Embed Python
Hi, Background: Im currently working on my own Python port for VxWorks this is part of my master thesis. What I want to do is to only to embed the interpreter and not the compiler. Both to save memory on the target device and to be get some security in the device. It is a mission critical device im applying it to. Question: Is there any obvious way to see what files that are needed for the interpreter and which files that are needed by the compiler? //Tommy -- http://mail.python.org/mailman/listinfo/python-list
Re: tree functions daily exercise
[EMAIL PROTECTED] wrote: > K! > http://en.wikipedia.org/wiki/K_programming_language > > Interesting. > Looking at your program, they are so short. I don't know if they are > full implementation or what... That's no surprise: list and tree processing are often built right into more expressive languages, and K seems to be one of these. Regards, Jo -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Paul Rubin wrote: >As what must be penance for something or other, I'm needing to release >a Python app for use under Windows XP. Please be gentle with me since >I'm a Un*x weenie and the only thing I've had much practice with under >Windows is rebooting it. > >My app contains three different programs (say alice.py, bob.py, and >carol.py) that need to be independently launchable, and a dozen or so >other .py files that get imported into those first three. What I'd >really really like is to make a single installer called (say) >"app.exe". Launching app.exe should completely install Python, unpack >all the necessary modules, and make three icons (alice, bob, carol) on >the desktop. > >I know there's various ways of building Windows distros like that, but >am not sure what's currently preferred. Gordon McMillan's site >www.mcmillan-inc.com has had its domain expire (he really should renew >it before some squatter grabs it!) and the mirror that I've found >indicates that it was last updated for Python 2.3. I wrote my app >under 2.4 and while I don't think I depend heavily on any 2.4 >features, I'd rather not have to downgrade just to make this exe >installer. There's also py2exe--is that as good? > >Also, what's the preferred way of releasing updates? That is, let's >say I want to update my .py files and release a new version fairly >frequently--should I just make a new .exe every time? Would launching >the new one cleanly overwrite or uninstall the old one? Total >coolness would be a way to ship an "update.py" along with the app, >that syncs the app up to a Subversion repository, but that may be >asking a bit much. > >I do have Visual C++ installed on the development machine, if that helps > > i have just gone through this process myself. if your sure your only distributing the app to windows xp system, then it's perfectly possible to update from an svn by using pysvn. pysvn doesn't currently work on win9x clients. py2exe - use it, it's damn good. it puts all your library's in a library.zip file which can then use to update your app. make a nice neat installer using NSIS, you can even use it to send manual patches if you need to. if you need any help making the pysvn or other parts work give me an email i can help. -- http://mail.python.org/mailman/listinfo/python-list
Re: Anyway to designating the encoding of the "source" for compile?
[EMAIL PROTECTED] wrote:
> Thank you but there is still a problem.
>
> |>>> s='euckr="\xc7\xd1";uni=u"\xc7\xd1"'
> |>>> su=s.decode('euc-kr')
> |>>> su
> |u'euckr="\ud55c";uni=u"\ud55c"'
su[7] is a non-ascii character inside the byte string euckr
> |>>> c=compile(su,'','single')
> |>>> exec c
> |>>> euckr,uni
> |('\xed\x95\x9c', u'\ud55c')
> |>>>
>
> As you see the single's result is turned into UTF-8 encoding.
See my previous message. Non-ascii characters in byte strings
are deprecated.
Serge.
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[no subject]
To whom it may concern, I am looking to start a python organization in Iran from scrtch, Please help me with it, or give me the mailing address of a reson which is advanced/experienced in what I try to achieve. best regards Mesean Dehmand __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Like Christ PBBUH Prayed
> "George" == George Sakkis <[EMAIL PROTECTED]> writes: George> "flamesrock" wrote: >> I don't understand.. why is everyone talking about christ on >> comp.lang.python? Isn't this not the place? >> George> Maybe they know something we don't. The information is generally reserved for 34DEG pythonistas. All will be cleared for lower degree aspirants in due time. -- Ville Vainio http://tinyurl.com/2prnb -- http://mail.python.org/mailman/listinfo/python-list
Re: python 2.3.4, cx_Oracle 4.1 and utf-8 - trouble
Maxim Kuleshov wrote:
> Hello!
>
> Trying to fetch long varchar2 column and get the following error:
>
> cx_Oracle.DatabaseError: column at array pos 0 fetched with error:
1406
>
> i.e. string buffer is not much enough to fetch the string.
>
> # fragment of code...
> myCon = cx_Oracle.connect(user, psw, dsn)
> myCur = myCon.cursor()
> myCur.execute("""
> select COLUMN from TABLE where ID=1
> """)
> for record in myCur.fetchall():
> # ...
>
> Error is reproduced only if actual string value longer than half of
> declared column size. For short strings all is ok.
>
> If I print myCur.description, I get:
>
> [('COLUMN', , 250, 250, 0, 0, 1)]
>
> 250 - declared column max size, but I guess cx_Oracle allocates only
250
> bytes(!), so if my string longer than 125 chars (utf-8 national char
> occupies > 1 byte) - I get the error.
>
> Is it bug or what? Any suggestions?
Googling for "varchar2 utf-8" suggests that it's an Oracle's
feature (or issue). varchar2 is allocated in bytes. Finding
out the largest number of bytes per character is left as
an exercise :)
Sergey.
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Re: Windows distribution suggestions?
