a écrit : > Just thought I'd make a little suggestion about this, I dont know how > strict you want to be with the web development side of things, but I'm a web > developer by trade and have recently started using python for my non-web > type applications. > > If you're looking for a web based server side solution, then you can't go > wrong with Adobe ColdFusion. Err... is this a troll ? -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Dict Copy & Compare
Hello Guys, I'm looking for a little advice on dicts, firstly I need to learn how to copy a dict, I suppose I could just something like. Self.newdict = self.olddict But I fear that this only creates a reference rather than an actual copy, this means that as soon as I clear out the old one, the new one will effectively be empty. What's the best way to ACTUALY copy a dict into a new variable? Next up I'm looking to compare two different dictionaries, then loop through the unique results that are in each and print them out. Is there a more efficient way of doing this other than a loop with an if/else statement? For a in self.dict1: If a not in self.dict2: Print 'Found %s' % (a) For b in self.dict2: If b not in self.dict1: Print 'Found %s' % (b) That would firstly loop through the first dict and output any of its unique values, it then loops through the second dict and output any of its unique values, is this the best way of doing this? Or is there something more efficient? Thanks, Rob Rawlins -- http://mail.python.org/mailman/listinfo/python-list
RE: Dict Copy & Compare
Thanks for that Tim, The first part for copying the dict seems to work nicely but I'm struggling to get the second part working properly. Let me explain a little more specifically what I'm trying to do. I have two dicts, one named 'this' and the other named 'that'. I want to get all the unique keys from 'this' and log them into a file, I then want to take all the unique values from 'that' and log them into a separate file. I have functions set up for the logging, so I can call it like logThis(uniquekey) and logThat(uniquekey). So it's just a case of firstly returning a list of all keys that are in 'this' but NOT in 'that' and then visa versa, then loop over them performing the function. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Golden Sent: 30 April 2007 09:41 Cc: python-list@python.org Subject: Re: Dict Copy & Compare Robert Rawlins - Think Blue wrote: > I'm looking for a little advice on dicts, firstly I need to learn how to > copy a dict, I suppose I could just something like. > Self.newdict = self.olddict > But I fear that this only creates a reference rather than an actual copy, > this means that as soon as I clear out the old one, the new one will > effectively be empty. What's the best way to ACTUALY copy a dict into a new > variable? Unless you have specialised needs, you can just say: d2 = dict (d1) which will initialise d2 from d1's key/value pairs: d1 = dict (a=1, b=2) d2 = dict (d1) d2['a'] = 5 print d1 print d2 > Next up I'm looking to compare two different dictionaries, then loop through > the unique results that are in each and print them out. Is there a more > efficient way of doing this other than a loop with an if/else statement? This comes up not infrequently on the list. I think there's even a few recipes in the cookbook. One (fairly recent) technique is to use set versions of your dictionary keys, but it depends on what you want to do next. From my example above: # relies on the fact that dictionary iterators # iterate over the keys of the dict. s1 = set (d1) s2 = set (d2) # do whatever set-ops you want, eg s3 = s1 | s2 for key in s3: print "Key:", key print "d1 =>", d1[key] print "d2 =>", d2[key] TJG -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
RE: Dict Copy & Compare
Hello Tim,
Sorry, that 'value' was a slip up on my part, we're just dealing with keys
here.
I get that a dict stores unique keys only but we're comparing the two dicts,
so when I say 'unique keys in dict 1' I basically mean all those keys that
are in dict one but not in dict 2. So imagine my 2 dicts with the following
keys.
Dict 1 Dict 2
-- ---
00:00:00:00 00:00:00:00
11:11:11:11 11:11:11:11
22:22:22:22 33:33:33:33
44:44:44:44 44:44:44:44
55:55:55:55
Now, 22:22:22:22 and 55:55:55:55 is unique to dict one, and 33:33:33:33 is
unique to dict 2, does that make sense? Sorry for not explaining this stuff
very well, being so new to dicts its easy to get confused with my terms.
I then want to pass those keys as a string value into my function as an
argument, like.
thisFunction('22:22:22:22')
thisFunction('55:55:55:55')
thatFunction('33:33:33:33')
I'm hoping that your method will work for me, I've just got to spend my time
understanding what each step of it does.
Thanks again for all your help Tim,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Tim Golden
Sent: 30 April 2007 10:15
Cc: python-list@python.org
Subject: Re: Dict Copy & Compare
Robert Rawlins - Think Blue wrote:
> I have two dicts, one named 'this' and the other named 'that'.
>
> I want to get all the unique keys from 'this' and log them into a file, I
> then want to take all the unique values from 'that' and log them into a
> separate file.
Couple of points which are confusing me:
1) Any dict can *only* have unique keys, ie you can't have
a key appearing more than once in a dictionary by
definition.
2) You speak of unique keys in "this" but unique values
in "that". Is that deliberate on your part? Might be, but
I'm not quite clear.
> I have functions set up for the logging, so I can call it like
> logThis(uniquekey) and logThat(uniquekey).
Here you refer to "uniquekey" in both cases, so maybe a
mistake above?
> So it's just a case of firstly returning a list of all keys that are in
> 'this' but NOT in 'that' and then visa versa, then loop over them
performing
> the function.
OK, well following by example earlier:
d1 = dict (a=1, b=2, c=3)
d2 = dict (b=4, c=5, d=6)
s1 = set (d1) # => set of 'a', 'b', 'c'
s2 = set (d2) # => set of 'b', 'c', 'd'
s1_not_in_s2 = s1 - s2 # => set of 'a'
s2_not_in_s1 = s2 - s1 # => set of 'd'
for key in s1_not_in_s2:
print key, "=>", d1[key]
for key in s2_not_in_s1:
print key, "=>", d2[key]
Obviously there are more concise ways of representing
this; I'm just spelling the whole thing out to make it
clearer (I hope). If this approach seems fruitful, have
a look at the set typeit's a recentish addition to
Python but very useful for this kind of thing:
http://docs.python.org/lib/types-set.html
TJG
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RE: Dict Copy & Compare
Thanks for that Tim,
Don't feel guilty mate, I've learned a little something from you anyway,
whether its applied here or not.
On quick question, how can I order a dict by the 'values' (not keys) before
looping? Is that possible?
