Re: How to do relpath implementation on 2.5
On Aug 8, 9:08 pm, Brian Allen Vanderburg II
wrote:
> I've coded my own 'relpath' implementation for 2.5 (shown below) and I
> want to make sure it follows as closely as it should to 2.6 and later.
> I've got a question regarding that. When attempting to convert to a
> relative path and it is not possible for some reason (different drive or
> UNC share), should that be an error or should it return the absolute
> path of the target? I'm using Debian so I don't have 2.6 available
> right now for testing.
Usually Python source code is easily browsed at:
http://svn.python.org/view/
Unfortunately the server is down right now.
The implementation in 2.6 raises a ValueError exception. Here is the
function from ntpath.py:
def relpath(path, start=curdir):
"""Return a relative version of a path"""
if not path:
raise ValueError("no path specified")
start_list = abspath(start).split(sep)
path_list = abspath(path).split(sep)
if start_list[0].lower() != path_list[0].lower():
unc_path, rest = splitunc(path)
unc_start, rest = splitunc(start)
if bool(unc_path) ^ bool(unc_start):
raise ValueError("Cannot mix UNC and non-UNC paths (%s and
%s)"
%
(path, start))
else:
raise ValueError("path is on drive %s, start on drive %s"
% (path_list[0],
start_list[0]))
# Work out how much of the filepath is shared by start and path.
for i in range(min(len(start_list), len(path_list))):
if start_list[i].lower() != path_list[i].lower():
break
else:
i += 1
rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
if not rel_list:
return curdir
return join(*rel_list)
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Re: unicode() vs. s.decode()
-On [20090808 20:07], Thorsten Kampe (thors...@thorstenkampe.de) wrote: >In real life people won't even notice whether an application takes one or >two minutes to complete. I think you are quite wrong here. I have worked with optical engineers who needed to calculate grating numbers for their lenses. If they can have a calculation program that runs in 1 minute instead of 2 they can effectively double their output during the day (since they run calculations hundreds to thousand times a day to get the most optimal results with minor tweaks). I think you are being a bit too easy on hand waving here that mere minute runtimes are not noticeable. -- Jeroen Ruigrok van der Werven / asmodai イェルーン ラウフロック ヴァン デル ウェルヴェン http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B When we have not what we like, we must like what we have... -- http://mail.python.org/mailman/listinfo/python-list
Re: Why all the __double_underscored_vars__?
On Sat, 08 Aug 2009 12:11:19 +, kj wrote: > In Chris Rebert > writes: > >>The double-underscores indicate that the Python interpreter itself >>usually is the caller of the method, and as such some level of "magic" >>may be associated with it. Other languages have you do the equivalent of >>`def +():` or `def operator +()` to override an operator, the keyword or >>symbol serving a similar warning that "here be magic". > > In this case, then I hope that some of these __items__ get demoted to a > more mundane level, so that the notion of "magic" doesn't get > trivialized by everyday idioms like: > > if __name__ == '__main__': > # etc But that is magic, and just because it's magic doesn't mean it's not useful every day. I don't see what's so difficult about telling your students that double underscore names have special meaning to the Python interpreter. That doesn't mean you're forbidden from using them, or that you have to use them, it just means that they have a special meaning to the interpreter, and you usually don't call them directly. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Python docs disappointing - group effort to hire writers?
On Sat, 08 Aug 2009 20:27:49 +0100, Mark Lawrence wrote: > Further, I have seen many requests here which are nothing really to do > with Python, say a query about which algorithm to use. Response "Not > really a Python question, but try ...". Put the same question on (say) > the C ng and you'd be told in no uncertain terms to Foxtrot Oscar. We're a lot friendlier than the C newsgroup. Personally, I think knowing the right algorithm to use is as much a part of Python programming as knowing whether to call mystring.upper() or string.upper(mystring). -- Steven -- http://mail.python.org/mailman/listinfo/python-list
tracing openurl input and output?
How can I watch the messages being sent back and for on urllib shttp
requests? If it were simple http I would just watch the socket traffic
but of course that won't work for https. Is there a debug flag I can
set that will do this?
context: I am dealing with a web service bug and I want to tell
the provider exactly what is going back and forth to his server,
eliminating the "maybe there's a bug in your library" chat.
import urllib
params = urllib.urlencode({'spam': 1, 'eggs': 2, 'bacon': 0})
f = urllib.urlopen("https://example.com/cgi-bin/query";, params)
Many TIA!
--
Mark Harrison
Pixar Animation Studios
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Re: unicode() vs. s.decode()
On Sat, 08 Aug 2009 19:00:11 +0200, Thorsten Kampe wrote:
>> I was running it one million times to mitigate influences on the timing
>> by other background processes which is a common technique when
>> benchmarking.
>
> Err, no. That is what "repeat" is for and it defaults to 3 ("This means
> that other processes running on the same computer may interfere with the
> timing. The best thing to do when accurate timing is necessary is to
> repeat the timing a few times and use the best time. [...] the default
> of 3 repetitions is probably enough in most cases.")
It's useful to look at the timeit module to see what the author(s) think.
Let's start with the repeat() method. In the Timer docstring:
"The repeat() method is a convenience to call timeit() multiple times and
return a list of results."
and the repeat() method's own docstring:
"This is a convenience function that calls the timeit() repeatedly,
returning a list of results. The first argument specifies how many times
to call timeit(), defaulting to 3; the second argument specifies the
timer argument, defaulting to one million."
So it's quite obvious that the module author(s), and possibly even Tim
Peters himself, consider repeat() to be a mere convenience method.
There's nothing you can do with repeat() that can't be done with the
timeit() method itself.
Notice that both repeat() and timeit() methods take an argument to
specify how many times to execute the code snippet. Why not just execute
it once? The module doesn't say, but the answer is a basic measurement
technique: if your clock is accurate to (say) a millisecond, and you
measure a single event as taking a millisecond, then your relative error
is roughly 100%. But if you time 1000 events, and measure the total time
as 1 second, the relative error is now 0.1%.
The authors of the timeit module obvious considered this an important
factor: not only did they allow you to specify the number of times to
execute the code snippet (defaulting to one million, not to one) but they
had this to say:
[quote]
Command line usage:
python timeit.py [-n N] [-r N] [-s S] [-t] [-c] [-h] [statement]
Options:
-n/--number N: how many times to execute 'statement'
[...]
If -n is not given, a suitable number of loops is calculated by trying
successive powers of 10 until the total time is at least 0.2 seconds.
[end quote]
In other words, when calling the timeit module from the command line, by
default it will choose a value for n that gives a sufficiently small
relative error.
It's not an accident that timeit gives you two "count" parameters: the
number of times to execute the code snippet per timing, and the number of
timings. They control (partly) for different sources of error.
--
Steven
--
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Re: tracing openurl input and output?
m...@pixar.com wrote:
> How can I watch the messages being sent back and for on urllib shttp
> requests? If it were simple http I would just watch the socket traffic
> but of course that won't work for https. Is there a debug flag I can
> set that will do this?
>
> context: I am dealing with a web service bug and I want to tell
> the provider exactly what is going back and forth to his server,
> eliminating the "maybe there's a bug in your library" chat.
>
> import urllib
> params = urllib.urlencode({'spam': 1, 'eggs': 2, 'bacon': 0})
> f = urllib.urlopen("https://example.com/cgi-bin/query";, params)
>
> Many TIA!
>
If you are running on Windows then I'd say get hold of a copy of fiddler2
(http://www.fiddler2.com/fiddler2/) and tell your code to use it as a
proxy. It does an excellent job of capturing and decoding web traffic and
even lets you modify packets as they go past. The only thing to watch for
with https is that your code will see an invalid certificate as of course
it sees fiddler's own self signed certificate instead of the original.
I'm not sure what Linux or Mac equivalents there might be (though in a
pinch you can always run your code on one system and Fiddler on a different
one).
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String algo
I will be receiving data serially from another pc,.i can use any sort of marker between two packets,i will be the person sending data as well after reading it from some devices.But packet length is not constant. each packet has this format: 201.535a56.65b4.56c89.565d another packet could be : 4a5b6c7d What i need is a program to store variables such as:var_a has value 4,var_b has value 5,for second string. I have to read and write data continuosly using serial port. -- http://mail.python.org/mailman/listinfo/python-list
Need help in configuration for TimedRotatingFileHandler
Hi,
Need help in configure the TimedRotatingFileHandler from configuration
file
I have tried with the below code and ended up with the error, code is
pasted below
Error - IOError: [Errno 2] No such file or directory: 'G:\\lok_sib\
\logs\rotate_test'
[loggers]
keys=root,simpleExample
[handlers]
keys=consoleHandler,timedRotatingFileHandler
[formatters]
keys=simpleFormatter
[logger_root]
level=DEBUG
handlers=consoleHandler
[logger_simpleExample]
level=DEBUG
handlers=timedRotatingFileHandler
qualname=simpleExample
propagate=0
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)
[handler_timedRotatingFileHandler]
class=handlers.TimedRotatingFileHandler
level=DEBUG
formatter=simpleFormatter
args=("G:\lok_sib\logs\rotate_test", 'midnight', 1)
[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt='%Y-%m-%d %H:%M:%S'
Thanks or your time
Regards,
Lokesh
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resume upload wsgi script
I working on a resume upload script and encountered the following
problems
sql: Could not decode to UTF-8 column 'SUBSTR(picture,?)' with text
'\ufffd\ufff
d\ufffd\ufffd↑!ExifEf1gL6KM7Ij5ae0gL6KM7cH2cH2GI3
Content-Disposition: form-data; name="Filename"
DSC00013.JPG
Ef1
when I dont use SUBSTR or COALESCE and || it works
def application(environ, response):
range=environ.get('HTTP_RANGE','bytes=0-').replace
('bytes=','').split(',')
offset=[]
for r in range: offset.append(r.split('-'))
db.execute('UPDATE users SET picture=SUBSTR(picture,?) WHERE
uid=?', (offset[0][0],s.UID))
chunk=environ['wsgi.input'].read(int(environ
['CONTENT_LENGTH'])).decode('latin1')
db.execute('UPDATE users SET picture=COALESCE(picture,?)||? WHERE
uid=?', (''.encode('latin1'),chunk.encode('latin1'), s.UID))
#while True:
# chunk=environ['wsgi.input'].read(8192).decode('latin1')
# if not chunk: break
# db.execute("UPDATE users SET picture=COALESCE
(picture,'')||? WHERE uid=?", (chunk, s.UID))
the following is the POST clean up when PUT is not used, does anyone
know how to do this without loading the complete blob into memory ?
db.execute('SELECT picture FROM users WHERE uid=?',(s.UID,))
f=db.fetch()
b=environ['CONTENT_TYPE'].split('boundary=')[1]
p=search(b+r'.*?Content-Type: application/octet-stream\r\n\r\n(.*?)