Paul Rubin wrote: > As what must be penance for something or other, I'm needing to release > a Python app for use under Windows XP. Please be gentle with me since > I'm a Un*x weenie and the only thing I've had much practice with under > Windows is rebooting it. I can feel your unhappiness, and I share it. Hi Paul! Here are some hints... > My app contains three different programs (say alice.py, bob.py, and > carol.py) that need to be independently launchable, and a dozen or so > other .py files that get imported into those first three. What I'd > really really like is to make a single installer called (say) > "app.exe". Launching app.exe should completely install Python, unpack > all the necessary modules, and make three icons (alice, bob, carol) on > the desktop. Since your installer needs to run before Python is installed, you need something else. Go to http://www.wisesolutions.com You'll find a Windows installer program, with a demo-version (30days license). Try this, it would be my best recommendation. > > I know there's various ways of building Windows distros like that, but > am not sure what's currently preferred. Gordon McMillan's site > www.mcmillan-inc.com has had its domain expire (he really should renew > it before some squatter grabs it!) and the mirror that I've found > indicates that it was last updated for Python 2.3. I wrote my app > under 2.4 and while I don't think I depend heavily on any 2.4 > features, I'd rather not have to downgrade just to make this exe > installer. You'll have to test your application on Windows, in any case. I've built lots of applications which run in both worlds (Linux/Windows). Usually this works, but occasionally you'll have to deal with strange things. One is, if you use ODBC. There's good chance that you'll have to deal with access restrictions in the %SYSTEM% directory, unless you require an administrator's account for your application. If you test your app on a Windows machine, you can easily install Python 2.3 and Python 2.4 on the same machine without conflicts. Just try out, if your app works with either. If it works with both, why not use 2.3? > There's also py2exe--is that as good? Depends on your application, if that is acceptable. I have no experiences with that. > > Also, what's the preferred way of releasing updates? That is, let's > say I want to update my .py files and release a new version fairly > frequently--should I just make a new .exe every time? Providing an installation program called Setup.exe or Install.exe which does everything (guided by a sequence of dialog boxes where the user presses only the return key to get through the successful installation), is state-of-the-art. Usually, one of the Wise or InstallShield installers, are used. Or simple WinZip-Packages. > Would launching the new one cleanly overwrite or uninstall the old one? If you've done it in the proper way with the proper tool, yes. > Total coolness would be a way to ship an "update.py" along with the app, > that syncs the app up to a Subversion repository, but that may be > asking a bit much. Who are your customer's (the recipients of your program releases)? Usually, you cannot rely that they have online access to your repository. Then, they are potentionally interested in security issues and/or stability of the program. I'd not like a program which is said to require frequent updates - I'd guess that there's not much quality inside... If your application has a GUI, a menu entry might fetch your update files and place them wherever they must reside. your update.py might feed that menu entry. Quite easy. If you have command line apps, why not provide an additional update.py and then, if you provide updates, just install them using your installed update.py. The only thing: How do you keep track of path/desktop/file information and how do you deal with user rights etc.? Are you aware of how this is done under WindowsXP? It's quite different from older Windows platforms! Therefore it might be easier, to leave this to professional installation tools. > > I do have Visual C++ installed on the development machine, if that helps. Isn't Visual C++ still coming with a restricted version of InstallShield? If so, check if you can use that. It might give your release a sort of professional shine... You'll certainly find out, that managing the registry/desktop file system will cost most energy, if you want to release your apps to WindowsXP. Once Python is running your apps, the rest is peanuts. Bernhard -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Bernhard Holzmayer <[EMAIL PROTECTED]> writes: > I can feel your unhappiness, and I share it. Hi Paul! > Here are some hints... Thanks! ;-) > Since your installer needs to run before Python is installed, you need > something else. Go to http://www.wisesolutions.com > You'll find a Windows installer program, with a demo-version (30days > license). Try this, it would be my best recommendation. Hmm, ok, it looks like the paid version is around 500 USD. Since this is a Windows thing I'm ok in principle with using a payware packaging app, but that's a bit on the expensive side. I'll see what the customer says but I think they might resist. > You'll have to test your application on Windows, in any case. > I've built lots of applications which run in both worlds (Linux/Windows). > Usually this works, but occasionally you'll have to deal with strange > things. One is, if you use ODBC. There's good chance that you'll have to > deal with access restrictions in the %SYSTEM% directory, unless you require > an administrator's account for your application. The app works ok under Windows now. I don't use ODBC. I might need some database connectivity later and will probably use MySQL. I don't want to need an admin account. Right now the app just has a Tkinter gui, reads and writes a few files and talks to some sockets. I might need to add some C extensions later but those should be pretty portable. > If you test your app on a Windows machine, you can easily install > Python 2.3 and Python 2.4 on the same machine without > conflicts. Just try out, if your app works with either. If it works > with both, why not use 2.3? I guess I could do that. I believe I make some minor use of 2.4 features but I can probably retrofit those things. > > There's also py2exe--is that as good? > Depends on your application, if that is acceptable. > I have no experiences with that. Me neither. I was hoping to find out its good and bad points as compared with alternatives. > Who are your customer's (the recipients of your program releases)? > Usually, you cannot rely that they have online access to your repository. > Then, they are potentionally interested in security issues and/or stability > of the program. I'd not like a program which is said to require frequent > updates - I'd guess that there's not much quality inside... The program is under active development and sprouting new features every few minutes. The idea is to release a new development build once a week or so, for internal use by the customer. > If your application has a GUI, a menu entry might fetch your update files > and place them wherever they must reside. your update.py might feed that > menu entry. Quite easy. Hmm, that's another thing I'd have to code--maybe it's feasible. I'll think about it. > If you have command line apps, why not provide an additional update.py > and then, if you provide updates, just install them using your installed > update.py. The only thing: How do you keep track of path/desktop/file > information and how do you deal with user rights etc.? > Are you aware of how this is done under WindowsXP? It's quite different from > older Windows platforms! Therefore it might be easier, to leave this to > professional installation tools. No I'm really ignorant about Windows. I just put the app's files in C:/Program Files/appname because that's what one of the other developers said to do. > > I do have Visual C++ installed on the development machine, if that helps. > > Isn't Visual C++ still coming with a restricted version of InstallShield? > If so, check if you can use that. It might give your release a sort of > professional shine... Hmm, that's really really interesting. How would I find out? > You'll certainly find out, that managing the registry/desktop file system > will cost most energy, if you want to release your apps to WindowsXP. > Once Python is running your apps, the rest is peanuts. Oh man, I was hoping to avoid that level of hassle. My app doesn't use any registry keys of its own, but I guess the Python executable does, and that stuff presumably has to be updated with every reinstall, and something is sure to eventually go wrong and corrupt the registry, if this is anything like the Windows that I'm used to hearing about. Sigh. Just how bad is that under Windows XP? I'm used to Windows 95 completely falling apart at the slightest error but I have the impression that XP is a bit more solid. Maybe I'll have to just tell them to install Python 2.4 from its distro MSI and then I can put together a distutils setup.py thingie which they'd run separately. That might be acceptable to the customer if it saves a lot of development effort and prevents user hassles when things go wrong. It would sure be nice to have one of those slick one-click installers though. -- http://mail.python.org/mailman/listinfo/python-list
printing arrays in shell, and .py association with idle
I have been using python for the last 3 years and feel it to be an excellent programming language. However, I have run into a few snags or annoyances. I am currently creating a computational physics simulation which requires large arrays and am using numeric, although this is not a list for numeric, I think that my question falls under python in general. 1. My first problem is with printing these large arrays for debugging purposes. Is there any way to prevent the python shell from word wrapping single array print statements? I'm simply using: print hamiltonian where hamiltonian is an array of complex numbers. Changing window size (default or otherwise) does not change this, and I have found the option no-where. 2. Is there a foolproof way to associate .py files to open with IDLE, and when ending my program, not causing IDLE to quit? I have tried various methods to do this but none have worked so far. Thank you and please accept my apology if this is the wrong location for these questions. -- http://mail.python.org/mailman/listinfo/python-list
RE: Problem listing services with wmi
[Jean-Sébastien Guay]
|
| I installed Tim Golden's wmi module
| (http://tgolden.sc.sabren.com/python/wmi.html), in the hopes it would
| help me list and work with services on my Win32 machine. Now,
| everything seems fine except for one thing : Listing services!
|
| import wmi
|
| c = wmi.WMI ()
| for s in c.Win32_Service ():
| if s.State == 'Stopped':
| print s.Caption, s.State
|
| and I get :
|
| Traceback (most recent call last):
| File "", line 1, in ?