Thanks,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Tim Golden
Sent: 30 April 2007 11:27
Cc: python-list@python.org
Subject: Re: Dict Copy & Compare
Robert Rawlins - Think Blue wrote:
> Hello Tim,
>
> Sorry, that 'value' was a slip up on my part, we're just dealing with keys
> here.
>
> I get that a dict stores unique keys only but we're comparing the two
dicts,
> so when I say 'unique keys in dict 1' I basically mean all those keys that
> are in dict one but not in dict 2. So imagine my 2 dicts with the
following
> keys.
>
> Dict 1Dict 2
> -----
> 00:00:00:00 00:00:00:00
> 11:11:11:11 11:11:11:11
> 22:22:22:22 33:33:33:33
> 44:44:44:44 44:44:44:44
> 55:55:55:55
>
> Now, 22:22:22:22 and 55:55:55:55 is unique to dict one, and 33:33:33:33 is
> unique to dict 2, does that make sense? Sorry for not explaining this
stuff
> very well, being so new to dicts its easy to get confused with my terms.
>
> I then want to pass those keys as a string value into my function as an
> argument, like.
>
> thisFunction('22:22:22:22')
> thisFunction('55:55:55:55')
>
> thatFunction('33:33:33:33')
>
> I'm hoping that your method will work for me, I've just got to spend my
time
> understanding what each step of it does.
Well I feel a bit guilty now I look back at your
original post, because I've probably given
you a more complex solution than you really need. Your
initial approach is probably quite adequate. Python
dicts are highly tuned beasts so unless you're doing
something really big or bizarre, you can sensibly do:
d1 = {
"00:00:00:00" : None,
"11:11:11:11" : None,
"22:22:22:22" : None,
"44:44:44:44" : None,
"55:55:55:55" : None
}
d2 = {
"00:00:00:00" : None,
"11:11:11:11" : None,
"33:33:33:33" : None,
"44:44:44:44" : None
}
for k in d1:
if d1 not in d2:
thisFunction (d1)
for k in d2
if d2 not in d1:
thatFunction (k)
But even if this is adequate for your purposes,
it's always good to be aware of what's in your
programming toolbox and there's always the danger
you'll end up implementing sets in dicts (which
is what everyone did before Python 2.3).
TJG
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RE: Dict Copy & Compare
No that makes sense Tim,
Thanks again for all your help on this one, it'll all prove invaluable I'm
sure. I managed to crack all the big troubles last week with my reoccurring
tasks, it's just a case of tidying up a few of these loose ends, then
that'll be python project no.1 over and done with :-D
Thanks,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Tim Golden
Sent: 30 April 2007 12:54
Cc: python-list@python.org
Subject: Re: Dict Copy & Compare
Robert Rawlins - Think Blue wrote:
> On[e] quick question, how can I order a dict by
> the 'values' (not keys) before looping? Is that possible?
Depends on what you want to do. You can loop on
the sorted values very easily:
d1 = dict (a=2, b=1)
for value in sorted (d1.values):
print value
but inferring the equivalent key is, in effect,
not possible since more than one key might correspond
to that value. Depending on what you're after, the
following technique might be of use:
import operator
d = dict (a=2, b=1, c=-1, d=4)
for k, v in sorted (
d.items (),
key=operator.itemgetter (1)
):
print k, "=>", v
It may look a bit hairy, but break it down:
d.items () returns a list of 2-tuples, each one
corresponding to a key-value pair from the dict.
In our case, that'll be:
[('a', 2), ('b', 1), ('c', -1), ('d', 4)]
Although I've written them out like that,
the order they'll come in is undefined.
sorted () will return a sorted version of
whatever iterable you chuck at it. Under
normal Python semantics, sorted() on the
list above will return no change since I've
listed things out in alphanumeric order.
The extra key= parameter tells the sorted
routine to call the function you provide
against each of the items in the list (in
our case that means against each of the
2-tuples) and using the result of that
function as the sorting order.
The operation.itemgetter (1) bit is a touch
complicated unless you're already familiar with
partial functions, but it basically returns
*another* function which takes the item you
give it and returns the -- in this case --
1st item. Just believe me: it works.
So, in summary:
+ Get a list of key-value pairs
+ Sort them according to the 1st item (Python-style)
which in this case is the value.
+ Do something with the result
Before the key= param was introduced into
sort/sorted, people used to do the same thing
with what's often called DSU (short for
decorate-sort-undecorate), a technique which
here would look something like this:
items = d.items ()
sortable_items = [(i[1], i) for i in items]
sortable_items.sort ()
sorted_items = [i[-1] for i in sortable_items]
I mention this because (a) you still see it around
a fair bit and (b) there are occasions where it's
still useful, for example where a simple function
call can't really cope.
(Did I answer the question, or was I just rambling?)
TJG
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Killing Threads
Hello Guys, I've got an application which I've fearfully placed a couple of threads into however when these threads are running it seems as if I try and quite the application from the bash prompt it just seems to freeze the SSH client. I've also seen that if I have my app running in the background on the system then my 'reboot' no longer works, it just hangs after saying it's going to shut down. Is there anything specific i should be doing to kill my threads? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: test
Test response :-D -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ray Sent: 02 May 2007 04:05 To: python-list@python.org Subject: test test only -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Dynamic File Name Open()
Chaps, I'm trying to open a file using open() but the name of the file is created dynamically as a variable, but also has part of a static path. For instance, the file may be called 'dave' and will always be in '/my/files/here/'. Now I've tried a few combinations of getting this to work, such as. Path = '/my/files/here/%s' % (name) Open(Path, 'r') But that does work, can anyone enlighten me on the best way to do this? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: Killing Threads
Thanks for this Diez and Tim, I'll take a look into this today, sorry for not posting any code fragments, its not so much a fragment as it is a bloody great big monster :-D Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Diez B. Roggisch Sent: 02 May 2007 09:05 To: python-list@python.org Subject: Re: Killing Threads > You probably need to setDaemon (True) on your threads > after you've created them and before they run. That > tells the OS: don't bother waiting for these ones to > finish if the program exits. (At least I think that's > what it does; I don't use threads all that much) Actually all it does is to tell the at_exit-handler that it's ok to terminate even though there are still some threads. The OS isn't concerned with this. Diez -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Spotting Crashed Application
Hello Guys, I've got an application that I've written, and it sits in an embedded system, from time to time the application will crash, I'm not quite sure what's causing this, but as we test it more and more we'll grasp a better understanding and fix the issues. However, until then I need a quick solution which can spot the crash and reboot the system. Is there any generic way of writing a separate application that'll spot the crash in my main application? If not then i was thinking about having my core application log itself as 'alive' every 5 minutes or so. My new 'spotter' application can check this log, if it's not been written too in say 6 minutes then the main app must have crashed, and it can reboot. Any suggestions on how best to handle this? Obviously finding the bug in my main app is paramount, but a failsafe will never hurt. Thanks again guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Code Explanation
Hello Guys,
I'm currently working on a non-python project, and I'm trying to overcome a
task of parsing a text file into a database and/or xml file. I've managed to
find a parser example written in python, and I'm hoping to deconstruct the
code methodology a bit so I can write it in another language. So I'm hoping
someone can explain to me what these following bits of code are doing.