\r\n--'+b,f[0][0].decode('latin1'),DOTALL).group(1)
db.execute('UPDATE users SET picture=? WHERE uid=?', (p.encode
('latin1'), s.UID))
--
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exec("dir()",d)
Greetings everybody,
I don't quite understand why if I do this:
>>> d = {}
>>> exec("dir()", d)
1) d is no longer empty
2) the content of d now looks like __builtins__.__dict__ but isn't
quite it d == __builtins__.__dict__ returns false.
Can anybody shed some light?
Manu
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Re: exec("dir()",d)
Emanuele D'Arrigo wrote:
> Greetings everybody,
>
> I don't quite understand why if I do this:
>
d = {}
exec("dir()", d)
>
> 1) d is no longer empty
> 2) the content of d now looks like __builtins__.__dict__ but isn't
> quite it d == __builtins__.__dict__ returns false.
>
> Can anybody shed some light?
You should check up on what exec does. In this case it runs a string
containing code using dictionary `d` as its global namespace, and so `d` has
to contain the usual global namespace symbols -- otherwise `dict` can't
work. `__builtins__.__dict__ is one of the elements in the global
namespace, not the namespace itself. Another example:
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a=7
>>> d={'b':a}
>>> exec ("print b", d)
7
>>> d
{'__builtins__': {'bytearray': , 'IndexError': , 'all': , 'help': Type
help() for interactive help, or help(object) for help about object., 'vars':
, 'SyntaxError': ,
'unicode': , 'UnicodeDecodeError': , 'isinstance': , 'copyright': Copyright (c) 2001-2009 Python Software
Foundation.
[ ... ]
'AssertionError': , 'classmethod': , 'UnboundLocalError': ,
'NotImplementedError': ,
'AttributeError': , 'OverflowError': }, 'b': 7}
>>>
To get rid of the name error, you'd need
d={}
d['d'] = d
exec ("dir (d)", d)
Mel.
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Re: exec("dir()",d)
Emanuele D'Arrigo schrieb:
Greetings everybody,
I don't quite understand why if I do this:
d = {}
exec("dir()", d)
1) d is no longer empty
2) the content of d now looks like __builtins__.__dict__ but isn't
quite it d == __builtins__.__dict__ returns false.
Can anybody shed some light?
RTFM helps ;) http://docs.python.org/reference/simple_stmts.html#exec
As a side effect, an implementation may insert additional keys into the
dictionaries given besides those corresponding to variable names set by
the executed code. For example, the current implementation may add a
reference to the dictionary of the built-in module __builtin__ under the
key __builtins__ (!).
Christian
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Re: Serial port access
On Sunday 09 August 2009 03:20:12 nipun batra wrote: > On Sun, Aug 9, 2009 at 2:11 AM, Chris Rebert wrote: > > On Sat, Aug 8, 2009 at 12:34 PM, nipun batra > > > > wrote: > > > Hi, > > > How can we access serial port using usb-serial converters,using python > > > in linux. > > > > PySerial might also be an option: > > http://pyserial.sourceforge.net/index.html > > > > Cheers, > > Chris > > -- > > http://blog.rebertia.com > > pySerial mentions about serial ports but not about usb-serial.Can i do > something like convert my usb-serial to act as serial port and then use > pySerial You can also look in the /dev directory to see which tty is created when you plug in the usb to serial converter, and use that /dev/ttySx as a file, reading and writing to it directly. You will need this information whatever you do, as you will need to specify which port to use, to whatever software you choose to use. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
setting Referer for urllib.urlretrieve
Here's what I have so far:
import urllib
class AppURLopener(urllib.FancyURLopener):
version = "App/1.7"
referrer = None
def __init__(self, *args):
urllib.FancyURLopener.__init__(self, *args)
if self.referrer:
addheader('Referer', self.referrer)
urllib._urlopener = AppURLopener()
Unfortunately, the 'Referer' header potentially varies for each url
that I retrieve, and the way the module is written, I can't change the
calls to __init__ or open. The best idea I've had is to assign a new
value to my class variable just before calling urllib.urlretrieve(),
but that just seems ugly. Any ideas? Thanks.
PS for anyone not familiar with the RFCs: Yes, I'm spelling
"referrer" correctly everywhere in my code.
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Re: resume upload wsgi script
gert schrieb: I working on a resume upload script and encountered the following problems sql: Could not decode to UTF-8 column 'SUBSTR(picture,?)' with text '\ufffd\ufff d\ufffd\ufffd↑!ExifEf1gL6KM7Ij5ae0gL6KM7cH2cH2GI3 Content-Disposition: form-data; name="Filename" You are treating a binary data column as if it were a string. That's bogus, you need to use a blob column. Also I wouldn't combine the uplodaded chunks until the full upload is finished - and even then only if I actually need the data. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: resume upload wsgi script
On Aug 9, 3:17 pm, "Diez B. Roggisch" wrote: > gert schrieb: > > > I working on a resume upload script and encountered the following > > problems > > > sql: Could not decode to UTF-8 column 'SUBSTR(picture,?)' with text > > '\ufffd\ufff > > d\ufffd\ufffd↑!ExifEf1gL6KM7Ij5ae0gL6KM7cH2cH2GI3 > > Content-Disposition: form-data; name="Filename" > > You are treating a binary data column as if it were a string. That's > bogus, you need to use a blob column. > > Also I wouldn't combine the uplodaded chunks until the full upload is > finished - and even then only if I actually need the data. > > Diez And the best solution would be to use TEXT instead or some sort of SUBBIN that i do not know of in sqlite ? -- http://mail.python.org/mailman/listinfo/python-list
Re: setting Referer for urllib.urlretrieve
On Sun, 09 Aug 2009 06:13:38 -0700, samwyse wrote:
> Here's what I have so far:
>
> import urllib
>
> class AppURLopener(urllib.FancyURLopener):
> version = "App/1.7"
> referrer = None
> def __init__(self, *args):
> urllib.FancyURLopener.__init__(self, *args)
> if self.referrer:
> addheader('Referer', self.referrer)
>
> urllib._urlopener = AppURLopener()
>
> Unfortunately, the 'Referer' header potentially varies for each url that
> I retrieve, and the way the module is written, I can't change the calls
> to __init__ or open. The best idea I've had is to assign a new value to
> my class variable just before calling urllib.urlretrieve(), but that
> just seems ugly. Any ideas? Thanks.
[Aside: an int variable is an int. A str variable is a str. A list
variable is a list. A class variable is a class. You probably mean a
class attribute, not a variable. If other languages want to call it a
variable, or a sausage, that's their problem.]
If you're prepared for a bit of extra work, you could take over all the
URL handling instead of relying on automatic openers. This will give you
much finer control, but it will also require more effort on your part.
The basic idea is, instead of installing openers, and then ask the urllib
module to handle the connection, you handle the connection yourself:
make a Request object using urllib2.Request
make an Opener object using urllib2.build_opener
call opener.open(request) to connect to the server
deal with the connection (retry, fail or read)
Essentially, you use the Request object instead of a URL, and you would
add the appropriate referer header to the Request object.
Another approach, perhaps a more minimal change than the above, would be
something like this:
# untested
class AppURLopener(urllib.FancyURLopener):
version = "App/1.7"
def __init__(self, *args):
urllib.FancyURLopener.__init__(self, *args)
def add_referrer(self, url=None):
if url:
addheader('Referer', url)
urllib._urlopener = AppURLopener()
urllib._urlopener.add_referrer("http://example.com/";)
--
Steven
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Re: resume upload wsgi script
gert schrieb: On Aug 9, 3:17 pm, "Diez B. Roggisch" wrote: gert schrieb: I working on a resume upload script and encountered the following problems sql: Could not decode to UTF-8 column 'SUBSTR(picture,?)' with text '\ufffd\ufff d\ufffd\ufffd↑!ExifEf1gL6KM7Ij5ae0gL6KM7cH2cH2GI3 Content-Disposition: form-data; name="Filename" You are treating a binary data column as if it were a string. That's bogus, you need to use a blob column. Also I wouldn't combine the uplodaded chunks until the full upload is finished - and even then only if I actually need the data. Diez And the best solution would be to use TEXT instead or some sort of SUBBIN that i do not know of in sqlite ? No, the best solution would be to use "BLOB", and no SUB*-stuff, but instead a 1:n-relation of chunks, that when the upload is finished you can easily combine in python to one large blob, storing that in the DB again. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Need help in configuration for TimedRotatingFileHandler
On Sun, Aug 9, 2009 at 5:13 PM, Lokesh wrote: > Hi, > > Need help in configure the TimedRotatingFileHandler from configuration > file > > I have tried with the below code and ended up with the error, code is > pasted below > Error - IOError: [Errno 2] No such file or directory: 'G:\\lok_sib\ > \logs\rotate_test' Does the directory G:\\lok_sib\\logs exist? > -- kushal -- http://mail.python.org/mailman/listinfo/python-list
Re: Need help in configuration for TimedRotatingFileHandler
09-08-2009 Lokesh wrote: I have tried with the below code and ended up with the error, code is pasted below Error - IOError: [Errno 2] No such file or directory: 'G:\\lok_sib\ \logs\rotate_test' Note that: '\r' is listed (interpreted by Python as 'carriage return' special character) and not '\\r' (which would mean '\' char + 'r' char). Regards, *j -- Jan Kaliszewski (zuo) -- http://mail.python.org/mailman/listinfo/python-list
Twisted - how to get text for HTTP error responses
Hi, I am writing a HTTP client in Twisted. The client contacts the server, and any errors in the sent messages will be returned back to the client in 400 message. The reason for failure at the server is sent as the text in the 400 message. I tried the same using the browser, and I can see the error text (the text might be like - 'Item X not found in DB'). The client is supposed to use this text and calculate the next messages to be sent to the server. But, I cannot seem to find a mechanism to get the response text from the errback. I went through failure.py, but I couldnt find a way to do it. Ex: I send a data to the server as so d = defer.waitForDeferred(getPage(url, method='POST', headers=hdr, postdata=form)) yield d try: reply = d.getResult() success(reply) except Error, failure: failure(failure) Now, inside failure method, I was unable to print the text out - say 'Item X not found in DB'. Is it possible using Twisted? If so, how can it be done? Thanks in Advance K -- http://mail.python.org/mailman/listinfo/python-list
Re: Bug or feature: double strings as one
On Aug 8, 12:43 pm, "Jan Kaliszewski" wrote:
> 08-08-2009 Steven D'Aprano wrote:
...(snip)
> I use it very often, e.g.:
>
> afunction('quite long string %s quite long string '
> 'quite long string quite long string %s '
> 'quite %s long string quite long string'
> % (variable1, variable2, variable3))
>
> It seems nicer to me than:
>
> afunction(('quite long string %s quite long string '
> + 'quite long string quite long string %s '
> + 'quite %s long string quite long string')
> % (variable1, variable2, variable3))
>
> (Note that multiline-'''-strings are usless in such cases).