| File "G:\Python-2.4\Lib\site-packages\wmi.py", line 404, in __call__
| return self.wmi.query (wql)
| File "G:\Python-2.4\Lib\site-packages\wmi.py", line 583, in query
| raise WMI_EXCEPTIONS.get (hresult, x_wmi (hresult))
| wmi.x_wmi: -2147217398
Nothing obvious, I'm afraid. I cut-and-pasted the code directly
from your email and it worked fine on my Win2K machine. For your
information, what the code is doing behind the scenes is the following:
import win32com.client
c = win32com.client.GetObject (
"winmgmts:{impersonationLevel=Impersonate,authenticationLevel=Default}/root/cimv2"
)
for service in c.ExecQuery ("SELECT * FROM Win32_Service"):
if service.Properties_ ("State").Value == "Stopped":
print service.Properties_ ("Caption").Value
print service.Properties_ ("State").Value
You might try cutting-and-pasting that code into an interpreter window
to see what happens. Likewise, the following code snippet does something
similar for vbs. Save it as something.vbs, and then run it from the
command prompt with "cscript something.vbs" (or however you want to
do it). I'd be interested to know if it gives the same error as the
Python version.
set wmi = GetObject ("winmgmts:{impersonationLevel=impersonate}")
set ServiceSet = wmi.InstancesOf ("Win32_Service")
for each Service in ServiceSet
WScript.Echo Service.Description
Next
TJG
PS I realise that by now you've probably moved on from
this approach, but if you did manage to pin down a problem
we could address, I'd be very glad to address it.
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trouble with copy/deepcopy
Привет Marc! 16 мая 2005 в 22:18, Marc 'BlackJack' Rintsch в своем письме к All писал: MR> That clears only one dictionary at class level. Which is visible on MR> both instances. MR> class Distribution: MR> def __init__(self): MR> self.__gr_on_transp = dict() MR> self.__ostatok_m = dict() MR> ... MR> This creates *instance variables* which should be deepcopied MR> without problems. Hmm. I don't find definition of "class variable" in manual. I try to test it on such a simple test and find that such variable is NOT shared between copies: class C: q=int() c1=C() c2=C() c1.q=5 c2.q=10 print c1.q #5 print c2.q #10 After deepcopy of c1 or c2, all classes have own copy of q. After replacing integer q on dictionary, results are the same. There is an error? Alexander, [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
RE: Problem listing services with wmi
[Jean-Sébastien Guay] [... snip Larry Bates' suggestion of removing whitespace ...] | Out of curiosity, is there any reason why whitespace between | the method | name and parameter list parentheses isn't good? Because the code I | posted before was copy-pasted from Tim Golden's site | (http://tgolden.sc.sabren.com/python/wmi.html) and the spaces | were there. It's just a matter of style. Whitespace isn't *that* significance in Python! I personally -- in whatever language -- put spaces between function names and their first parameter. Guido vR, as someone else has pointed out, prefers not to. TJG This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk -- http://mail.python.org/mailman/listinfo/python-list
Re: Importing and namespace visibility
jean-marc wrote:
> Merci Bruno, ( and also to Fredrik )
>
> So I think I understand correctly, if I say that:
> each modulkes requires its own set of reference to whatever objects it
> needs to speak. The interpreter wil see not to create extra copies of
> the compiled code if many modules import the same modules but will make
> them all point to the one already existing (in this program's
> execution).
Seems right.
> Practically, it means every module import whatever it needs - be
> careful with recursive imports - keep things tidy by using the 'import
> suchModule' (and use dotted name chains to reach whatever is needed).
There's a way to shortcut long.fully.dotted.Name without using the 'from
xxx import' syntax:
import long.fully.dotted
Name = long.fully.dotted.Name
> PS Nice weather in Bordeaux ?
Well... varying, as usual !-)
--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])"
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Re: Windows distribution suggestions?
Paul Rubin wrote: >Bernhard Holzmayer <[EMAIL PROTECTED]> writes: > > >>I can feel your unhappiness, and I share it. Hi Paul! >>Here are some hints... >> >> > >Thanks! ;-) > > > >>Since your installer needs to run before Python is installed, you need >>something else. Go to http://www.wisesolutions.com >>You'll find a Windows installer program, with a demo-version (30days >>license). Try this, it would be my best recommendation. >> >> > >Hmm, ok, it looks like the paid version is around 500 USD. Since this >is a Windows thing I'm ok in principle with using a payware packaging >app, but that's a bit on the expensive side. I'll see what the >customer says but I think they might resist. > > > >>You'll have to test your application on Windows, in any case. >>I've built lots of applications which run in both worlds (Linux/Windows). >>Usually this works, but occasionally you'll have to deal with strange >>things. One is, if you use ODBC. There's good chance that you'll have to >>deal with access restrictions in the %SYSTEM% directory, unless you require >>an administrator's account for your application. >> >> > >The app works ok under Windows now. I don't use ODBC. I might need >some database connectivity later and will probably use MySQL. I don't >want to need an admin account. Right now the app just has a Tkinter >gui, reads and writes a few files and talks to some sockets. I might >need to add some C extensions later but those should be pretty portable. > > > >>If you test your app on a Windows machine, you can easily install >>Python 2.3 and Python 2.4 on the same machine without >>conflicts. Just try out, if your app works with either. If it works >>with both, why not use 2.3? >> >> > >I guess I could do that. I believe I make some minor use of 2.4 features >but I can probably retrofit those things. > > > >>>There's also py2exe--is that as good? >>> >>> >>Depends on your application, if that is acceptable. >>I have no experiences with that. >> >> > >Me neither. I was hoping to find out its good and bad points as compared >with alternatives. > > > >>Who are your customer's (the recipients of your program releases)? >>Usually, you cannot rely that they have online access to your repository. >>Then, they are potentionally interested in security issues and/or stability >>of the program. I'd not like a program which is said to require frequent >>updates - I'd guess that there's not much quality inside... >> >> > >The program is under active development and sprouting new features >every few minutes. The idea is to release a new development build once >a week or so, for internal use by the customer. > > > >>If your application has a GUI, a menu entry might fetch your update files >>and place them wherever they must reside. your update.py might feed that >>menu entry. Quite easy. >> >> > >Hmm, that's another thing I'd have to code--maybe it's feasible. I'll >think about it. > > > >>If you have command line apps, why not provide an additional update.py >>and then, if you provide updates, just install them using your installed >>update.py. The only thing: How do you keep track of path/desktop/file >>information and how do you deal with user rights etc.? >>Are you aware of how this is done under WindowsXP? It's quite different from >>older Windows platforms! Therefore it might be easier, to leave this to >>professional installation tools. >> >> > >No I'm really ignorant about Windows. I just put the app's files in >C:/Program Files/appname because that's what one of the other developers >said to do. > > > >>>I do have Visual C++ installed on the development machine, if that helps. >>> >>> >>Isn't Visual C++ still coming with a restricted version of InstallShield? >>If so, check if you can use that. It might give your release a sort of >>professional shine... >> >> > >Hmm, that's really really interesting. How would I find out? > > > >>You'll certainly find out, that managing the registry/desktop file system >>will cost most energy, if you want to release your apps to WindowsXP. >>Once Python is running your apps, the rest is peanuts. >> >> > >Oh man, I was hoping to avoid that level of hassle. My app doesn't >use any registry keys of its own, but I guess the Python executable >does, and that stuff presumably has to be updated with every >reinstall, and something is sure to eventually go wrong and corrupt >the registry, if this is anything like the Windows that I'm used to >hearing about. Sigh. Just how bad is that under Windows XP? >I'm used to Windows 95 completely falling apart at the slightest >error but I have the impression that XP is a bit more solid. > >Maybe I'll have to just tell them to install Python 2.4 from its >distro MSI and then I can put together a distutils setup.py thingie >which they'd run separately. That might be acceptable to the customer >if it saves a lot of development effort and prevents user