lines = range(data.count("\n"))
lined_data = data.split("\n")
print "Read %i vendors, now processing" % data.count("(hex)")
I've not used the split() function before, but it partly makes sense to me.
What is that piece of code doing? 'Data' is the content of the text file,
presumably the first line there is counting the number of lines in the file,
but I don't get the rest of it.
The rest of the code seems like a relatively simple set of loops, but it's
just this splitting stuff that's got me confused.
Thanks,
Rob
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App Leaving 'sh ' Everywhere
Hello Guys, I've got an application that seems to leave 'sh ' in my os processes list. I'm running it on Debian, albeit a stripped down embedded version. I'm not sure what the cause of this is, My application starts several threads and also uses popen2.popen3() to run a few CMD commands. Any ideas why I'm getting this, or if it's even something to be concerned about. Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
SOAPpy My Class
Hello Chaps, I've used SOAPpy in its very basic form for consuming web services on my web server, but I'm now looking to publish a web service from my application. Basically I'm looking to create a public 'proxy' of an object I have in the application. The idea being that my application will be able to use the instance of the object, and other applications will also be able to access this same object, using the web service. I've got my object built, and it has a few basic functions inside of it, most of them just serving as wrappers for other simple python functions, working on dicts and lists. What's the best way to go about publishing a web service that calls on that instance? I've done simple publishing of services in a standard script before, but I've not worked on this idea of publishing a public facade for an existing class. Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Restart Linux System
Hello Guys, I'm looking to restart a Linux system from my python application. What's the best way to achieve this, is there something in the OS module? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Shared Memory Space - Accross Apps & Network
Hello Guys, I've got an application that runs on an embedded system, the application uses a whole bunch or dicts and other data types to store state and other important information. I'm looking to build a small network of these embedded systems, and I'd love to have them all share the same set or data. Is it possible to share the applications variables across multiple applications, so certain lists are like a 'pool' written to by the different systems? I'm sure I could cobble something together by writing the lists to shared files instead of keeping them in RAM, but that feels a little inefficient. I'd like to try and configure some form of master/slave relationship between my applications if possible. Thanks for any ideas you guys might have. Rob -- http://mail.python.org/mailman/listinfo/python-list
File Handling & TRY/EXCEPT
Hello Guys,
I'm looking for some advice on how best to handle file read/write errors
with try/except as i'm a little vague on this, I have a small memory leak in
my app and I'm starting to think its generated by my log file write. For an
example of the function look below.
def addAppLog(self, event):
try:
logfile = open('/pblue/new/Logs/Application.csv','a')
now = datetime.datetime.now()
logstring = '%s,%s \n' % (event, str(now))
logfile.write(logstring)
except:
self.addAppLog(event)
else:
logfile.close()
Now I'm looking for some help to sort this out as I'm sure it's pretty
untidy, I want to make it as air tight as possible. The basic concept was
that if it tries writing to the log file and it fails, then it needs to
reattempt it, right?
What's the best way to handle this to ensure that there are not any memory
leaks caused when the file is open() but not followed by a close(). I'm
running 2.4 and I know some of these newer versions don't need you to
explicitly close() the file objects, but I would certainly feel a lot
better.
Any advice?
Thanks guys,
Rob
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RE: File Handling & TRY/EXCEPT
Thanks for your ideas guys,
I'm unfortunately tied to 2.4 so don't have the full try except status, but
I'm now working with the following code:
def addApp(self, event):
try:
logfile =
open('/pblue/new/Logs/Application.csv','a')
now = datetime.datetime.now()
logstring = '%s,%s \n' % (event, str(now))
try:
logfile.write(logstring)
finally:
logfile.close()
except:
self.addApp(event)
I'm trying to slowly debug my app and get rid of all the memory leaks, but
its pain staking work, any help you can offer on that stuff would be a god
send, I'm a little reluctant about posting all my app code on the lists as
I'd like to keep some of it private.
How does that new version look? A little tidier?
Thanks guys,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Steve Holden
Sent: 03 August 2007 14:20
To: python-list@python.org
Subject: Re: File Handling & TRY/EXCEPT
Robert Rawlins - Think Blue wrote:
> Hello Guys,
>
>
>
> I'm looking for some advice on how best to handle file read/write errors
> with try/except as i'm a little vague on this, I have a small memory
> leak in my app and I'm starting to think its generated by my log file
> write. For an example of the function look below.
>
>
>
>def addAppLog(self, event):
> try:
> logfile = open('/pblue/new/Logs/Application.csv','a')
> now = datetime.datetime.now()
> logstring = '%s,%s \n' % (event, str(now))
> logfile.write(logstring)
> except:
> self.addAppLog(event)
>
It seems somewhat perverse, when the logging code raises an exception,
to recursively log - presumably the same exception will be raised again?
> else:
>
> logfile.close()
>
Remember that in 2.5 you can use try ... except ... finally
>
> Now I'm looking for some help to sort this out as I'm sure it's pretty
> untidy, I want to make it as air tight as possible. The basic concept
> was that if it tries writing to the log file and it fails, then it needs
> to reattempt it, right?
>
Wrong. The one thing you can't log is a logging attempt error!