>
uhh? A much better way to handle such a problem is like this...
prompt1 = '''
Some people like to use %s
ways of doing things just
so they can support their %s
way of coding
'''
afunction(prompt1 %(var1, var2))
WOW!, that just somehow looks more professional to me? I hate to long
strings in the middle of a code block. Please be smart when writing
code people!!
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Re: Twisted - how to get text for HTTP error responses
On 03:35 pm, koranth...@gmail.com wrote: Hi, I am writing a HTTP client in Twisted. The client contacts the server, and any errors in the sent messages will be returned back to the client in 400 message. The reason for failure at the server is sent as the text in the 400 message. I tried the same using the browser, and I can see the error text (the text might be like - 'Item X not found in DB'). The client is supposed to use this text and calculate the next messages to be sent to the server. But, I cannot seem to find a mechanism to get the response text from the errback. I went through failure.py, but I couldnt find a way to do it. Ex: I send a data to the server as so d = defer.waitForDeferred(getPage(url, method='POST', headers=hdr, postdata=form)) yield d try: reply = d.getResult() success(reply) except Error, failure: failure(failure) Now, inside failure method, I was unable to print the text out - say 'Item X not found in DB'. Is it possible using Twisted? If so, how can it be done? The Error instance which the local "failure" is bound to in your example above has a number of attributes, one of which is "status" which may be what you're looking for. If not, take a look at its other attributes. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Client/Server based on SocketServer and Windows
Hello list,
I've written a small Client/server system.
Basically, i'm expecting something like : The client sends every once
and a while a small data chunk (not more than 50 bytes) the server
receive it and print it.
Here is the server request handler :
class ThreadedTCPRequestHandlerFoo(SocketServer.BaseRequestHandler):
def handle(self):
data = self.request.recv(1024)
cur_thread = threading.currentThread()
response = "%s: %s from Foo" % (cur_thread.getName(),
data)
print response
and this is the client :
def clientPrompt(ip, port, message):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((ip, port))
while(1):
k=raw_input('#>')
sock.send(k)
print "%s\n" % k
if k == 'quit': break
sock.close()
My problem comes from that I can't send data from client more than
once without having the following Winsock error : 10053 Software
caused connection abort.
I have to restart the client each time I want to send a new message.
Could anyboy explain me why ?
Regards
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Re: String algo
nipun batra wrote:
I will be receiving data serially from another pc,.i can use any sort of
marker between two packets,i will be the person sending data as well after
reading it from some devices.But packet length is not constant.
each packet has this format:
201.535a56.65b4.56c89.565d
another packet could be :
4a5b6c7d
What i need is a program to store variables such as:var_a has value 4,var_b
has value 5,for second string.
I have to read and write data continuosly using serial port.
Sounds like you want to break apart your string at the
non-numeric bits, and then create a mapping from them:
>>> import re
>>> s = "201.535a56.65b4.56c89.565d"
>>> r = re.compile(r"(\d+(?:\.\d+)?)([a-z]+)", re.I)
>>> r.findall(s)
[('201.535', 'a'), ('56.65', 'b'), ('4.56', 'c'), ('89.565', 'd')]
>>> d = dict((k,float(v)) for v,k in r.findall(s))
>>> print d['a']
201.535
>>> print d['c']
4.56
>>> print 'z' in d
False
>>> print 'b' in d
True
Adjust the regexp accordingly if there are +/- signs,
exponentiation, limits on the splitting-characters, etc.
-tkc
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Re: Bug or feature: double strings as one
r wrote: > On Aug 8, 12:43 pm, "Jan Kaliszewski" wrote: >> (Note that multiline-'''-strings are usless in such cases). >> > > uhh? A much better way to handle such a problem is like this... > > prompt1 = ''' > Some people like to use %s > ways of doing things just > so they can support their %s > way of coding > ''' Oh wow, you so need to work on your reading comprehension skills! Didn't you notice Jan's comment that multiline ''' strings are useless??? They add extra newlines into the string which aren't wanted. > WOW!, that just somehow looks more professional to me? I hate to long > strings in the middle of a code block. Please be smart when writing > code people!! Because totally failing to pay attention to the requirements is "smart". -- http://mail.python.org/mailman/listinfo/python-list
Re: Bug or feature: double strings as one
09-08-2009 r wrote:
On Aug 8, 12:43 pm, "Jan Kaliszewski" wrote:
08-08-2009 Steven D'Aprano wrote:
...(snip)
I use it very often, e.g.:
afunction('quite long string %s quite long string '
'quite long string quite long string %s '
'quite %s long string quite long string'
% (variable1, variable2, variable3))
It seems nicer to me than:
afunction(('quite long string %s quite long string '
+ 'quite long string quite long string %s '
+ 'quite %s long string quite long string')
% (variable1, variable2, variable3))
(Note that multiline-'''-strings are usless in such cases).
uhh? A much better way to handle such a problem is like this...
prompt1 = '''
Some people like to use %s
ways of doing things just
so they can support their %s
way of coding
'''
Sorry, you are wrong, '''-way would be usefull only if:
* you want to have '\n' in each place where you wrap the
literal in your code,
and
* you use '''-literal at a module (non-indented) level
or you need not only '\n'-s but also indentations
(dependent on indentation of your code),
or such ugly indentation is ok for you:
some indentated code...
prompt = '''quite long string %s quite long string
''' quite long string quite long string %s
''' quite %s long string quite long string
'''
some indentated code...
That's why I wrote it's "useless in such cases."
Regards,
*j
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Problem with join in__str__() in class (newbie)
Hello, I've written two classes. One class describes experts: experts
has a unique ID and a name. An expert knows topics and other experts. A
topic is described by my other class and includes a unique ID and a
name. Now I have a problem with the __str__ method in my Expert class:
def __str__(self):
output = '%s:%s' % (self.expert_id, self.name)
output += '\nKnown topics: %s' % (', '.join(str(self.topics)))
# print 'Known experts: '
# for e in self.known_experts:
# print '%s:%s' % (e.expert_id, e.name)
return output
self.topics is a list of objects of type Topic.
self.known_experts is a list of objects of type Expert, specifically the
experts known by the given expert.
When I print an object of type Expert, the output is not what I want. If
the expert knows only one topic, say polemics, the output is:
e2:Carla
Known topics: t, 5, :, P, o, l, e, m, i, c, s
If the expert knows two topics, say Polemics and The Parthenon, then the
output is:
e2:Carla
Known topics: [, <, _, _, m, a, i, n, _, _, ., T, o, p, i, c, , i, n,
s, t, a, n, c, e, , a, t, , 0, x, 0, 2, 2, 2, D, 0, 8, 0, >, ]
This is not what I want. :) I want the output like this:
e2:Carla
Known topics: t5:Polemics, t6:The Parthenon
Also, notice the code I've commented out. If I can get the join above to
work (with your help) my next question is how to present the known
experts in a comma separated list with only expert_id and name? I can't
use the normal __str__() method (the one I'm writing here) because it
prints too much information. Does that mean a join is out of the question?
Thanks for any replies!
- Fencer
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Re: Problem with join in__str__() in class (newbie)
> def __str__(self):
> output = '%s:%s' % (self.expert_id, self.name)
> output += '\nKnown topics: %s' % (', '.join(str(self.topics)))
You're turning your list into a string -- try this:
', '.join([str(x) for x in self.topics])
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Re: Problem with join in__str__() in class (newbie)
output += '\nKnown topics: %s' % (', '.join(str(self.topics)))
Your problem is here.
self.topics is a list of topic instances: but you're calling str() on the
list itself to turn the LIST itself into a string. Compare:
>>> x = [1,2,3]
>>> x
[1, 2, 3]
>>> str(x)
'[1, 2, 3]'
Now, after str(self.topics) is done, you have one big string. A string is a
sequence of characters (mostly). Calling ",".join(string) will do just what
you see there-- return a string with a comma between each character.
What you want to do, I assume, is call str() on each item in self.topics,
and join them.
That would be:
output += '\nKnown topics: %s' % ( ','.join(str(item) for item in
self.topics) )
That's a generator expression which will do what you want, I believe.
Provided your topic instances have a __str__ method that returns a string of
the form "t:".
Also, notice the code I've commented out. If I can get the join above to
> work (with your help) my next question is how to present the known experts
> in a comma separated list with only expert_id and name? I can't use the
> normal __str__() method (the one I'm writing here) because it prints too
> much information. Does that mean a join is out of the question?
Honestly, I think you are putting too much into the Expert class's __str__
method. I would make it do basically:
return "%s:%s" % (self.expert_id, self.name)
And then put the __str__ you're working on above in a different method which
does -- more. Call it 'dump' or something. That way you CAN just use the
normal str/__str__ from within this 'dump' and get what you want. str()
should return that object in its stringified form. Another method is a
better way to dump 'that object' and things 'around' it and that it 'knows'.
But if you really must have just str(expert) and have it return the big
chunk of information, your commented code looks about right. You'll have to
use your knowledge of how the internal expert class works instead of relying
on the experts just returning a str() of themselves. That's slightly bad.
But not horrible.