Re: printing arrays in shell, and .py association with idle
Paris Miles-Brenden wrote: > I have been using python for the last 3 years and feel it to be an > excellent programming language. However, I have run into a few snags or > annoyances. I am currently creating a computational physics simulation > which requires large arrays and am using numeric, although this is not a > list for numeric, I think that my question falls under python in general. > > > 1. My first problem is with printing these large arrays for debugging > purposes. Is there any way to prevent the python shell from word > wrapping single array print statements? I'm simply using: > > print hamiltonian > > where hamiltonian is an array of complex numbers. Changing window size > (default or otherwise) does not change this, and I have found the option > no-where. Well this at least is a Numeric-specific question, not a general Python one. Anyways, the string representation can be controlled by supplying the appropriate callback. From Numeric.py (pardon any unfortunate linewraps): #Use Konrad's printing function (modified for both str and repr now) from ArrayPrinter import array2string def array_repr(a, max_line_width = None, precision = None, suppress_small = None): return array2string(a, max_line_width, precision, suppress_small, ', ', 1) def array_str(a, max_line_width = None, precision = None, suppress_small = None): return array2string(a, max_line_width, precision, suppress_small, ' ', 0) multiarray.set_string_function(array_str, 0) multiarray.set_string_function(array_repr, 1) -- Robert Kern [EMAIL PROTECTED] "In the fields of hell where the grass grows high Are the graves of dreams allowed to die." -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
Lex Python
I am using bumblebee software PARSER GENERATOR to make a C file from LEX regular definitions. I want to compile that C file with VS .NET but I have problems. I am working this for Python regular definitions. Does somebody know how to configure a project to work? Or maybe somone havde done all this and can hel me in that way.I need this help soon as possible. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Python forum
Hi, I'm going to say a suggestion, why don't you create a forum like the one of Ruby (http://www.rubyforums.com/)? for the novices this is a great help, better than a mail list It's also worth noting that rubyforums.com has nearly no posts (six total) because it takes very just a short time working. I know that you have python-list, it's both an email and a usenet list. But I think that a forum is great for the learning. The test is in gentoo's forums. They are a lot of experienced people answering questions without any problem and it goes very well Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Quick Reference from module doc strings.
> Do you have any feature suggestions, additional information that could > go in, something that would extend the content in some way and make it > more useful? I have written something similar which I use all the time. It generates ReST output which I can browse with "less" from the command line, as well as HTML output and PDF output that I can print. The hard work is done by docutils, of course. I have options to specify if I want to least private names or not, and to specify if I want an analytical index to be generated or not. Also, the HTML output contains hyperlinks to the original source code, so I can see it with a click. I can feed to "minidoc" whole packages (it works recursively on subpackages, so everything is documented). It was unvaluable in my struggle with Zope. Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: trouble with copy/deepcopy
Alexander Zatvornitskiy wrote:
> Hmm. I don't find definition of "class variable" in manual. I try to test
> it on such a simple test and find that such variable is NOT shared between
> copies:
>
> class C:
> q=int()
>
> c1=C()
> c2=C()
> c1.q=5
> c2.q=10
> print c1.q
> #5
> print c2.q
> #10
>
Your test is flawed:
>>> class C:
... q = 0 # class variable
...
>>> c = C()
>>> C.__dict__
{'q': 0, '__module__': '__main__', '__doc__': None}
>>> c.__dict__
{}
>>> c.q
0
>>> c.q = 42 # this is stored in the instance, not the class
>>> c.__dict__
{'q': 42}
>>> C.__dict__
{'q': 0, '__module__': '__main__', '__doc__': None}
>>> c.q
42
>>> del c.q
>>> c.q # because C.q is looked up as a fallback, 0 magically reappears
0
Peter
--
http://mail.python.org/mailman/listinfo/python-list
Re: Newbie : checking semantics
[EMAIL PROTECTED] (Bengt Richter) writes: [block end statements] > Training wheels do no belong as a permanent part of a bicycle, Yes, but they would be useful for example in web programming (embedding Python into HTML), too. So they are not only training wheels. But that's not so important. What Python got really wrong is mixing binding and assignment (because this way you have little chance to catch typos in identifiers). -- Stefan. -- http://mail.python.org/mailman/listinfo/python-list
Function parameter passing problem
Hi, I am new to python and tried to pass parameters between one function to another. I tried two approaches in doing this but failed. The first is, I tried to assign a variable in foo1() inside an HTML tag so that I can retreive it in foo2() using (get_form_var()). But failed using my limited python knowledge. The sample code. def foo1(request, result) ... ... Id_No, FirstName, LastName = result """ .. .. # I would like to assign Id_No variable to id. ... .. """ The second is, I tried using "return Id_No" statement foo2() function using a return statement below the tag. I tried this option but unfortunately when I hit the SUBMIT button it only displayed the variable and got stucked and didn't continue to the called foo2(). I also have a problem with my user defined function foo2() which I created at first with one parameter to accept the variable of foo1(). But when I added another parameter to accomodate some more and executed the code, an error message TypeError: foo2() takes exactly 2 arguments (1 given). I thought I can put as many parameters I could since this is user defined function, am I correct in this? I have no more options to this problem, hope you will help me . Thank you in advance. Cheers! Ed Discover Yahoo! Have fun online with music videos, cool games, IM and more. Check it out! http://discover.yahoo.com/online.html -- http://mail.python.org/mailman/listinfo/python-list
Re: Python forum
Jonas Melian wrote: > Hi, > > I'm going to say a suggestion, why don't you create a forum like the one > of Ruby (http://www.rubyforums.com/)? for the novices this is a great > help, better than a mail list > > It's also worth noting that rubyforums.com has nearly no posts (six > total) because it takes very just a short time working. > > I know that you have python-list, it's both an email and a usenet list. > But I think that a forum is great for the learning. The test is in > gentoo's forums. They are a lot of experienced people answering > questions without any problem and it goes very well Various Python web fora have sprung up now and again. None of them ever grab much of an audience. OTOH, if you're volunteering your own time and effort to set one up, I'm not going to stop you. -- Robert Kern [EMAIL PROTECTED] "In the fields of hell where the grass grows high Are the graves of dreams allowed to die." -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Paul Rubin wrote: >> Since your installer needs to run before Python is installed, you need >> something else. Go to http://www.wisesolutions.com >> You'll find a Windows installer program, with a demo-version (30days >> license). Try this, it would be my best recommendation. > > Hmm, ok, it looks like the paid version is around 500 USD. Since this > is a Windows thing I'm ok in principle with using a payware packaging > app, but that's a bit on the expensive side. I'll see what the > customer says but I think they might resist. 