>
>
> What's the best way to handle this to ensure that there are not any
> memory leaks caused when the file is open() but not followed by a
> close(). I'm running 2.4 and I know some of these newer versions don't
> need you to explicitly close() the file objects, but I would certainly
> feel a lot better.
>
>
>
> Any advice?
>
This is just a quick on-the-fly look at what you did, I am sure you will
receive other, probably more helpful, comments.
regards
Steve
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RE: Replacing _xmlplus.dom.minidom with xml.dom.minidom
Just as a heads up, minidom is pretty inefficient and difficult to work with too. On someone else's advice I switched over to ElementTree and have been really pleased with the results, its much simpler to work with and more efficient too. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: 03 August 2007 14:39 To: python-list@python.org Subject: Replacing _xmlplus.dom.minidom with xml.dom.minidom Hi, I'm working with a number of scripts which were written years ago for my company for Python 2.2, and I'd like to update for Python 2.5. I have written a script to add # -*- coding: cp1252 -*- to the beginning of all my scripts, and that has fixed the encoding issues. Another issue was the use of - from _xmlplus.dom import minidom http://sourceforge.net/project/showfiles.php?group_id=6473 I couldn't get a version of this module for 2.5, so I changed the above to - from xml.dom import minidom The scripts I work with are all working now correctly for 2.5. But I haven't been able to test the whole system as not all of it concerns me. Anyway, my colleges are interested in updating also if it will be reasonably hassle free. So my main concern now is the use of _xmlplus.dom.minidom. Why was it used and what differences should I look out for with regard to xml.dom.mididom Thanks very much for your help, Barry. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Devloper Wanted For Debugging / Optimizing
Hello Chaps, I've been writing (with your help) a small application over the past couple of months but I'm really struggling to iron out all of the creases and its seems to spring a few memory leaks that I'm unable to find and plug. It's only a small app, around 500 lines of code I would guess, aside from the usual python type things it deals with dbus and XML parsing using element tree, But it's for an embedded Linux platform so keeping it lightweight and memory leak free is an absolute must. Is anyone interested to take this small project on to have a look at my code? Perhaps give me a little bit of advice on where I'm going wrong? I would be willing to pay someone for their much needed time to get the final few creases ironed out, this isn't really stuff we can deal with on the boards so something private is a must, hence I'm exploring the idea of a paid contract. If anyone is interested then please feel free to contact me off list. Thanks again guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Launching App
Hello Guys, I'm looking for the best method to launch my python app when my Linux system boots up. At the moment I just have an entry like this in my rc.local file: CD /myfolder/anotherfolder ./myapp.py Is this the best way to do this? Or is there a better way? I feel like a bit of a dummy asking this question, I just wanted to ensure the best method. Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
SOAP Webservices and Python
Hello Chaps, I'm pretty new to the world of Python, but I'm slowly getting my head around things, and on today's agenda I'm looking at consuming SOAP web services. I've got an Adobe ColdFusion application which I've written that publishes the web service that I'm looking to consume, but I'm at a loss as to where to start. I'm running Python 2.4.4 on a Debian Linux distribution, in case that makes any difference. I thought I'd start with something very simple, just a service I pass an ID to and it'll return a Boolean value. Here is the web service link. http://www.yourblue.co.uk/webservicetester/ip.cfc?wsdl I'd be interested to hear any thoughts on the best way to go about this, or perhaps some working code examples of consuming this service. I will always have the WSDL file available to me by appending the ?wsdl to the URL, I've heard this makes life easier. like I say, I'm pretty new so it's perfectly ok for you guys to assume I'm an idiot and talk to me as if I were a small child :-D Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Writing XML Logs
Hello Chaps, I'm trying to write an application that will log to an XML file, that'll be later parsed by another application. The proposed log file will look something like this, listing different event elements and then a record for each time that event occurs. What I would really like to do is have a different function for each event, so logReboot() or something like that which can be called when the application starts, and it'll create and entry with the current date and time. This must be a static file that is on the box, allot of the examples I've seen seem to work using the 'print' function which is a little sketchy as outputting to the screen isn't any use to me, this needs to be a file that can be collected by another application. Can anyone offer any advice on how best to get started with this kind of thing? I'm running python 2.4.4 but when I've tried running any examples with SAX involved they seem to say 'no module found: sax" or something to that effect, I was under the impression that sax came bundled with python 2.0 and above? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
SOAPPY Install Issues
Hi Guys,
I've been trying hopelessly -ALL- afternoon to get python-xml and
python-soappy working nicely, but for the -LIFE- of me I keep running into
the same brick wall over and over.
I'm running Debian and I've installed the latest stable builds of Python,
Python-XML and Python-SOAPPY along with all there depensancies but i get the
following error when trying to run my code.
Traceback (most recent call last):
File "xml.py", line 1, in ?
from SOAPpy import SOAPProxy
File "/var/lib/python-support/python2.4/SOAPpy/__init__.py", line 5, in ?
from Client import *
File "/var/lib/python-support/python2.4/SOAPpy/Client.py", line 57, in ?
from Parser import parseSOAPRPC
File "/var/lib/python-support/python2.4/SOAPpy/Parser.py", line 9, in ?
import xml.sax
File "/pblue/xml.py", line 1, in ?
from SOAPpy import SOAPProxy
ImportError: cannot import name SOAPProxy
This is my Code:
from SOAPpy import SOAPProxy
url = 'http://services.xmethods.net:80/soap/servlet/rpcrouter'
namespace = 'urn:xmethods-Temperature'
server = SOAPProxy(url, namespace)
server.getTemp('27502')
It's a very simple program, and its driving me bonkers not being able to get
it working, I'd appreciate any help you can offer to help resolve it.
Thanks guys, I'm sure this is just a typical NOOB mistake, but hopefully
once the damn thing is up and running it'll be clear sailing.