HTH,
--S
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Re: Problem with join in__str__() in class (newbie)
jon rascal wrote:
You're turning your list into a string -- try this:
', '.join([str(x) for x in self.topics])
Thanks for your quick reply, unfortunately it didn't quite work for me.
Say topics contain two topics: polemics, and the parthenon I get this
output:
e2:Carla
Known topics: t5:Polemics
only the first topic is printed. If topics only contain a single topic I
get this error:
Traceback (most recent call last):
File "C:\Users\fencer\workspace\Find Expert\src\find_expert.py", line
57, in
print experts[1]
File "C:\Users\fencer\workspace\Find Expert\src\find_expert.py", line
21, in __str__
output += '\nKnown topics: %s' % (', '.join([str(x) for x in
self.topics]))
TypeError: iteration over non-sequence
What did I do wrong?
- Fencer
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Re: resume upload wsgi script
On Aug 9, 4:42 pm, "Diez B. Roggisch" wrote: > gert schrieb: > > > > > On Aug 9, 3:17 pm, "Diez B. Roggisch" wrote: > >> gert schrieb: > > >>> I working on a resume upload script and encountered the following > >>> problems > >>> sql: Could not decode to UTF-8 column 'SUBSTR(picture,?)' with text > >>> '\ufffd\ufff > >>> d\ufffd\ufffd↑!ExifEf1gL6KM7Ij5ae0gL6KM7cH2cH2GI3 > >>> Content-Disposition: form-data; name="Filename" > >> You are treating a binary data column as if it were a string. That's > >> bogus, you need to use a blob column. > > >> Also I wouldn't combine the uplodaded chunks until the full upload is > >> finished - and even then only if I actually need the data. > > >> Diez > > > And the best solution would be to use TEXT instead or some sort of > > SUBBIN that i do not know of in sqlite ? > > No, the best solution would be to use "BLOB", and no SUB*-stuff, but > instead a 1:n-relation of chunks, that when the upload is finished you > can easily combine in python to one large blob, storing that in the DB > again. > > Diez so one table of chunks CREATE TABLE temp ( file_id VARCHAR(64), chunK_id INTEGER, chunk BLOB, PRIMARY KEY(file_id,chunk_id) ); SELECT chunk FROM temp WHERE file_id = 'file' concatenating result in python update blob delete temp How do I concatenate results that do not fit into memory ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with join in__str__() in class (newbie)
>
> only the first topic is printed. If topics only contain a single topic I
> get this error:
> Traceback (most recent call last):
> File "C:\Users\fencer\workspace\Find Expert\src\find_expert.py", line 57,
> in
>print experts[1]
> File "C:\Users\fencer\workspace\Find Expert\src\find_expert.py", line 21,
> in __str__
>output += '\nKnown topics: %s' % (', '.join([str(x) for x in
> self.topics]))
> TypeError: iteration over non-sequence
>
> What did I do wrong?
>
It looks like, "if topics contains only a single topic", means:
self.topics = MyTopic
was done at some point. What you should do is make self.topics ALWAYS be a
list: even if it's only a list of one item.
So you do
self.topics.append(MyTopic)
when you add that one topic. That way self.topics is always a list.
Sometimes empty, sometimes containing one element, sometimes containing
many.
--S
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Re: Problem with join in__str__() in class (newbie)
Fencer wrote:
jon rascal wrote:
You're turning your list into a string -- try this:
', '.join([str(x) for x in self.topics])
Thanks for your quick reply, unfortunately it didn't quite work for me.
Say topics contain two topics: polemics, and the parthenon I get this
output:
e2:Carla
Known topics: t5:Polemics
only the first topic is printed. If topics only contain a single topic I
get this error:
Traceback (most recent call last):
File "C:\Users\fencer\workspace\Find Expert\src\find_expert.py", line
57, in
print experts[1]
File "C:\Users\fencer\workspace\Find Expert\src\find_expert.py", line
21, in __str__
output += '\nKnown topics: %s' % (', '.join([str(x) for x in
self.topics]))
TypeError: iteration over non-sequence
What did I do wrong?
Try printing self.topics. It should always be a list of topics.
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Re: resume upload wsgi script
gert schrieb: On Aug 9, 4:42 pm, "Diez B. Roggisch" wrote: gert schrieb: On Aug 9, 3:17 pm, "Diez B. Roggisch" wrote: gert schrieb: I working on a resume upload script and encountered the following problems sql: Could not decode to UTF-8 column 'SUBSTR(picture,?)' with text '\ufffd\ufff d\ufffd\ufffd↑!ExifEf1gL6KM7Ij5ae0gL6KM7cH2cH2GI3 Content-Disposition: form-data; name="Filename" You are treating a binary data column as if it were a string. That's bogus, you need to use a blob column. Also I wouldn't combine the uplodaded chunks until the full upload is finished - and even then only if I actually need the data. Diez And the best solution would be to use TEXT instead or some sort of SUBBIN that i do not know of in sqlite ? No, the best solution would be to use "BLOB", and no SUB*-stuff, but instead a 1:n-relation of chunks, that when the upload is finished you can easily combine in python to one large blob, storing that in the DB again. Diez so one table of chunks CREATE TABLE temp ( file_id VARCHAR(64), chunK_id INTEGER, chunk BLOB, PRIMARY KEY(file_id,chunk_id) ); SELECT chunk FROM temp WHERE file_id = 'file' concatenating result in python update blob delete temp How do I concatenate results that do not fit into memory ? By writing them into one file? If files were to large for your memory, all the substring-stuff wouldn't help either - the sqlite works in the same memory as your program... But how many gigabytes of uploads do you expect? Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with join in__str__() in class (newbie)
MRAB wrote: Try printing self.topics. It should always be a list of topics. Ah, yes, that made me find a bug when I was creating the Expert objects: the lists of known topics were not created properly. I should have posted more code I suppose! Thanks for the help, this problem has now been solved. I guess I can't use a join to print the known experts as I described in my first post. - Fencer -- http://mail.python.org/mailman/listinfo/python-list
Monkeypatching an object to become callable
Hi, I want to monkeypatch an object so that it becomes callable, although originally it is not meant to be. (Yes, I think I do have a good reason to do so). But simply adding a __call__ attribute to the object apparently isn't enough, and I do not want to touch the class object (since it would modify all the instances): >>> class foo(object): ... pass ... >>> t = foo() >>> def test(): ... print 'bar' ... >>> t() Traceback (most recent call last): File "", line 1, in TypeError: 'foo' object is not callable >>> t.__call__ = test >>> t() Traceback (most recent call last): File "", line 1, in TypeError: 'foo' object is not callable >>> t.__call__() bar Is there an additional trick to get it to work? Best, -Nikolaus -- »Time flies like an arrow, fruit flies like a Banana.« PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C -- http://mail.python.org/mailman/listinfo/python-list
Unrecognized escape sequences in string literals
A friend of mine is just learning Python, and he's a bit tweaked about how unrecognized escape sequences are treated in Python. This is from the Python 3.0 reference manual: Unlike Standard C, all unrecognized escape sequences are left in the string unchanged, i.e., the backslash is left in the string. (This behavior is useful when debugging: if an escape sequence is mistyped, the resulting output is more easily recognized as broken.) It is also important to note that the escape sequences only recognized in string literals fall into the category of unrecognized escapes for bytes literals. My friend begs to differ with the above. It would be much better for debugging if Python generated a parsing error for unrecognized escape sequences, rather than leaving them unchanged. g++ outputs a warning for such escape sequences, for instance. This is what I would consider to be the correct behavior. (Actually, I think it should just generate a fatal parsing error, but a warning is okay too.) In any case, I think my friend should mellow out a bit, but we both consider this something of a wart. He's just more wart-phobic than I am. Is there any way that this behavior can be considered anything other than a wart? Other than the unconvincing claim that you can use this "feature" to save you a bit of typing sometimes when you actually want a backslash to be in your string? |>ouglas -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with join in__str__() in class (newbie)
> Fencer (F) wrote:
>F> Also, notice the code I've commented out. If I can get the join above to
>F> work (with your help) my next question is how to present the known experts
>F> in a comma separated list with only expert_id and name? I can't use the
>F> normal __str__() method (the one I'm writing here) because it prints too
>F> much information. Does that mean a join is out of the question?
>F> MRAB wrote:
>>> Try printing self.topics. It should always be a list of topics.
>F> Ah, yes, that made me find a bug when I was creating the Expert objects:
>F> the lists of known topics were not created properly. I should have posted
>F> more code I suppose! Thanks for the help, this problem has now been solved.
>F> I guess I can't use a join to print the known experts as I described in my
>F> first post.
Yes, you can. But you need an additional method that gives only the id
and name. Like this:
class Expert:
'''An expert'''
def __init__(self, id, name, topics):
self.expert_id = id
self.name = name
self.topics = topics
self.known_experts = []
def add_expert(self, expert):
self.known_experts.append(expert)
def __str__(self):
output = (self.brief_str() +
'\nKnown topics: %s' % (', '.join(map(str, self.topics))) +
('\nKnown experts: %s' %
(', '.join(exp.brief_str() for exp in self.known_experts
return output
def brief_str(self):
'''Gives a brief description of the expert: just the id and name.'''