1) Maybe you can start with the 30days demo license to find out. 2) The high price is paid for the benefit, that you won't get lost inside the terrific installation jungle like registry, access restrictions, dlls etc. In the end, it's your benefit, not your customer's. If I were the customer, I'd demand a fluent installation process at no cost and without any risk and/or conflict with other installed software. If I were the developer (you), I'd compare all costs/times with that price. If you calculate one hour for let's say 25 USD, the question is: will it save you 20 hrs. I guess so. If you have spare time, it doesn't get paid. > The app works ok under Windows now. Congratulations. > I don't use ODBC. I might need some database connectivity later and will probably use MySQL. Then you'll probably use ODBC, since the MySQL server will probably not be run under Windows and on the same machine. > I don't want to need an admin account. Nobody wants that. It just happens... > Right now the app just has a Tkinter gui, That's safe in general, and probably a good choice. > reads and writes a few files and talks to some sockets. Not that trivial! Plan enough time for testing. And, if you install without sophisticated tool, reserve enough time for troubleshooting and modifications... > The program is under active development and sprouting new features > every few minutes. The idea is to release a new development build once > a week or so, for internal use by the customer. If the customer runs it on different machines, make sure that you always have one installation around where you work, which is exactly as the one at the customer's site. If the customer is able to run different versions at the same time, keep one living copy of every possible version. Hunting bugs while you have lost the overview of the versions, will haunt you in the end... > >> If your application has a GUI, a menu entry might fetch your update files >> and place them wherever they must reside. your update.py might feed that >> menu entry. Quite easy. > > Hmm, that's another thing I'd have to code--maybe it's feasible. I'll > think about it. Have a look at one of the Adobe Acrobat Reader's newest versions. They do this. Indeed, it doesn't work on my computer, but that's the idea... > No I'm really ignorant about Windows. I just put the app's files in > C:/Program Files/appname because that's what one of the other developers > said to do. Don't do that, despite what the others say. You may propose that, but in any case give the installer the choice to change it. Lots of people use different partitions which separate Windows / Programs / Data. In other countries even Windows uses different path names (e.g. here in Germany C:/Programme). According to Microsoft's Technical Reference, you'd better ask the registry to find out where applications usually reside. (That's what professional installation software does.) I guess that neither your apps nor Python requires special folders or paths, so don't impress this disadvantage artificially. Vice versa: don't ask for another drive/partition, because some users have only C:/... > >> > I do have Visual C++ installed on the development machine, if that >> > helps. >> >> Isn't Visual C++ still coming with a restricted version of InstallShield? >> If so, check if you can use that. It might give your release a sort of >> professional shine... > > Hmm, that's really really interesting. How would I find out? Check the installation. Your StartMenu should show the appropriate entry under VisualStudio/...tools... If not, maybe you forgot to install it. Or, it's gone away like some other precious tools... > >> You'll certainly find out, that managing the registry/desktop file system >> will cost most energy, if you want to release your apps to WindowsXP. >> Once Python is running your apps, the rest is peanuts. > > Oh man, I was hoping to avoid that level of hassle. In contrary, that's what really makes fun. The registry is like a bomb in your hand - it provides mighty power over the user!!! > My app doesn't use any registry keys of its own, but I guess the > Python executable does, and that stuff presumably has to be updated > with every reinstall, Probably no. Since your update will certainly only affect py-files, there's no reason to worry about the Python's registry activities. The other thing is, that your update must know where to put the update
Re: Windows distribution suggestions?
On Tuesday 17 May 2005 09:35, Timothy Smith wrote: > mate dont bugger around with all that. py2exe will make you a windows > native exe to run. and for updates you just need to update it's > library.zip. py2exe is working great for me too. >> My app contains three different programs (say alice.py, bob.py, and >> carol.py) that need to be independently launchable, and a dozen or >> so other .py files that get imported into those first three One tip: make sure your three top-level scripts are as empty as possible: just import some other module and call a function. All your active code is then in some library.zip shared between the three, and you need never change alice.exe, bob.exe, and carol.exe > use NSIS for the installer, it can do anything you want an > it's free. it couldn't be more simple, shoot me an email if you > need more Ive not used NSIS, but I have had good results from the free WiX tools, at http://sourceforge.net/projects/wix/. Documentation is poor, but examples are plenty. -- Toby Dickenson -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Toby Dickenson wrote: >On Tuesday 17 May 2005 09:35, Timothy Smith wrote: > > >>mate dont bugger around with all that. py2exe will make you a windows >>native exe to run. and for updates you just need to update it's >>library.zip. >> >> > >py2exe is working great for me too. > > > >>>My app contains three different programs (say alice.py, bob.py, and >>>carol.py) that need to be independently launchable, and a dozen or >>>so other .py files that get imported into those first three >>> >>> > >One tip: make sure your three top-level scripts are as empty as possible: just >import some other module and call a function. All your active code is then in >some library.zip shared between the three, and you need never change >alice.exe, bob.exe, and carol.exe > > > >>use NSIS for the installer, it can do anything you want an >>it's free. it couldn't be more simple, shoot me an email if you >>need more >> >> > >Ive not used NSIS, but I have had good results from the free WiX tools, at >http://sourceforge.net/projects/wix/. Documentation is poor, but examples are >plenty. > > > another good one is Inno, although it's not as easy to use as NSIS. Inno and NSIS can do anything a commercial installer can do, Inno especially. -- http://mail.python.org/mailman/listinfo/python-list
Help wanted
Hello NG, I'm a 59 year old Networker who was pushed to go to school for 2 years. I think I did it fine 'till now. But now I have to make a small project in Python with Y-Pages and Snakeletts. My Problem is that Python is like Arabian to me, and I have Time till Sunday. My Question: is here anyone who is willing to help me by PM on this projekt? The teacher told us it will be approx. 50 Lines of Code. I have to make a Webapplication wich will take Number and Title and number of minutes of CD's. It should be done with strings, no saving into an SQL-Database or so. I have to add , edit, search and show and delete Items. Thanks in advance Jacob -- http://mail.python.org/mailman/listinfo/python-list
Re: query progress bar
Timothy Smith wrote: > is it possible to mke a progress bar for queries? say i have a query > that will take 20 seconds, i'd like to give some feed back to users on > how long this will take. it is strictly impossible to predict that cause of network load, server load, query complexity i recommend you put an activity widget, something moving (ie throbber in wxPython) while waiting for the result (like the rotating circle in firefox). once query is finished stop your moving stuff, so the user knows it's completed. So you don't need a progress bar, but an activity widget. in gtk, i saw that progress bar could be put in activity mode. And don't forget to add a timeout ... François -- http://mail.python.org/mailman/listinfo/python-list