Rob
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Binary To File
Hello Guys, Is there an easy way to take binary data and build it into a file? Generally this will be BLOB data drawn from a database, the data will be for jpg images, I want to take the blob data and build it into a physical .jpg file. Is there a simple function for doing this in python? Like binary2file() or something along those lines? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Arrays, Got Me Confused
Hello Guys, I'm struggling to get my head into arrays in python, I've used them plenty in other languages but I'm struggling to find any decent documentation for them in python. I'm looking to build a list of network MAC address's into an array, which will probably be used for logging and firewalling and things. I've build the basic class, the idea is that the class represents the firewall, and I have functions for the firewall like addDevice() and isFirewalled() where I pass in the address and it returns a value or updates the array. However I'm getting an error when trying to create an empty array on the init. #!/usr/bin/python # Filename: Firewall.py class Firewall: def __init__(self): Self.FireArray = array(c) p = Firewall() print p Throws: Traceback (most recent call last): File "./firewall.py", line 9, in ? p = Firewall() File "./firewall.py", line 7, in __init__ Self.FireArray = array(c) NameError: global name 'array' is not defined How can I solve this problem? From what I've seen writing I can't see anything wrong with my syntax, perhaps you can shed some light on the situation. Whilst I'm writing there is also another question I would like to pose briefly. How do a create an object from an external file? Obviously in my one above all I need do is call Firewall() and it creates an instance, but I'm used to creating my class's as separate files, how do I create them as an object in my main application? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: Arrays, Got Me Confused
Hello Guys, Wider fragments of code don't really exists at this moment in time :-D this is just a bit of a 'tester' class for me to get used to the methods. Basically I'm trying to create a class that contains an array of MAC address, these look something like this 'FD:E4:55:00:FG:A9. I want the class to have the following methods for easy manipulation of the array. addDevice(Address) - Pass in the MAC address and have it add it to the array. removeDevice(Address) - Finds a device with that address in the array and removes it. isFirewalled(Address) - looks for that address in the array and returns true/false dependant on whether it finds it. Clear() - empty the array of all its contents. Sorry for the sloppy code so far, I'm really new to Python so it's a steep learning curve for me, I'm by no means a programming numpty and allot of the principles are the same, but the languages I'm used to are more robust and vague so I don't have to define what type of data i'm storing the array and things. Thanks guys, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Golden Sent: 13 April 2007 13:27 Cc: [EMAIL PROTECTED] Subject: Re: Arrays, Got Me Confused Michael Bentley wrote: > > On Apr 13, 2007, at 7:04 AM, Robert Rawlins - Think Blue wrote: >> #!/usr/bin/python >> >> # Filename: Firewall.py >> class Firewall: >>def __init__(self): >> >> Self.FireArray = array(c) >> >> p = Firewall() >> >> print p >> Throws: >> >> >> >> Traceback (most recent call last): >> >> File "./firewall.py", line 9, in ? >> >> p = Firewall() >> >> File "./firewall.py", line 7, in __init__ >> >> Self.FireArray = array(c) >> >> NameError: global name 'array' is not defined >> >> >> >> How can I solve this problem? > from array import array Well, also the line referencing "Self.FireArray" is not going to work, unless there's some global "Self" knocking around. Python is case-sensitive. More importantly, I suspect, is that the OP's almost certainly looking for a Python *list*, not an array in this case. It's hard to tell, since we've no idea what's in the "c" which is being passed to the array. Robert - can you explain what you're trying to do and/or post a wider fragment of code? TJG -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
RE: Arrays, Got Me Confused
Thanks for that Tim and Steve, greatly appreciated.
I know that the class method is just a wrapper and it seems a little silly,
but it is partly for the exercise. I'm pretty well savvy with the OOP stuff
but its something my business partner is yet to venture into, so by working
like this it helps him understand the concepts. I also feel more at home if
i can wrap this stuff up in nice user friendly methods that I can access
universally throughout the application.
I will have plenty of other class's and methods throughout the application
that will call upon this firewall stuff, and being able to universally
reference it as Firewall.addDevice() makes things more logical in my mind, I
find trying to go back to a more procedural method pretty tricky now.
Thanks again guys,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Tim Golden
Sent: 13 April 2007 14:03
Cc: [EMAIL PROTECTED]
Subject: Re: Arrays, Got Me Confused
Robert Rawlins - Think Blue wrote:
> Hello Guys,
>
> Wider fragments of code don't really exists at this moment in time :-D
this
> is just a bit of a 'tester' class for me to get used to the methods.
> Basically I'm trying to create a class that contains an array of MAC
> address, these look something like this 'FD:E4:55:00:FG:A9. I want the
class
> to have the following methods for easy manipulation of the array.
>
> addDevice(Address) - Pass in the MAC address and have it add it to the
> array.
>
> removeDevice(Address) - Finds a device with that address in the array and
> removes it.
>
> isFirewalled(Address) - looks for that address in the array and returns
> true/false dependant on whether it finds it.
>
> Clear() - empty the array of all its contents.
OK, it's easy enough to do this, but you might find
that you don't actually need to do too much of it
yourself. Python has two central datastructures
built in: lists and dictionaries. There are loads
of tutorials around (and if you join the python-tutor
list, the welcome message points you towards several)
so I won't go into the details, but it looks like
you want a dict here.
You could wrap it in a class if you wanted, but
the great thing about Python is that you don't
have to. *Very* rough example code:
macs = {} # create an empty dict
incoming_mac = 'FD:E4:55:00:FG:A9'
macs[incoming_mac] = True
example_mac = 'a:b:c:d'
if example_mac in macs:
mac_is_firewalled = macs[example_mac]
If you really wanted to go with a class (for the exercise
or because of wider requirements) you could do something
like this:
class Firewalled:
def __init__ (self):
self.macs = {}
def addDevice (address):
self.macs[address] = True
def removeDevice (address):
del self.macs[address]
def isFirewalled (address):
return address in self.macs
# or return self.macs.get (address, False)
but as you can see, in this form you're just wrapping
Python with Python.
> Sorry for the sloppy code so far, I'm really new to Python so it's a steep
> learning curve for me, I'm by no means a programming numpty and allot of
the
> principles are the same, but the languages I'm used to are more robust and
> vague so I don't have to define what type of data i'm storing the array
and
> things.