return '%s:%s' % (self.expert_id, self.name)
class Topic:
'''A topic'''
def __init__(self, id, name):
self.topic_id = id
self.name = name
def __str__(self):
return '%s:%s' % (self.topic_id, self.name)
topic1 = Topic('t1', 'Relativity')
topic2 = Topic('t2', 'Math')
topic5 = Topic('t5', 'Polemics')
topic6 = Topic('t6', 'The Parthenon')
expert1 = Expert('e1', 'Albert', [topic1])
expert2 = Expert('e2', 'Leonhard', [topic2])
expert1.add_expert(expert2)
expert5 = Expert('e5', 'Carla', [topic5, topic6])
expert5.add_expert(expert1)
expert5.add_expert(expert2)
for ex in expert1, expert2, expert5:
print ex
(I prefer to use map instead of a list/iterator comprehension in this
particular case. With the known_experts that isn't possible, unless
brief_str is made into a static method)
--
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URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: p...@vanoostrum.org
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Surpressing Warnings
Hi: I get a ton of warnings like this from a program I run: Warning (from warnings module): File "C:\Python25\read.py", line 67 cursor.execute(sqlKWDrop) Warning: Unknown table 'judaism_128' How do I surpress them? TIA, Victor -- http://mail.python.org/mailman/listinfo/python-list
[ANNC] pybotwar-0.5
pybotwar is a fun and educational game where players create computer programs to control simulated robots to compete in a battle arena. http://pybotwar.googlecode.com/ pybotwar uses pybox2d for the physical simulation, and uses pygame and pygsear for the visualization. pybotwar is released under GPLv3. Changes in pybotwar-0.5: - added tournament mode - added explosive shells - robots are now damaged by colliding with walls or other robots - added damage sensor - added gyro sensor - added configurable cannon reload time - added robot statistics database - added time limit for robot startup/ initialization - health bar changes color below 30% health - fixed force/ torque possibly going over 100% - fixed problem with non-integer force/ torque values - each robot gets its own log file in test mode - send robot errors to log file - use optparse for cmd line options _ More than messages–check out the rest of the Windows Live™. http://www.microsoft.com/windows/windowslive/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Monkeypatching an object to become callable
Nikolaus Rath schrieb: Hi, I want to monkeypatch an object so that it becomes callable, although originally it is not meant to be. (Yes, I think I do have a good reason to do so). But simply adding a __call__ attribute to the object apparently isn't enough, and I do not want to touch the class object (since it would modify all the instances): class foo(object): ... pass ... t = foo() def test(): ... print 'bar' ... t() Traceback (most recent call last): File "", line 1, in TypeError: 'foo' object is not callable t.__call__ = test t() Traceback (most recent call last): File "", line 1, in TypeError: 'foo' object is not callable t.__call__() bar Is there an additional trick to get it to work? AFAIK special methods are always only evaluated on the class. But this works: class Foo(object): pass f = Foo() def make_callable(f): class Callable(f.__class__): def __call__(self): print "foobar" f.__class__ = Callable make_callable(f) f() Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Bug or feature: double strings as one
On Aug 9, 12:10 pm, "Jan Kaliszewski" wrote: ..(snip) > Sorry, you are wrong, '''-way would be usefull only if: > > * you want to have '\n' in each place where you wrap the > literal in your code, > > and > > * you use '''-literal at a module (non-indented) level > > or you need not only '\n'-s but also indentations > (dependent on indentation of your code), > > or such ugly indentation is ok for you: > > some indentated code... > prompt = '''quite long string %s quite long string > ''' quite long string quite long string %s > ''' quite %s long string quite long string > ''' > some indentated code... > > That's why I wrote it's "useless in such cases." @ Jan & Anny No, of course putting a multi-line string inside a block does not solve anything. What i meant for you to do is to declare the string outside the block or as a module level Constant. i typically declare all multi-line strings (ig for dialog prompts etc..) right after my globals at the top of my modules or within an imported module like... from thisModuleConstants import * -- http://mail.python.org/mailman/listinfo/python-list
Re: unique-ifying a list
On Aug 7, 4:53 pm, kj wrote: > Suppose that x is some list. To produce a version of the list with > duplicate elements removed one could, I suppose, do this: > > x = list(set(x)) > > but I expect that this will not preserve the original order of > elements. > > I suppose that I could write something like > > def uniquify(items): > seen = set() > ret = [] > for i in items: > if not i in seen: > ret.append(i) > seen.add(i) > return ret > > But this seems to me like such a commonly needed operation that I > find it hard to believe one would need to resort to such self-rolled > solutions. Isn't there some more standard (and hopefully more > efficient, as in "C-coded"/built-in) approach? > > TIA! > > kynn Unique items in a list, in the same order as in the list: x = sorted(set(x), key=x.index) ;] -- http://mail.python.org/mailman/listinfo/python-list
Re: Need help in configuration for TimedRotatingFileHandler
Lokesh wrote:
Hi,
Need help in configure the TimedRotatingFileHandler from configuration
file
I have tried with the below code and ended up with the error, code is
pasted below
Error - IOError: [Errno 2] No such file or directory: 'G:\\lok_sib\
\logs\rotate_test'
[loggers]
keys=root,simpleExample
[handlers]
keys=consoleHandler,timedRotatingFileHandler
[formatters]
keys=simpleFormatter
[logger_root]
level=DEBUG
handlers=consoleHandler
[logger_simpleExample]
level=DEBUG
handlers=timedRotatingFileHandler
qualname=simpleExample
propagate=0
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)
[handler_timedRotatingFileHandler]
class=handlers.TimedRotatingFileHandler
level=DEBUG
formatter=simpleFormatter
args=("G:\lok_sib\logs\rotate_test", 'midnight', 1)
[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt='%Y-%m-%d %H:%M:%S'
Thanks or your time
Regards,
Lokesh
I don't see code there, I see lots of config data, presumably in an .ini
file. So I don't know how you're reading it in, and converting it to
Python variables, but I know where I'd look, based on your error message.
The following line:
args=("G:\lok_sib\logs\rotate_test", 'midnight', 1)
seems to contain a Python string. But there are unescaped backslashes
within it. You can get away with it in two cases, because \l isn't a
valid escape sequence. But in the case of \r, it looks like a newline
character.
Anyway, all three of those backslashes probably need to be doubled.
args=("G:\\lok_sib\\logs\\rotate_test", 'midnight', 1)
Two other cures that may work, depending on context: change the backslashes
to forward slashes, or use a raw string.
But as I said earlier, you don't show in any way what code is interpreting this
line, so it's all just guesswork.
DaveA
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Re: Bug or feature: double strings as one
#-- el bueno --# "hello i am a very long string that\ does not like newlines so please \ escape me, Thank you!" #-- el malo --# "hello i am a very long string that"+ "does not like newlines but i have no"+ "idea what to do with myself" #-- el feo --# "hello i am a very long string that" "does not like newlines but i have no" "idea what to do with myself" just ideas people! -- http://mail.python.org/mailman/listinfo/python-list
How to find out in which module an instance of a class is created?
Hi I like to know in which module an instance of a class was initialized. Using __module__ or __name__ within a class only gives me the module in which the class was defined not the instance of the class. Is there some (simple) way to do this? For better understanding I'll give an example how I want to use this. Okay let's say I've got a module *foo,* in which class A is defined as the following: > class A(object): > def __init__(self, mod): > self.mod = mod In a module called *bar* I do the following: > import foo > a = A(__name__) Then a.mod should be "bar". But I don't like to pass the value of a.mod manually rather than having it default to the module the instance a of A was created in (here "bar"). Unfortunately something like this ... > class A(object): > def __init__(self, mod=__name__): > self.mod = mod ... won't work. In this case mod would always be "foo". Kind regards johannes -- http://mail.python.org/mailman/listinfo/python-list
Re: resume upload wsgi script
On Aug 9, 8:25 pm, "Diez B. Roggisch" wrote: > gert schrieb: > > > > > On Aug 9, 4:42 pm, "Diez B. Roggisch" wrote: > >> gert schrieb: > > >>> On Aug 9, 3:17 pm, "Diez B. Roggisch" wrote: > gert schrieb: > > I working on a resume upload script and encountered the following > > problems > > sql: Could not decode to UTF-8 column 'SUBSTR(picture,?)' with text > > '\ufffd\ufff > > d\ufffd\ufffd↑!ExifEf1gL6KM7Ij5ae0gL6KM7cH2cH2GI3 > > Content-Disposition: form-data; name="Filename" > You are treating a binary data column as if it were a string. That's > bogus, you need to use a blob column. > Also I wouldn't combine the uplodaded chunks until the full upload is > finished - and even then only if I actually need the data. > Diez > >>> And the best solution would be to use TEXT instead or some sort of > >>> SUBBIN that i do not know of in sqlite ? > >> No, the best solution would be to use "BLOB", and no SUB*-stuff, but > >> instead a 1:n-relation of chunks, that when the upload is finished you > >> can easily combine in python to one large blob, storing that in the DB > >> again. > > >> Diez > > > so one table of chunks > > > CREATE TABLE temp ( > > file_id VARCHAR(64), > > chunK_id INTEGER, > > chunk BLOB, > > PRIMARY KEY(file_id,chunk_id) > > ); > > > SELECT chunk FROM temp WHERE file_id = 'file' > > concatenating result in python > > update blob > > delete temp > > > How do I concatenate results that do not fit into memory ? > > By writing them into one file? If files were to large for your memory, > all the substring-stuff wouldn't help either - the sqlite works in the > same memory as your program... > > But how many gigabytes of uploads do you expect? > 250KB :) Its just HTTP1.1 has everything for making ftp like file transfers possible. When I write it to a file then I am back at square one because I still need to load it completely to get it into a blob. So there is no way to concatenate BLOB's without loading it completely into memory ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Monkeypatching an object to become callable
On Aug 9, 12:02 pm, Nikolaus Rath wrote:
> Hi,
>
> I want to monkeypatch an object so that it becomes callable, although
> originally it is not meant to be. (Yes, I think I do have a good reason
> to do so).
>
> But simply adding a __call__ attribute to the object apparently isn't
> enough, and I do not want to touch the class object (since it would
> modify all the instances):
Override the class's __call__, and program it to call a certain method
(say _instancecall) on the object. Catch AttributeError and raise
TypeError so that it matches the behavior when no __call__ is defined.
def __call__(self,*args,**kwargs):
try:
func = self._instancecall
except AttributeError:
raise TypeError("'%s' object not callable" % self.__class__)
return func(*args,**kwargs)
Note: don't call _instancecall inside the try clause; you don't want
to catch attribute errors raised inside the _instancecall method.
Then set _instancecall on any objects you want to be callable.