\r functionality
in c and c++ there is a useful way to refresh an output line in printf and cout using \r meta command. So for example in the wget application the progress of the download is updated on the same output line of the screen. From an intital investigation python seems to lack this. Is this correct? -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie : checking semantics
Op 2005-05-16, Bengt Richter schreef <[EMAIL PROTECTED]>: > On Mon, 16 May 2005 18:40:43 +0200, Stefan Nobis <[EMAIL PROTECTED]> wrote: > >>rbt <[EMAIL PROTECTED]> writes: >> >>> True beginners (no programming experience whatsoever) don't have >>> to deal with unlearning stuff such as the bracket plague. >> >>That's true. But they also not very used to give nothing (-> >>whitespace) a meaning. I teached quite some beginners and most of >>them had problems to get the indentation right. >> >>At least in the very beginning IMHO it would be useful to >>explicitly end a block with some kind of an end statement. >> >>Meaningful whitespache is not a big problem (as many people seems >>to think) but it's also not very obvious and sometimes it causes >>at least a little bit trouble. >> > Training wheels do no belong as a permanent part of a bicycle, IMO. But what is a training wheel depends on your point of view. IMO the required indentation is more like permanent training wheels than end block-markers would be. A structure in general has a begin marker and an end marker. Even python has them in some cases like lists and tuples. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: \r functionality
Hi! > in c and c++ there is a useful way to refresh an output line in printf > and cout using \r meta command. So for example in the wget application > the progress of the download is updated on the same output line of the > screen. From an intital investigation python seems to lack this. Is > this correct? No. Well, I think you can't do it with print, but you can do this: import sys import time signs = "|/-\\" while 1: for i in signs: sys.stdout.write(i+"\r") sys.stdout.flush() time.sleep(0.2) Regards, Markus -- http://mail.python.org/mailman/listinfo/python-list
Re: Python forum
Hi! > I'm going to say a suggestion, why don't you create a forum like the one > of Ruby (http://www.rubyforums.com/)? for the novices this is a great > help, better than a mail list > > It's also worth noting that rubyforums.com has nearly no posts (six > total) because it takes very just a short time working. > > I know that you have python-list, it's both an email and a usenet list. > But I think that a forum is great for the learning. The test is in > gentoo's forums. They are a lot of experienced people answering > questions without any problem and it goes very well If you speak German, there is a forum at www.python-forum.de . There is also an english one at http://python-forum.org/py/index.php, but as you can see, there's not much traffic :-/ Regards, Markus -- http://mail.python.org/mailman/listinfo/python-list
Re: \r functionality
Jake wrote: > in c and c++ there is a useful way to refresh an output line in printf > and cout using \r meta command. So for example in the wget application > the progress of the download is updated on the same output line of the > screen. From an intital investigation python seems to lack this. Is > this correct? > >>> print "a\rb" b >>> -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Bernhard Holzmayer <[EMAIL PROTECTED]> writes: > > Hmm, ok, it looks like the paid version is around 500 USD > > I'll see what the > > customer says but I think they might resist. > > 1) Maybe you can start with the 30days demo license to find out. Yes, I'd certainly do that first. > 2) The high price is paid for the benefit, that you won't get lost inside > the terrific installation jungle like registry, access restrictions, dlls > etc. In the end, it's your benefit, not your customer's. Well, both would benefit, I think. > If I were the customer, I'd demand a fluent installation process at no cost > and without any risk and/or conflict with other installed software. Of course the customer wants this, but in reality it's going to have to cost them, so I have to explain that and let them decide. > If I were the developer (you), I'd compare all costs/times with that price. > If you calculate one hour for let's say 25 USD, the question is: will it > save you 20 hrs. I guess so. If you have spare time, it doesn't get paid. I wonder if I'd be trading off 20 hours messing with py2exe or whatever, against 20 hours of learning curve with Wise. Is Wise really easy and fast to get started with? Well, I guess that's what the evaluation version is to help find out ;-). I'm concerned that it's going to be the same 20 hours either way (as compared with just having them install python.msi separately), and 20 hours of development probably means a full week on the calendar because of meetings, phone calls and all that usual stuff. This app is a small component of a big project and spending an extra week on it means the whole project takes longer, which is never a good thing. > > The app works ok under Windows now. > Congratulations. Ehh, no big deal, there's not much system dependency so far, and it was developed under Windows (with IDLE even) from the beginning. It may get more system dependent later. > Then you'll probably use ODBC, since the MySQL server will probably not be > run under Windows and on the same machine. Hmm, at least at first I'd run MySQL on the same machine under Windows (I know MySQL can run under Windows) but maybe that still needs ODBC. Eventually it may have to talk to another DB like Oracle. > > I don't want to need an admin account. > Nobody wants that. It just happens... Sigh. I guess it figures. > > reads and writes a few files and talks to some sockets. > Not that trivial! Plan enough time for testing. > And, if you install without sophisticated tool, reserve enough time for > troubleshooting and modifications... Yeah, I really want to keep the installation stuff simple. > If the customer runs it on different machines, make sure that you always > have one installation around where you work, which is exactly as the one at > the customer's site. Hmm, maybe not so easy, the customer may be using several different Windows configurations in different places. > If the customer is able to run different versions at > the same time, keep one living copy of every possible version. For now, I think I can say they have to track the current version. It may be an issue in the future. > [self-updating feature built into the app] > Have a look at one of the Adobe Acrobat Reader's newest versions. They do > this. Indeed, it doesn't work on my computer, but that's the idea... Well, it's something to keep in mind, but I'm hoping this stays simple. > > I just put the app's files in C:/Program Files/appname... > > Don't do that,... In other countries even Windows uses different > path names (e.g. here in Germany C:/Programme). Good point!!! Yes, the customer will be running some non-English Windows installations. Thanks for mentioning this, I'm sure I would have otherwise found out the hard way. > According to Microsoft's Technical Reference, you'd better ask the > registry to find out where applications usually reside. (That's what > professional installation software does.) Hmm, I think there's a Python function to read registry entries. I better check the docs. Can I just use C:/Appname like the Python installer does? If I have a way to launch the gui at all, I guess I can have a configuration screen that lets the user change that location. > >> Isn't Visual C++ still coming with a restricted version of InstallShield? > >> ... > Check the installation. Your StartMenu should show the appropriate entry > under VisualStudio/...tools... If not, maybe you forgot to install it. > Or, it's gone away like some other precious tools... I didn't see anything like that in the tools menu, but it's possible I didn't install it. I think it's a 2-CD installation and I only installed one of them (the guy at the office said that's the usual way). It's Visual Studio 6 (the customer is on MSDN and supplied me with the machine). > In contrary, that's what really makes fun. The registry is like a bomb in > your hand - it provides mighty power over the user!!! Arrgghhh
Re: Windows distribution suggestions?