Ummm... in Python you don't have to define what type of
data you're storing. Welcome to the language in any case:
you'll find that people around here are generally quite
friendly but if you want, you might try the tutor list
where people are very used to dealing with newcomers:
http://mail.python.org/mailman/listinfo/tutor
TJG
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Class Dependancy Injection
Hey again guys, I'm looking to get an answer about dependency injection in python classes, what is the best way to deal with this? For instance, in my application I have a configuration bean which contains all the applications configuration information. Now in one of other classes I need access to those configuration settings. What I would have done in my ColdFusion/JAVA type applications is create an instance of the configuration bean, and then pass that in as an argument to the constructor for my other class, then have the other class set that as a 'self' variable. Then from within my class I can access the configuration details like self.config.getName() and it would return the name of the application. How is this best handled in python, can I still inject dependencies as a constructor argument like that? If so then is there anything in particular I need to watch out for that may cause me trouble? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
RE: Class Dependancy Injection
Thanks Steve that's good to here. I'll give it a shot this evening and if I have any problems then 'I'll be back';-) Rawlins -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Steve Holden Sent: 13 April 2007 17:32 To: [EMAIL PROTECTED] Subject: Re: Class Dependancy Injection Robert Rawlins - Think Blue wrote: > Hey again guys, > > > > I'm looking to get an answer about dependency injection in python > classes, what is the best way to deal with this? > > > > For instance, in my application I have a configuration bean which > contains all the applications configuration information. Now in one of > other classes I need access to those configuration settings. What I > would have done in my ColdFusion/JAVA type applications is create an > instance of the configuration bean, and then pass that in as an argument > to the constructor for my other class, then have the other class set > that as a 'self' variable. Then from within my class I can access the > configuration details like self.config.getName() and it would return the > name of the application. > > How is this best handled in python, can I still inject dependencies as a > constructor argument like that? If so then is there anything in > particular I need to watch out for that may cause me trouble? > That indeed sounds like the best way to proceed. You should find that, modulo the language differences, the technique works in just the same way. You shouldn't anticipate trouble. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Recent Ramblings http://holdenweb.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Signal Handlers
Hello Guys, Thanks again for all the help you've given me this past week, things are moving briskly and my class library is building nicely and seems to be working well :-D Now, I'm working with an API for another piece of software today, and the API documentation details the signals that are broadcast upon particular events, which I need to listen for and then handle. Here is an example: void RemoteDeviceFound(string address, uint32 class, int16 rssi) This signal will be send every time an inquiry result has been found by the service daemon. In general they only appear during a device discovery. Now, how do I listen for this signal? I've seen a couple of examples where by they import the signal module, and then to signal.signal(RemoteDeviceFound, myFunctionToCall) but the python documentation seemed to think that this would be limited to 2 arguments, when I've obviously got 3 of them. Perhaps I've got my wires crossed, if it's really that simple then great. However, where about in my application should I declare that signal listener? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Import From SubFolder
Chaps, Is it possible to import a module from a subdirectory in my application? I can only seem to get it to import from a single directory, but keeping all my files and classes in the same directory becomes a little sloppy. Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Writing Log CSV (Efficiently)
Hello Guys,
I'm looking to write a Log file which will be CSV based, and there is a good
possibility that it'll get quite busy once its up and running, so I'm
looking for the most efficient way to achieve it. Whilst I'm sure i could do
something like this.
myfile = open("Logs/Application.txt", "w")
myfile.write('col1, col2, col3, col4, col5')
myfile.close
But I'm a little apprehensive that open() and close() on a very regular
basis is just going to cause issues. I'm also a little worried that we'll
end up with 'race' type conditions and things going missing.
So my next thought was to just have an open object for the file, and then
perform multiple rights, until I need to send the report file somewhere
else, at which point I would close it. This in itself causes more issues as
we're running in a buffer which is just going to eat my memory, and as this
is on an embedded system which may lose power, we'd be kissing good bye to
all the logs until that point.
What would you guys suggest to be the most efficient way to handle this?
Thanks,
Rob
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RE: Writing Log CSV (Efficiently)
Hello Guys, Thanks for the advice on this one. I'm running Debian Linux as an OS, if that makes any major differences. That inbuilt CSV stuff looked pretty tidy, as does the logging. I'd be keen to learn a little more about that performance wise though. The log at its highest rate of write may be looking at an operation a second, I've not got much experience with this kind of thing so I'm not sure if that's 'a lot' or not, it just seems like it at the moment. It might not get as busy as that, I'm not sure and its difficult to simulate as this isn't likely to be a steady flow of traffic, they'll come in big fat lumps every now and then. Thanks, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: 16 April 2007 15:12 To: Dave Borne Cc: Robert Rawlins - Think Blue; python-list@python.org Subject: Re: Writing Log CSV (Efficiently) Dave> Python has built in logging support. It's pretty flexible as far Dave> as formatting output. I can get a bit complicated to set up, but Dave> it will handle traffic well. Really? I've found it to be a dog in heavy logging situations. Skip -- http://mail.python.org/mailman/listinfo/python-list
RE: Writing Log CSV (Efficiently)
Thanks for that Tim,
I could use a little more help with this CSV stuff this afternoon and I
can't get it to write the output I want for the life of me. I'm trying to
write a method for my logging class that receives a string as an argument,
and then writes a row to the CSV with the string and a date/time stamp.
''' Add Application Log Entry '''
def addApp(self, event):
writer = csv.writer(open("some.csv", "a"))
writer.writerow(event)
Now if I do something like this; addApp('Application Started') then it
writes to the CSV file somthing like.
A,p,p,l,i,c,a,t,i,o,n, ,S,t,a,r,t,e,d
Which isn't much use to me :-D any ideas how I can get something like this:
2007-01-01,13:00:00,Application Started
Thanks,
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Tim Golden
Sent: 16 April 2007 15:28
Cc: python-list@python.org
Subject: Re: Writing Log CSV (Efficiently)
Robert Rawlins - Think Blue wrote:
> The log at its highest rate of write may be looking at an operation a
> second
I think I can probably type stuff in faster than that if
I try :) You probably don't have a performance issue there.
, I've not got much experience with this kind of thing so
I'm not sure
> if that's 'a lot' or not, it just seems like it at the moment. It might
not
> get as busy as that, I'm not sure and its difficult to simulate as this
> isn't likely to be a steady flow of traffic, they'll come in big fat lumps
> every now and then.