Carl Banks
--
http://mail.python.org/mailman/listinfo/python-list
Re: Surpressing Warnings
On Sun, Aug 9, 2009 at 4:21 PM, Victor Subervi wrote:
> Hi:
> I get a ton of warnings like this from a program I run:
>
> Warning (from warnings module):
> File "C:\Python25\read.py", line 67
> cursor.execute(sqlKWDrop)
> Warning: Unknown table 'judaism_128'
>
> How do I surpress them?
import warnings
with warnings.catch_warnings():
warnings.simplefilter("ignore")
cursor.execute(sqlKWDrop)
#repeat for every call that's causing warnings
or to just silence all warnings from anywhere:
import warnings
warnings.simplefilter("ignore")
Cheers,
Chris
--
http://blog.rebertia.com
--
http://mail.python.org/mailman/listinfo/python-list
Re: Bug or feature: double strings as one
09-08-2009 o 23:43:14 r wrote: #-- el bueno --# "hello i am a very long string that\ does not like newlines so please \ escape me, Thank you!" You probably ment: """hello i am... [etc.] Anyway... You're right that generally it's good idea to define dialog prompts and such stuff separately rather that to hardcode it, especially in big projects. Then certainly multiline string literals are useful (though, if you need to get rid of newlines, IMHO "el feo" method is more elegant and less error prone than your "el bueno" [possible invisible space after '\']). But there are plenty of other situations when it's better (in practice) to have strings (even long) together with your code, e.g. log information for debugging, or Cheers, *j -- http://mail.python.org/mailman/listinfo/python-list
Re: How to find out in which module an instance of a class is created?
Johannes Janssen wrote: > class A(object): > def __init__(self, mod=__name__): > self.mod = mod won't work. In this case mod would always be "foo". You have to inspect the stack in order to get the module of the caller. The implementation of warnings.warn() gives you some examples how to get the module name. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Does python have the capability for driver development ? Maybe with ShedSkin
MalC0de wrote: hello there, I've a question : I want to know does python have any capability for using Ring0 and kernel functions for driver and device development stuff . if there's such a feature it is very good, and if there something for this kind that you know please refer me to some reference and show me some snippet . thanks - Malc0de With the CPython interpretive system, it's not likely to work. But using ShedSkin, which generates hard machine code, it might be possible. The main problem is that Shed Skin uses a garbage-collected environment, which few kernels have. Under QNX, which is a a real message-passing operating system with all drivers in user space, it should be possible to write a driver in Python. There's Python for QNX. It would probably be too slow to be useful, though. I've actually written a handler for Baudot Teletype machines in Python. See https://sourceforge.net/projects/baudotrss/ Those machines are so slow (45.45 baud) that Python isn't the bottleneck. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: Bug or feature: double strings as one
Jan Kaliszewski wrote: 09-08-2009 o 23:43:14 r wrote: #-- el bueno --# "hello i am a very long string that\ does not like newlines so please \ escape me, Thank you!" You probably ment: """hello i am... [etc.] Anyway... You're right that generally it's good idea to define dialog prompts and such stuff separately rather that to hardcode it, especially in big projects. Then certainly multiline string literals are useful (though, if you need to get rid of newlines, IMHO "el feo" method is more elegant and less error prone than your "el bueno" [possible invisible space after '\']). But there are plenty of other situations when it's better (in practice) to have strings (even long) together with your code, e.g. log information for debugging, or Here's an idea that you're probably going to hate: indented strings. :-) A string prefixed with 'i' would be an 'indented' string. Leading space and tab characters at the start of the string (just after the quote) or the start of each line within a multiline string would be ignored. >>> """Line 1 Line 2 """ 'Line 1\n Line 2\n' >>> i"""Line 1 Line 2 """ 'Line 1\nLine 2\n' An additional feature could be to make '\ ' == ' ', perhaps only for indented strings if you're worried that it could breaking existing code: >>> i"""Line 1 \ Line 2 """ 'Line 1\n Line 2\n' This would save you having to write '\x20'. -- http://mail.python.org/mailman/listinfo/python-list
Re: Unrecognized escape sequences in string literals
On Sun, 09 Aug 2009 12:26:54 -0700, Douglas Alan wrote: > A friend of mine is just learning Python, and he's a bit tweaked about > how unrecognized escape sequences are treated in Python. ... > In any case, I think my friend should mellow out a bit, but we both > consider this something of a wart. He's just more wart-phobic than I am. > Is there any way that this behavior can be considered anything other > than a wart? Other than the unconvincing claim that you can use this > "feature" to save you a bit of typing sometimes when you actually want a > backslash to be in your string? I'd put it this way: a backslash is just an ordinary character, except when it needs to be special. So Python's behaviour is "treat backslash as a normal character, except for these exceptions" while the behaviour your friend wants is "treat a backslash as an error, except for these exceptions". Why should a backslash in a string literal be an error? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Monkeypatching an object to become callable
On Aug 9, 1:02 pm, Nikolaus Rath wrote: > Hi, > > I want to monkeypatch an object so that it becomes callable, although > originally it is not meant to be. (Yes, I think I do have a good reason > to do so). > > But simply adding a __call__ attribute to the object apparently isn't > enough, and I do not want to touch the class object (since it would > modify all the instances): > > >>> class foo(object): > > ... pass > ...>>> t = foo() > >>> def test(): > > ... print 'bar' > ...>>> t() > > Traceback (most recent call last): > File "", line 1, in > TypeError: 'foo' object is not callable>>> t.__call__ = test > >>> t() > > Traceback (most recent call last): > File "", line 1, in > TypeError: 'foo' object is not callable>>> t.__call__() > > bar > > Is there an additional trick to get it to work? > > Best, > > -Nikolaus > > -- > »Time flies like an arrow, fruit flies like a Banana.« > > PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C With an old-style class your code will work: class A: pass def test(): print "test" a = A() a.__call__ = test a() --output:-- test a2 = A() a2() --output:-- a2() AttributeError: A instance has no __call__ method Another option is to use the *decorator pattern*. The decorator pattern can be used when you want to add additional methods and attributes to an object, and you don't want to disturb the original class: class A(object): def __init__(self, x): self.x = x def sayhi(self): print "hi" class Wrapper(object): def __init__(self, obj, func): self.obj = obj self.func = func def __call__(self, *args): return self.func(*args) def __getattr__(self, name): return object.__getattribute__(self.obj, name) def test(): print "test" a = A(10) w = Wrapper(a, test) w() print w.x w.sayhi() --output:-- test 10 hi -- http://mail.python.org/mailman/listinfo/python-list
Re: Unrecognized escape sequences in string literals
Steven D'Aprano wrote: > Why should a backslash in a string literal be an error? Because in Python, if my friend sees the string "foo\xbar\n", he has no idea whether the "\x" is an escape sequence, or if it is just the characters "\x", unless he looks it up in the manual, or tries it out in the REPL, or what have you. My friend is adamant that it would be better if he could just look at the string literal and know. He doesn't want to be bothered to have to store stuff like that in his head. He wants to be able to figure out programs just by looking at them, to the maximum degree that that is feasible. In comparison to Python, in C++, he can just look "foo\xbar\n" and know that "\x" is a special character. (As long as it compiles without warnings under g++.) He's particularly annoyed too, that if he types "foo\xbar" at the REPL, it echoes back as "foo\\xbar". He finds that to be some sort of annoying DWIM feature, and if Python is going to have DWIM features, then it should, for example, figure out what he means by "\" and not bother him with a syntax error in that case. Another reason that Python should not behave the way that it does, is that it pegs Python into a corner where it can't add new escape sequences in the future, as doing so will break existing code. Generating a syntax error instead for unknown escape sequences would allow for future extensions. Now not to pick on Python unfairly, most other languages have similar issues with escape sequences. (Except for the Bourne Shell and bash, where "\x" always just means "x", no matter what character "x" happens to be.) But I've been telling my friend for years to switch to Python because of how wonderful and consistent Python is in comparison to most other languages, and now he seems disappointed and seems to think that Python is just more of the same. Of course I think that he's overreacting a bit. My point of view is that every language has *some* warts; Python just has a bit fewer than most. It would have been nice, I should think, if this wart had been "fixed" in Python 3, as I do consider it to be a minor wart. |>ouglas -- http://mail.python.org/mailman/listinfo/python-list
Re: Unrecognized escape sequences in string literals
On Aug 9, 5:06 pm, Steven D'Aprano wrote: > On Sun, 09 Aug 2009 12:26:54 -0700, Douglas Alan wrote: > > A friend of mine is just learning Python, and he's a bit tweaked about > > how unrecognized escape sequences are treated in Python. > ... > > In any case, I think my friend should mellow out a bit, but we both > > consider this something of a wart. He's just more wart-phobic than I am. > > Is there any way that this behavior can be considered anything other > > than a wart? Other than the unconvincing claim that you can use this > > "feature" to save you a bit of typing sometimes when you actually want a > > backslash to be in your string? > > I'd put it this way: a backslash is just an ordinary character, except > when it needs to be special. So Python's behaviour is "treat backslash as > a normal character, except for these exceptions" while the behaviour your > friend wants is "treat a backslash as an error, except for these > exceptions". > > Why should a backslash in a string literal be an error? Because the behavior of \ in a string is context-dependent, which means a reader can't know if \ is a literal character or escape character without knowing the context, and it means an innocuous change in context can cause a rather significant change in \. IOW it's an error-prone mess. It would be better if Python (like C) treated \ consistently as an escape character. (And in raw strings, consistently as a literal.) It's kind of a minor issue in terms of overall real-world importance, but in terms of raw unPythonicness this might be the worst offense the language makes. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: pybotwar-0.5
On Aug 9, 3:26 pm, Lee Harr wrote: > pybotwar is a fun and educational game where players > create computer programs to control simulated robots > to compete in a battle arena. > > http://pybotwar.googlecode.com/ Why is the doc folder empty? Shouldn't you supply some hint on how the games works and at least a rudimentary guide to robot design? What version to you expect that will be in? 1.0? 10.0? Could you inform us when you have something worth looking at and not before so we don't have to waste our time? > > pybotwar uses pybox2d for the physical simulation, > and uses pygame and pygsear for the visualization. > > pybotwar is released under GPLv3. > > Changes in pybotwar-0.5: > - added tournament mode > - added explosive shells > - robots are now damaged by colliding with walls or other robots > - added damage sensor > - added gyro sensor > - added configurable cannon reload time > - added robot statistics database > - added time limit for robot startup/ initialization > - health bar changes color below 30% health > - fixed force/ torque possibly going over 100% > - fixed problem with non-integer force/ torque values > - each robot gets its own log file in test mode > - send robot errors to log file > - use optparse for cmd line options > > _ > More than messages–check out the rest of the Windows > Live™.http://www.microsoft.com/windows/windowslive/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Unrecognized escape sequences in string literals
On Aug 9, 8:06 pm, Steven D'Aprano wrote: > while the behaviour your > friend wants is "treat a backslash as an error, except for these > exceptions". Besides, can't all error situations be described as, "treat the error situation as an error, except for the exception of when the situation isn't an error"??? The behavior my friend wants isn't any more exceptional than that! |>ouglas -- http://mail.python.org/mailman/listinfo/python-list
Social problems of Python doc [was Re: Python docs disappointing]
The prob with python docs is with the python priests. there are frequent posts about python doc's poor quality, and some efforts to improve the doc (such as wiki or seggestions), about few times a year (in so much as i've seen), the typical response is pissing fight, with python priests to tell them not to start another wiki, or “you should apply in our church first and formulate a PEP proposal first or kindly donate or otherwise fuckoff”, and so on. i've wrote several articles about this issue, total time spend on this is probably more than 2 months full-time work. See: • Python Documentation Problems http://xahlee.org/perl-python/python_doc_index.html just about each article above generates a thread of flames. I also have re-wrote the entire python regex doc in 2005: • Pyhton Regex Documentation: String Pattern Matching http://xahlee.org/perl-python/python_re-write/lib/module-re.html there are some positive reviews, but most are drawn out by nay-sayers. I often receive thank you emails for 2 particular articles, which are most frequently google searched as indicated by my weblog: • Python Doc Problem Example: gzip http://xahlee.org/perl-python/python_doc_gzip.html • Python Doc Problem Example: sort() http://xahlee.org/perl-python/python_doc_sort.html • Sorting in Python and Perl http://xahlee.org/perl-python/sort_list.html See also: • Language, Purity, Cult, and Deception http://xahlee.org/UnixResource_dir/writ/lang_purity_cult_deception.html Xah ∑ http://xahlee.org/ ☄ On Jul 31, 1:10 pm, kj wrote: > I'm pretty new to Python, and I like a lot overall, but I find the > documentation for Python rather poor, overall. > > I'm sure that Python experts don't have this problem: they have > internalized some good ways to access the documentation, are > productive with it, and therefore have lost the ability to see why > the Python documentations is deficient for beginners. This explains > why a suboptimal situation can persist like this: those who are > most able fix it are also the least able to perceive it. > > I've heard similar complaints from other experienced programmers > who are trying out Python for the first time: poor documentation. > > Here is an *entirely typical* example: on some Unix, try > > % pydoc urllib > > The displayed documentation mention the optional parameter "data" > in practically every function listed (a few dozen of them). This > parameter is not documented *anywhere* on that page. All that we > are told is that its default value is always None. > > I'm sure that I can find a full description of this parameter if > I fire up Google, and search online. In fact, more likely than > not, I'll find far more documentation than I want. But my point > is that a programmer should not need to do this. The full > documentation should be readily accessible directly through a few > keystrokes. > > I would love to know how experienced Python programmers quickly > zero in on the Python documentation they need. > > TIA! > > kynn -- http://mail.python.org/mailman/listinfo/python-list
reloading the module imported as 'from ... import ...'