Toby Dickenson <[EMAIL PROTECTED]> writes: > py2exe is working great for me too. I should give it a try. > One tip: make sure your three top-level scripts are as empty as > possible: just import some other module and call a function. All > your active code is then in some library.zip shared between the > three, and you need never change alice.exe, bob.exe, and carol.exe I think I understand what you're saying and it sounds like a very good idea. Thanks. > > use NSIS for the installer, it can do anything you want an > > it's free. it couldn't be more simple, shoot me an email if you > > need more > > Ive not used NSIS, but I have had good results from the free WiX > tools, at http://sourceforge.net/projects/wix/. Documentation is > poor, but examples are plenty. I'll look at these and at INNO (mentioned in another post). Thanks again to everyone. -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Paul Rubin wrote: >>your active code is then in some library.zip shared between the >>three, and you need never change alice.exe, bob.exe, and carol.exe > > I think I understand what you're saying and it sounds like a very > good idea. Thanks. One thing about updating files - sorry if I'm stating general and universal knowledge, but beware that on Windows you can't delete and/or replace a file if it's opened by any process. -- http://mail.python.org/mailman/listinfo/python-list
Re: Like Christ PBBUH Prayed
oh, just shut the fuck up -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Ivan Voras wrote: >Paul Rubin wrote: > > > >>>your active code is then in some library.zip shared between the >>>three, and you need never change alice.exe, bob.exe, and carol.exe >>> >>> >>I think I understand what you're saying and it sounds like a very >>good idea. Thanks. >> >> > >One thing about updating files - sorry if I'm stating general and >universal knowledge, but beware that on Windows you can't delete and/or >replace a file if it's opened by any process. > > hence i found you must do this immediately after updating sys.path_importer_cache.clear() zipimport._zip_directory_cache.clear() then unload your app -- http://mail.python.org/mailman/listinfo/python-list
Re: query progress bar
Timothy Smith wrote: > i'm using pypgsql Assuming you work with PostgreSQL, then: You know the EXPLAIN command? EXPLAIN will give you a very accurate estimation for the expense for the query. (You'll have to find out what cost means in terms of your progress.) I did never try this using pypgsql, but if it works, this might be your solution... The precision of EXPLAIN, however, depends on the modifications since the last time you ran VACUUM on the DB. If the size of tables or indices didn't suffer considerable changes since then, the estimation should be quite accurate. Bernhard -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Documentation (should be better?)
Overall organization is definitely an issue, at least for newer users.
As an occasional python user I remain constantly in a mode of having to
look up basic terminology for examples and exact spelling of terms in
order to knock out a quick script. I feel very much like Mr. Bottaro
that the docs, while quite good in some ways, can be frustrating and
inconsistent at times. Here's a link to a concrete and mostly real
stream of consciousness example of using the docs: (rather long)
http://home.pacbell.net/dl_brown/input_something.txt
Many responses from experienced users that show how to find a certain
piece of information really miss the point by a wide margin. It's nice
that they can find the information easily of course. It's those who
don't have the experience who can have more trouble. If the docs,
especially the tutorial, are intended to help those with limited
experience they should try to be a little more fool-proof with regard
to indexing and searching, and also have more basic examples.
Here are a couple specific suggestions for improvements:
-- Please add the basic input methods to the Input/Output section of
the tutorial (see previous link and the original post for this thread)
-- Add a Doc_Feedback button on many of the documentation pages so when
people have problems finding or understanding something they can
immediately and easily send feedback about that specific problem.
-- Consider at least renaming and reordering the main doc page links to
highlight the most important 2 or 3 docs for people who don't know
where to start. Right now the doc structure is too flat and
disconnected in my opinion. It needs to act more like a funnel. Today
I have to pick which document might contain the information I need and
if I'm wrong I probably won't find what I'm looking for quickly. The
present structure seems to work ok for experts, not so well for
novices.
-- If doc maintainers believe the better approach for most people is to
just search (I don't) then move the doc links to the side, put them in
a smaller font, and put a big search box in the middle of the docs
page. Right now search is in the far corner so the implicit
understanding is that it's not the first thing to try.
-- Find clearer names/descriptions for some documents. For example
maybe it's just me but what is the "_Library_ Reference"? I know about
python modules and python language, etc. What are python libraries.
Or is it just intended to mean generically a book in a library of
python books? There was some discussion and debate about which doc was
the "Manual" Perhaps one of the docs or a reorganized combination
should be called the Python Online Manual if "Manual" Implies that it's
the go-to book.
-- And finally, I recall the last time I tried to figure out how to do
something with a date value I looked in the datetime module. There are
lots of sophisticated tools apparently but I really never grasped how
to go about using them. A couple basic examples of what can be done
with the tools would be nice.
-- TkInter... (ok I'm done now)
>>> help(tKinter)
Traceback (most recent call last):
File "", line 1, in ?
NameError: name 'tKinter' is not defined
>>> help('tkinter')
no Python documentation found for 'tkinter'
>>> help('tKinter')
no Python documentation found for 'tKinter'
>>> help('TkIinter')
no Python documentation found for 'TkIinter'
>>> help('TkInter')
no Python documentation found for 'TkInter'
>>> help('Tkinter')
Help on module Tkinter: (don't believe it)
-- David
--
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Re: Python on a public library computer
John J. Lee wrote: > Why not Jython? There's no command prompt! The file menu from IE is also gone. There is a sun Java console but it looks like this: Java(TM) Plug-in: Version 1.4.2_06 Using JRE version 1.4.2_06 Java HotSpot(TM) Client VM User home directory = C:\Documents and Settings\x c: clear console window f: finalize objects on finalization queue g: garbage collect h: display this help message l: dump classloader list m: print memory usage o: trigger logging p: reload proxy configuration q: hide console r: reload policy configuration s: dump system properties t: dump thread list v: dump thread stack x: clear classloader cache 0-5: set trace level to Thanks for replying anyway! Anton -- http://mail.python.org/mailman/listinfo/python-list
Re: Python on a public library computer
John J. Lee wrote: > Why not Jython? There's no command prompt! The file menu from IE is also gone. There is a sun Java console but it looks like this: Java(TM) Plug-in: Version 1.4.2_06 Using JRE version 1.4.2_06 Java HotSpot(TM) Client VM User home directory = C:\Documents and Settings\x c: clear console window f: finalize objects on finalization queue g: garbage collect h: display this help message l: dump classloader list m: print memory usage o: trigger logging p: reload proxy configuration q: hide console r: reload policy configuration s: dump system properties t: dump thread list v: dump thread stack x: clear classloader cache 0-5: set trace level to Thanks for replying anyway! Anton -- http://mail.python.org/mailman/listinfo/python-list
Image.putpalette(Colors)?