Sounds like you don't really need to profile that, but if
you did, Python's a great language for knocking together
that kind of test harness; combine the time, random and
csv modules and you've got a "big fat lumps every now and
then" simulation. (At which point I get jumped on by the
serious model types for being so blase with their discipline!)
TJG
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RE: file resume
Do the same again, but change that 'wb' to 'a' for append :-D should sort
you out.
Rob
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of luca72
Sent: 16 April 2007 16:57
To: python-list@python.org
Subject: file resume
Hello at all:
if i have one file written in binary mode, how can i append others
binary data to this file after the its closure.
ex
my_file = open('blabal', 'wb')
then i write something and then
my_file.close()
now if i need to open it again and append other binary data how can i
proceed?
Regards
Luca
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Deleting or Empty a File
I'm looking to clear those log files we were discussing earlier chaps, What the best method to do this? Delete the file completely? Or just empty its content? Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
Signals
Hello Chaps,
I posted about this the other day but I'm still struggling to get any form
of result from it. Basically I have the following piece of code, and
according to its API is produces singals when particular events occur, but i
have no idea how to list for events, I've tried all sorts of combinations
using the signal module but haven't been able to get it working.
#!/usr/bin/python
import dbus, signal
bus = dbus.SystemBus()
obj = bus.get_object('org.bluez', '/org/bluez')
obj = bus.get_object('org.bluez', '/org/bluez/hci0')
adapter = dbus.Interface(obj, 'org.bluez.Adapter')
adapter.DiscoverDevices()
Now here is a copy of the API documentation that lists the signals thrown by
the API, this is the one I'm trying to listen for.
void RemoteDeviceFound(string address, uint32 class, int16 rssi)
This signal will be send every time an inquiry result
has been found by the service daemon. In general they
only appear during a device discovery.
Basically I'm just looking to run a function that will print those details
to screen. Can anyone help with working out how to listen for this signal?
I'd also like to know how i can keep the application running until I decided
to stop it manually, as the DiscoverDevices() can take a while to complete
and send out several RemoteDeviceFound() signals in that period.
Thanks guys
Rob
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array{uint32}
Guys,
I have a function that returns a array{uint32}, is there any way to output
that to screen in a more user friendly format? At the moment when I print it
by itself it appears as [65541L], which isn't much used to anyone.
I know this is probably a REALLY dumb question but I'm a little lost with
this API, its driving me nuts.
Thanks again guys,
Rob
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RE: Signals
Thanks Carsten,
Sorry for not mentioning the dbus before, I thought that the signals were a
general python thing, I didn’t realize it was a specific dbus thing.
I've now modified the code so it looks like this.
#!/usr/bin/python
import dbus
from gobject import MainLoop, idle_add
from dbus.mainloop.glib import DBusGMainLoop
def main_function():
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.bluez',
'/org/bluez'),'org.bluez.Manager')
adapter = dbus.Interface(bus.get_object('org.bluez',
manager.DefaultAdapter()),'org.bluez.Adapter')
def remote_device_found(addr, class_, rssi):
print 'Found:', addr
adapter.connect_to_signal('RemoteDeviceFound', remote_device_found)
adapter.DiscoverDevices()
if __name__ == '__main__':
idle_add(main_function)
dbus_mainloop_wrapper = DBusGMainLoop(set_as_default=True)
mainloop = MainLoop()
mainloop.run()
Which should implement the main loop and keep the application alive, however
when running the program I get the following error thrown at me.
File "./scan4.py", line 5, in ?
from dbus.mainloop.glib import DBusGMainLoop
ImportError: No module named mainloop.glib
Any ideas what might be causing this? My guess is that I don’t have one of the
dependency installed properly, but I have no idea which ones I need.
Thanks for any more help you can offer, its greatly appreciated.
Rob
-Original Message-
From: Carsten Haese [mailto:[EMAIL PROTECTED]
Sent: 18 April 2007 13:43
To: Robert Rawlins - Think Blue
Cc: python-list@python.org
Subject: Re: Signals
On Wed, 2007-04-18 at 08:39 +0100, Robert Rawlins - Think Blue wrote:
> Hello Chaps,
>
>
>
> I posted about this the other day but I’m still struggling to get any
> form of result from it. Basically I have the following piece of code,
> and according to its API is produces singals when particular events
> occur, but i have no idea how to list for events, I’ve tried all sorts
> of combinations using the signal module but haven’t been able to get
> it working.
> [...]
> import dbus, signal
> [...]
>
> Now here is a copy of the API documentation that lists the signals
> thrown by the API, this is the one I’m trying to listen for.
>
>
>
> void RemoteDeviceFound(string address, uint32 class, int16
> rssi)
>
>
>
>This signal will be send every time an inquiry result
>
>has been found by the service daemon. In general they
>
>only appear during a device discovery.
>
>
>
> Basically I’m just looking to run a function that will print those
> details to screen. Can anyone help with working out how to listen for
> this signal?
The signal module is for handling process signals the operating system
sends to your python process. The API you're using (dbus, a crucial
detail you neglected to mention before) doesn't send this kind of
signal.
Googling for 'python dbus documentation' brings up
http://dbus.freedesktop.org/doc/dbus-python/api/ , which seems to
explain everything you need. You need to get an instance of
dbus.Interface, which you seem to have done, and call its
connect_to_signal() method, which you don't seem to have done.
> I’d also like to know how i can keep the application running until I
> decided to stop it manually, as the DiscoverDevices() can take a while
> to complete and send out several RemoteDeviceFound() signals in that
> period.
The very first section of the above mentioned documentation talks about
needing a main loop for receiving signals, and it provides example
boilerplate code for how to set up a main loop.
Hope this helps,
Carsten.
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Wait For Application Start
Hello Guys, I'm kick starting my application using the inittab to ensure its re-spawned if it dies. However I need to ensure several other applications and service are up and running before my application is started, things such as dbus and a couple of other hardware stacks. A concept I've been advised to use is that I should make the application wait for the existence of a file before it starts, then create that file on the FS using the rc.local file which is called at the end of all other start items. Only once that file exists will my application commence with its job. This seems like a very logical method, but I'm not sure how to implement it into my python code? Is there a simple way to make it wait for that file? Without the need to build my own conditional loop? Can anyone perhaps help with a simple code example? Thanks guys, Rob -- http://mail.python.org/mailman/listinfo/python-list
Killing A Process By PID
Hello Guys,
I've got some code here which I'm using to kill a process if it freezes.