Hi, what is the best way to reload the module imported using 'from ... import ...' Is following a way to do so? >>> from email.charset import Charset >>> reload(email.charset) Traceback (most recent call last): File "", line 1, in NameError: name 'email' is not defined >>> >>> >>> import email.charset >>> reload(email.charset) Probably it works but I do not like it as I end up with two namespaces for the symbol Charset: email.charset.Charset and Charset Thx, A. -- http://mail.python.org/mailman/listinfo/python-list
Re: Social problems of Python doc [was Re: Python docs disappointing]
Since you're talking about documentation, which is a part of python, don't you think you should be discussing it on python-dev ? That's where discussions about the documentation should be held. haha - I'm just curious to see how long it will for them to shut the discussion down. Before you do that, you should clearly work out in your own mind how you think things need to improve. It's not good enough just saying this or that is bad without having specific ideas on what needs to change. Good luck fellow sinner and blasphemer... How dare you suggest that things could be improved... On Sun, 9 Aug 2009 20:04:43 -0700 (PDT), Xah Lee wrote: > The prob with python docs is with the python priests. > > there are frequent posts about python doc's poor quality, and some > efforts to improve the doc (such as wiki or seggestions), about few > times a year (in so much as i've seen), the typical response is > pissing fight, with python priests to tell them not to start another > wiki, or “you should apply in our church first and formulate a PEP > proposal first or kindly donate or otherwise fuckoff”, and so on. > > i've wrote several articles about this issue, total time spend on this > is probably more than 2 months full-time work. See: > > • Python Documentation Problems > http://xahlee.org/perl-python/python_doc_index.html > > just about each article above generates a thread of flames. > > I also have re-wrote the entire python regex doc in 2005: > > • Pyhton Regex Documentation: String Pattern Matching > http://xahlee.org/perl-python/python_re-write/lib/module-re.html > > there are some positive reviews, but most are drawn out by nay-sayers. > > I often receive thank you emails for 2 particular articles, which are > most frequently google searched as indicated by my weblog: > > • Python Doc Problem Example: gzip > http://xahlee.org/perl-python/python_doc_gzip.html > > • Python Doc Problem Example: sort() > http://xahlee.org/perl-python/python_doc_sort.html > > • Sorting in Python and Perl > http://xahlee.org/perl-python/sort_list.html > > See also: > > • Language, Purity, Cult, and Deception > http://xahlee.org/UnixResource_dir/writ/lang_purity_cult_deception.html > > Xah > ∑ http://xahlee.org/ > > ☄ > > On Jul 31, 1:10 pm, kj wrote: >> I'm pretty new to Python, and I like a lot overall, but I find the >> documentation for Python rather poor, overall. >> >> I'm sure that Python experts don't have this problem: they have >> internalized some good ways to access the documentation, are >> productive with it, and therefore have lost the ability to see why >> the Python documentations is deficient for beginners. This explains >> why a suboptimal situation can persist like this: those who are >> most able fix it are also the least able to perceive it. >> >> I've heard similar complaints from other experienced programmers >> who are trying out Python for the first time: poor documentation. >> >> Here is an *entirely typical* example: on some Unix, try >> >> % pydoc urllib >> >> The displayed documentation mention the optional parameter "data" >> in practically every function listed (a few dozen of them). This >> parameter is not documented *anywhere* on that page. All that we >> are told is that its default value is always None. >> >> I'm sure that I can find a full description of this parameter if >> I fire up Google, and search online. In fact, more likely than >> not, I'll find far more documentation than I want. But my point >> is that a programmer should not need to do this. The full >> documentation should be readily accessible directly through a few >> keystrokes. >> >> I would love to know how experienced Python programmers quickly >> zero in on the Python documentation they need. >> >> TIA! >> >> kynn -- http://mail.python.org/mailman/listinfo/python-list
Re: Need help in configuration for TimedRotatingFileHandler
Hi Dave,
I have modified the code as mentioned in reply and is working fine. But
still i am facing an issue and the issue is described below.
In configuration file i have coded the TimedRotatingFileHandler like
args=("G:\\lok_sib\\logs\\rotate_test", 'D', 1)
step1: Executed the code and got the log file with the information
step2: Modified the system time from current day to next day
step3: End up with the error and the error is pasted below
Traceback (most recent call last):
File "c:\Python25\lib\logging\handlers.py", line 74, in emit
self.doRollover()
File "c:\Python25\lib\logging\handlers.py", line 274, in doRollover
os.rename(self.baseFilename, dfn)
WindowsError: [Error 32] The process cannot access the file because it is
being used by another process
Python version - 2.5.4
Thanks for your time.
Regards,
Lokesh
On Mon, Aug 10, 2009 at 2:45 AM, Dave Angel wrote:
> Lokesh wrote:
>
>> Hi,
>>
>> Need help in configure the TimedRotatingFileHandler from configuration
>> file
>>
>> I have tried with the below code and ended up with the error, code is
>> pasted below
>> Error - IOError: [Errno 2] No such file or directory: 'G:\\lok_sib\
>> \logs\rotate_test'
>> [loggers]
>> keys=root,simpleExample
>>
>> [handlers]
>> keys=consoleHandler,timedRotatingFileHandler
>>
>> [formatters]
>> keys=simpleFormatter
>>
>> [logger_root]
>> level=DEBUG
>> handlers=consoleHandler
>>
>> [logger_simpleExample]
>> level=DEBUG
>> handlers=timedRotatingFileHandler
>> qualname=simpleExample
>> propagate=0
>>
>> [handler_consoleHandler]
>> class=StreamHandler
>> level=DEBUG
>> formatter=simpleFormatter
>> args=(sys.stdout,)
>>
>> [handler_timedRotatingFileHandler]
>> class=handlers.TimedRotatingFileHandler
>> level=DEBUG
>> formatter=simpleFormatter
>> args=("G:\lok_sib\logs\rotate_test", 'midnight', 1)
>>
>> [formatter_simpleFormatter]
>> format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
>> datefmt='%Y-%m-%d %H:%M:%S'
>>
>>
>> Thanks or your time
>> Regards,
>> Lokesh
>>
>>
>>
> I don't see code there, I see lots of config data, presumably in an .ini
> file. So I don't know how you're reading it in, and converting it to
> Python variables, but I know where I'd look, based on your error message.
>
> The following line:
>
> args=("G:\lok_sib\logs\rotate_test", 'midnight', 1)
>
> seems to contain a Python string. But there are unescaped backslashes
> within it. You can get away with it in two cases, because \l isn't a valid
> escape sequence. But in the case of \r, it looks like a newline character.
>
> Anyway, all three of those backslashes probably need to be doubled.
>
> args=("G:\\lok_sib\\logs\\rotate_test", 'midnight', 1)
>
> Two other cures that may work, depending on context: change the
> backslashes to forward slashes, or use a raw string.
>
> But as I said earlier, you don't show in any way what code is interpreting
> this line, so it's all just guesswork.
>
> DaveA
>
>
--
Thanks & Regards,
Lokesh.
lokeshmarema...@gmail.com
--
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Re: Need help in configuration for TimedRotatingFileHandler
Hi Dave,
I forgot to provide the information about the code how I am using logger
Here is the complete scenario
I have modified the code as mentioned in reply and is working fine. But
still I am facing an issue and the issue is described below.