However I have no real way of testing it as I can't force a freeze on my
application. So thought I would run the code past you lot to see if anything
jumps out as not being quite right.
Now, my main application when it starts creates a lock file containing its
process ID using the following code:
file('/var/lock/Application.lock', 'w').write(str(os.getpid()))
Which to be honest appears to run just fine, when I look in that file it
always contains the correct process ID, for instance, 3419 or something like
that. This application also writes a date stamp to a log file every 10
seconds or so, and it's this date stamp that I use to determine if the
application has crashed.
def doCheck():
try:
f = open('/pblue/new/Logs/Alive.log','r')
try:
timestamp = f.read()
finally:
f.close()
except Exception, e:
logging.error(str(e))
nowdatetime = timestuff.now()
filedatetime = timestuff.strptime(timestamp, '%Y-%m-%d %H:%M:%S')
if timestuff.RelativeDateTimeDiff(nowdatetime,filedatetime).minutes > 1:
killApplication()
def killApplication():
pid = file('/var/lock/Application.lock').read().strip()
if file('/proc/%s/cmdline' % pid).read().endswith('python'):
os.system('kill %s' % pid)
Now, this second script is run every minute on the system, the idea is to
check that time stamp file, and if it hasn't been updated in the past
minute, then kill the process, inittab can then pick it back up and it will
be as right as rain again. Now the problem is that I'm unable to test it
properly, and from what I've seen so far, when the app does freeze, the
process isn't being killed, which leads me to believe something isn't quite
right in my second script above.
Does anyone spot anything that sticks out? Or perhaps something I could be
doing a little better?
Thanks guys,
Rob
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Almost There - os.kill()
Hello Guys,
Finally got around to sitting down to tidy up this script this morning but
I'm having a small syntax problem with os.kill() to kill a process on my
system. Here is the code:
def killApplication():
pid = file('/var/lock/MyApplication.lock').read().strip()
logging.info('Killing Application Process: %s' % pid)
os.kill(pid, 15)
logging.info('Application %s Killed' % pid)
As you can see if rips the PID from the lock file, which works fine as I get
log data which says 'Killing Application Process: 3079' exactly as I would
expect it too. However when I run this script I get the following error:
Traceback (most recent call last):
File "/pblue/new/Alive.py", line 50, in ?
main()
File "/pblue/new/Alive.py", line 47, in main
doCheck()
File "/pblue/new/Alive.py", line 43, in doCheck
killApplication()
File "/pblue/new/Alive.py", line 28, in killApplication
os.kill(pid, 15)
TypeError: an integer is required
Which would suggest its passing those arguments in as the wrong data types
to the kill command. What is the best way to convert these?
Thanks guys,
Rob
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RE: Almost There - os.kill()
Woops,
Spoke too soon, just wrapped them in int() and it works a charm :-D
Rob
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Robert Rawlins - Think Blue
Sent: 24 September 2007 12:23
To: python-list@python.org
Subject: Almost There - os.kill()
Hello Guys,
Finally got around to sitting down to tidy up this script this morning but
I'm having a small syntax problem with os.kill() to kill a process on my
system. Here is the code:
def killApplication():
pid = file('/var/lock/MyApplication.lock').read().strip()
logging.info('Killing Application Process: %s' % pid)
os.kill(pid, 15)
logging.info('Application %s Killed' % pid)
As you can see if rips the PID from the lock file, which works fine as I get
log data which says 'Killing Application Process: 3079' exactly as I would
expect it too. However when I run this script I get the following error:
Traceback (most recent call last):
File "/pblue/new/Alive.py", line 50, in ?
main()
File "/pblue/new/Alive.py", line 47, in main
doCheck()
File "/pblue/new/Alive.py", line 43, in doCheck
killApplication()
File "/pblue/new/Alive.py", line 28, in killApplication
os.kill(pid, 15)
TypeError: an integer is required
Which would suggest its passing those arguments in as the wrong data types
to the kill command. What is the best way to convert these?
Thanks guys,
Rob
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Subprocess Running Slowly
Hello Guys, I'm looking for a little advice on spawning a sub process to run a command line application for transferring a file over Bluetooth. Now the spawned process runs from start to finish exactly as I would expect it too, however its very slow. Now the main reason this is so odd, is that If I have my python application running as usual, and I start the command line application manually myself from the command line, then it'll transfer the file to my phone about 3 or 4 times faster than when the app is launch using sub process. Take a look below for a quick snippet example of my process launch code. send = 'ussp-push --debug --dev hci%s [EMAIL PROTECTED] /pblue/new/Media/%s %s' % ( adapter, mac, result, media[3], media[0] ) process = subprocess.Popen( send, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).stderr Do you have any ideas what might be causing this slow behaviour? Do spawned sub processes generally run at a much slower rate than expected? Or is this something specific to my application? I'd love to work this out as when transferring larger files this becomes a real pain, especial when I know there is no real physical reason for it running so slowly. Thanks guys for any help you can offer. Rob -- http://mail.python.org/mailman/listinfo/python-list
Control Log File Size
Hello Chaps, I've got an application running on linux which writes log files using the python logging module. I'm looking for some help and advice to cap the size which the file will grow too, something reasonably like 2Mb would be great. What is the best way to handle this kind of thing? Can this be done using a setting in the logging module? Or is it something I'll have to get the FS to handle for me? Thanks chaps, Rob -- http://mail.python.org/mailman/listinfo/python-list
Check File Change Every 10 Seconds
Hello Chaps, I've got a requirement to check a file for a change every 10 seconds or so, and if the file has been modified since the last time I parsed its content into the application then I need to parse it in again. However, I need this process to not interrupt the rest of my application flow. What is the best way to handle this? Is there some form of file watcher module for python which can watch the file for me and then parse any changes into the application memory? Or should I be spawning and unjoined thread which contains and infinite loop which checks a date/time the file was modified against an internal date/time variable for when the application last parsed the file into memory? I'll be interested to hear your ideas guys, Thanks, Rob -- http://mail.python.org/mailman/listinfo/python-list