In configuration file i have coded the TimedRotatingFileHandler like
args=("G:\\lok_sib\\logs\\rotate_test", 'D', 1)
Code:
mlogger = logging.getLogger("simpleExample")
def a_view(request):
mlogger.debug("a_view called")
if request.method== "POST" :
mlogger.debug("post function")
else:
mlogger.debug("serve function")
Execution:
step1: Executed the code and got the log file with the information
step2: Modified the system time from current day to next day
step3: End up with the error and the error is pasted below
Traceback (most recent call last):
File "c:\Python25\lib\logging\handlers.py", line 74, in emit
self.doRollover()
File "c:\Python25\lib\logging\handlers.py", line 274, in doRollover
os.rename(self.baseFilename, dfn)
WindowsError: [Error 32] The process cannot access the file because it is
being used by another process
Python version - 2.5.4
I guess my output should be like this for the next day
-a new log file rotate_test. should generate in the respective
location
Please correct me if I am wrong.
Thanks for your time.
Regards,
Lokesh
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Re: Using Python to automate builds
Kosta wrote: > > >What I would like to do, is to open a cmd window, and start a Python >script. This script would then (based upon input arguments), build >different flavors of the driver (fre, chk, x86, x64) and do some post >processing (create cat files, sign, etc.). > >I was hoping to take advantage as much as possible of exisiting >infrastructure from the WDK. I am able to call setenv.bat and provide >all the input parameters. One of the things setenv.bat does is change >the path environment variable. However, this is not captured by >Python. I could duplicate the functionality, but I'd rather not. Is >there a way to capture all enviroment variable changes being made by a >batch file from Python? My suggestion is that you just call "setenv" again every time you start a new process. My "build everything" batch file has a series of sections something like this: setlocal set LAST=%CD% call %DDK%\bin\setenv %DDK% chk WXP no_oacr @echo on set USERNAME=timr cd %LAST% build %BLD% endlocal setlocal set LAST=%CD% call %DDK%\bin\setenv %DDK% fre WXP no_oacr @echo on set USERNAME=timr cd %LAST% build %BLD% endlocal setlocal set LAST=%CD% call %DDK%\bin\setenv %DDK% chk WLH x64 no_oacr @echo on set USERNAME=timr cd %LAST% build %BLD% endlocal -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: reloading the module imported as 'from ... import ...'
On Sun, 09 Aug 2009 20:43:41 -0700, AlF wrote: > Hi, > > what is the best way to reload the module imported using 'from ... > import ...' Have you tried "from ... import ..." again? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Pywin32 @ windows 7
"Algirdas Brazas" wrote: > >Did anyone manage to get windows extensions installet on windows 7 64 bit? As >far as I try I get only "Setup program invalid or damaged". I've been running 32-bit Python 2.5 and the 32-bit versions of PyWin32 and wxPython on Windows 7 64-bit for many months. No problems. I have not tried the 64-bit Python and PyWin32 builds yet. -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows 7 : any problems installing or running Python ?
Dave WB3DWE wrote: > >Anybody tried it ? >Is anything broken, ie is the whole shootin' match good to go ? >I'm esp interested in WConio for 3.0/3.1 which I use heavily. I've been running the 32-bit builds of Python 2.5, PyWin32, and wxPython on Windows 7 64-bit for many months. No problems at all. I hated Vista; I would only run it if my clients insisted on having their drivers tested on it. Vista SP1 was somewhat better, but I don't mind Windows 7 at all. I might even upgrade my primary development machine from XP. A number of the usually cranky driver developers have expressed the same opinion. Microsoft might actually have a winner here. -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: reloading the module imported as 'from ... import ...'
Steven D'Aprano wrote: On Sun, 09 Aug 2009 20:43:41 -0700, AlF wrote: Hi, what is the best way to reload the module imported using 'from ... import ...' Have you tried "from ... import ..." again? I have not because of an assumption that "import" imports the module just once. In fact this still works that way: here is a terminal 1: $ cat > a.py a=1 $ cat > a.py a=2 $ and terminal 2: >>> from a import a >>> a 1 >>> a 1 >>> from a import a >>> a 1 >>> In spite of changing a.py in fly, the imported a is still 1 -- http://mail.python.org/mailman/listinfo/python-list
Re: Client/Server based on SocketServer and Windows
Thank you Dennis I'm using 2 differents editor, which may be the cause of such a mess in the indentation. I must admitt that I lazily rely on those (not so bad indeed) editors. "If indentation whas bad they would have tell me" Too bad am i Won't post misindeted code anymore. -- http://mail.python.org/mailman/listinfo/python-list
Re: Unrecognized escape sequences in string literals
Carl Banks wrote: IOW it's an error-prone mess. It would be better if Python (like C) treated \ consistently as an escape character. (And in raw strings, consistently as a literal.) Agreed. For one thing, if another escape character ever has to be added to the language, that may change the semantics of previously correct strings. If "\" followed by a non-special character is treated as an error, that doesn't happen. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: Unrecognized escape sequences in string literals
On Sun, 09 Aug 2009 17:56:55 -0700, Douglas Alan wrote:
> Steven D'Aprano wrote:
>
>> Why should a backslash in a string literal be an error?
>
> Because in Python, if my friend sees the string "foo\xbar\n", he has no
> idea whether the "\x" is an escape sequence, or if it is just the
> characters "\x", unless he looks it up in the manual, or tries it out in
> the REPL, or what have you.
Fair enough, but isn't that just another way of saying that if you look
at a piece of code and don't know what it does, you don't know what it
does unless you look it up or try it out?
> My friend is adamant that it would be better
> if he could just look at the string literal and know. He doesn't want to
> be bothered to have to store stuff like that in his head. He wants to be
> able to figure out programs just by looking at them, to the maximum
> degree that that is feasible.
I actually sympathize strongly with that attitude. But, honestly, your
friend is a programmer (or at least pretends to be one *wink*). You can't
be a programmer without memorizing stuff: syntax, function calls, modules
to import, quoting rules, blah blah blah. Take C as an example -- there's
absolutely nothing about () that says "group expressions or call a
function" and {} that says "group a code block". You just have to
memorize it. If you don't know what a backslash escape is going to do,
why would you use it? I'm sure your friend isn't in the habit of randomly
adding backslashes to strings just to see whether it will still compile.
This is especially important when reading (as opposed to writing) code.
You read somebody else's code, and see "foo\xbar\n". Let's say you know
it compiles without warning. Big deal -- you don't know what the escape
codes do unless you've memorized them. What does \n resolve to? chr(13)
or chr(97) or chr(0)? Who knows?
Unless you know the rules, you have no idea what is in the string.
Allowing \y to resolve to a literal backslash followed by y doesn't
change that. All it means is that some \c combinations return a single
character, and some return two.
> In comparison to Python, in C++, he can just look "foo\xbar\n" and know
> that "\x" is a special character. (As long as it compiles without
> warnings under g++.)
So what you mean is, he can just look at "foo\xbar\n" AND COMPILE IT
USING g++, and know whether or not \x is a special character.
[sarcasm] Gosh. That's an enormous difference from Python, where you have
to print the string at the REPL to know what it does. [/sarcasm]
Aside:
\x isn't a special character:
>>> "\x"
ValueError: invalid \x escape
However, \xba is:
>>> "\xba"
'\xba'
>>> len("\xba")
1
>>> ord("\xba")
186
> He's particularly annoyed too, that if he types "foo\xbar" at the REPL,
> it echoes back as "foo\\xbar". He finds that to be some sort of annoying
> DWIM feature, and if Python is going to have DWIM features, then it
> should, for example, figure out what he means by "\" and not bother him
> with a syntax error in that case.
Now your friend is confused. This is a good thing. Any backslash you see
in Python's default string output is *always* an escape:
>>> "a string with a 'proper' escape \t (tab)"
"a string with a 'proper' escape \t (tab)"
>>> "a string with an 'improper' escape \y (backslash-y)"
"a string with an 'improper' escape \\y (backslash-y)"
The REPL is actually doing him a favour. It always escapes backslashes,
so there is no ambiguity. A backslash is displayed as \\, any other \c is
a special character.
> Of course I think that he's overreacting a bit.
:)
> My point of view is that
> every language has *some* warts; Python just has a bit fewer than most.
> It would have been nice, I should think, if this wart had been "fixed"
> in Python 3, as I do consider it to be a minor wart.
And if anyone had cared enough to raise it a couple of years back, it
possibly might have been.
--
Steven
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Re: Unrecognized escape sequences in string literals
On Sun, 09 Aug 2009 18:34:14 -0700, Carl Banks wrote: >> Why should a backslash in a string literal be an error? > > Because the behavior of \ in a string is context-dependent, which means > a reader can't know if \ is a literal character or escape character > without knowing the context, and it means an innocuous change in context > can cause a rather significant change in \. *Any* change in context is significant with escapes. "this \nhas two lines" If you change the \n to a \t you get a significant difference. If you change the \n to a \y you get a significant difference. Why is the first one acceptable but the second not? > IOW it's an error-prone mess. I've never had any errors caused by this. I've never seen anyone write to this newsgroup confused over escape behaviour, or asking for help with an error caused by it, and until this thread, never seen anyone complain about it either. Excuse my cynicism, but I believe that you are using "error-prone" to mean "I don't like this behaviour" rather than "it causes lots of errors". -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: reloading the module imported as 'from ... import ...'
On Sun, 09 Aug 2009 22:48:31 -0700, AlF wrote: > Steven D'Aprano wrote: >> On Sun, 09 Aug 2009 20:43:41 -0700, AlF wrote: >> >>> Hi, >>> >>> what is the best way to reload the module imported using 'from ... >>> import ...' >> >> >> Have you tried "from ... import ..." again? >> >> > I have not because of an assumption that "import" imports the module > just once. Ah, of course the cached module will still reflect the older version. Sorry, I was thinking about solving a different problem: - In module "main" call "from A import a" - Some other part of your code modifies A.a - You want to have the imported a be refreshed with the value of A.a No, my suggestion won't help in this situation. Instead, you can: (1) Delete the module from sys.modules, forcing Python to re-read it from disk: import sys del sys.modules['A'] from A import a or (2) Recognize that Python doesn't specifically support what you're trying to do. reload() is a convenience function, and you probably should stick to the "import A; A.a" form. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Unrecognized escape sequences in string literals
On Sun, 09 Aug 2009 23:03:14 -0700, John Nagle wrote: > if another escape character ever has to be > added to the language, that may change the semantics of previously > correct strings. And that's the only argument in favour of prohibiting non-special backslash sequences I've seen yet that is even close to convincing. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