Has somebody a example-script how i can put a other palette to a image? (after this the image should have similar outlook) -- http://mail.python.org/mailman/listinfo/python-list
Re: query progress bar
Bernhard Holzmayer wrote: >Timothy Smith wrote: > > > >>i'm using pypgsql >> >> > >Assuming you work with PostgreSQL, then: >You know the EXPLAIN command? > >EXPLAIN will give you a very accurate estimation for the expense for the >query. >(You'll have to find out what cost means in terms of your progress.) > >I did never try this using pypgsql, but if it works, this might be your >solution... > >The precision of EXPLAIN, however, depends on the modifications since the >last time you ran VACUUM on the DB. >If the size of tables or indices didn't suffer considerable changes since >then, the estimation should be quite accurate. > >Bernhard > > > i've never heard of pypgsql supporting andthing like that, but i'll have a look -- http://mail.python.org/mailman/listinfo/python-list
Re: Python on a public library computer
Timothy Smith wrote: > how locked down is the computer? there's a few (brave) public access > unix shell providers out there. if you could run telnet you could use them Sorry, no telnet. Every executable that is not listed is blocked. For example I can download: http://prdownloads.sourceforge.net/scintilla/Sc1.exe but if I run it I get two error messages: a) a 15 seconds "appguard" message b} 'access to the specified device, path or file is denied' Maybe some shell provider is a good idea, however I still think I should make a cherrypy form of 24 lines or so and run it over there and simulate a python interpreter on a webpage which I can access from here. Has this been tried before? How can I use cookies to identify interpreter sessions? Anton 'webpython_3000_server_at_xxx.xxx.xxx.xxx_>>>' -- http://mail.python.org/mailman/listinfo/python-list
Re: \r functionality
Jake wrote: > in c and c++ there is a useful way to refresh an output line in printf > and cout using \r meta command. So for example in the wget application > the progress of the download is updated on the same output line of the > screen. From an intital investigation python seems to lack this. Is > this correct? > >>> for i in range(1): ... print '\r',i,'and counting', ... and counting (not obvious from the copy/paste of the output is that it also displayed the intervening numbers as it counted). The important thing is to end each print statement with a comma (or use sys.stdout.write). -- http://mail.python.org/mailman/listinfo/python-list
Re: Interaction between TclTk editor with Python code
One way to get a handle on some Tcl variables from Python is to create Tkinter.Variable instances with the names of the existing Tcl variables (normally, the variable names are chosen arbitrarily). Once you've done this, you can do things like add variable traces (the trace_variable method) on the Python side. One thing to be aware of is that the Python object's __del__ will unset the variable on the Tcl side. Also, this code sets an initial value for the variable which may or may not be appropriate in your application. The code below was ripped from a larger application, so it may or may not work without modification. Jeff # This code is in the public domain from Tkinter import * def makevar(master, name, klass, *default): self = newinstance(klass) self._master = master self._tk = master.tk self._name = name if default: self.set(default[0]) else: self.set(self._default) return self def makebool(master, name, *default): return makevar(master, name, Tkinter.BooleanVar, *default) def makeint(master, name, *default): return makevar(master, name, Tkinter.IntVar, *default) def makefloat(master, name, *default): return makevar(master, name, Tkinter.DoubleVar, *default) def makestring(master, name, *default): return makevar(master, name, Tkinter.StringVar, *default) pgp8S84d8ZZDq.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Bug in Elementtree/Expat
Hello, I use Elementtree to parse an elementary SVG file (in fact, it is one of the examples in the "SVG essentials" book). More precisely, it is the fig0201.svg file in the second chapter. The contents of the file are as follows (i hope it will be rendered correctly): http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd";> Default User Coordinates Shows a rectangle on a grid in default user coordinates The parsing fails in the following way: Traceback (most recent call last): File "C:\privatedata\myapp.py", line 60, in ? root = ElementTree(file=infile).getroot() File "c:\python23\lib\site-packages\elementtree\ElementTree.py", line 554, in __init__ self.parse(file) File "c:\python23\lib\site-packages\elementtree\ElementTree.py", line 594, in parse parser.feed(data) File "c:\python23\lib\site-packages\elementtree\ElementTree.py", line 1171, in feed self._parser.Parse(data, 0) xml.parsers.expat.ExpatError: unbound prefix: line 6, column 1 The problem seems to lie with the xlink:href tag. If i remove the xlink namespace, it then does not produce a traceback. Thank you for helping Alain -- http://mail.python.org/mailman/listinfo/python-list
Re: question about the id()
"Giovanni Bajo" <[EMAIL PROTECTED]> writes: > Peter Dembinski wrote: > >>> BTW, a typical performance optimization (not done automatically by >>> python) is to hoist unchanging-value expressions out of loops, and >>> obj.method is often such an expression, so you will this strategy >>> when people try >>> to squeeze extra performance from their programs. >> >> Good to know. Is there any advanced optimizer for Python code, >> which would do such things for me (or suggest them, like pychecker >> does for readability)? > > > Prove that a.f() would not change the meaning of "a.f" after its > invokation is close to impossible. Many things in Python programs cannot be proved. But what about suggesting optimisations, not doing them automatically? The similar case may be found in refactorization -- most things cannot be proved, so the final decision is left to the programmer (and his unit tests). -- http://www.peter.dembinski.prv.pl -- http://mail.python.org/mailman/listinfo/python-list
Re: Python on a public library computer
Anton Vredegoor wrote: > Timothy Smith wrote: > > >>how locked down is the computer? there's a few (brave) public access >>unix shell providers out there. if you could run telnet you could use > > them > > Sorry, no telnet. Every executable that is not listed is blocked. For > example I can download: > > http://prdownloads.sourceforge.net/scintilla/Sc1.exe > > but if I run it I get two error messages: > > a) a 15 seconds "appguard" message > > b} 'access to the specified device, path or file is denied' There is a Java SSH client that runs in the browser. http://www.oit.duke.edu/sa/security/ssh.html -- Robert Kern [EMAIL PROTECTED] "In the fields of hell where the grass grows high Are the graves of dreams allowed to die." -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
best way to do this ...
Hi ALL,
I am having a issue with a particular storage of data problem and
wanted to know if I am going about it the wrong way.
I have a list of reference numbers associated with a product and I have
a socket that listens on a port. Now what happens is the client app
connects to the server - sends the product and the associated ref
numbers (there are a few per product). I need to be able to store these
in a data structure so that when the same product is called again -
it can display the ref numbers for that product.
I am new to OO programming - so please have mercy ;)
eg:
class ProductData:
def __init__(self,prod):
self.prod = prod
self.ref = []
def add_ref(self,refno):
self.ref.append(refno)
def __str__(self):
return "%s : %s" % (self.prod,",".join(self.ref))
products = ['table', 'chair', 'couch']
ref_numbers = ['1234','4567', '7890']
detail = {}
id = 0
for p in products:
detail[id] = ProductData(p)
for r in ref_numbers:
detail[id].add_ref(r)
id = id + 1
for a in detail:
print detail[a]
so I will get:
table : 1234,4567,7890
chair : 1234,4567,7890
couch : 1234,4567,7890
BUT I will need to be able to have this in a while loop - as there is a
socket listener there.
I keep getting this error:
for a in Detail:
RuntimeError: dictionary changed size during iteration
any ideas ?
Thanks
Tonino
what I want to be able to get is a dict of the products and associated
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Re: Python on a public library computer
Robert Kern wrote: > There is a Java SSH client that runs in the browser. > > http://www.oit.duke.edu/sa/security/ssh.html Great! I have a terminal. I can't figure out how to start jython from there though. Anton -- http://mail.python.org/mailman/listinfo/python-list
Re: Markov chain with extras?
Hi, I think is more easy explained as two linked markov chains. So given one list the other can be generated. Thanks, Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse global
Dennis> So far as I understand, the Dennis> global Dennis> is not needed for your example. I think the original context was that optparse was being used in the context of a function. Skip -- http://mail.python.org/mailman/listinfo/python-list
Re: Python forum
Jonas Melian wrote: > Hi, > > I'm going to say a suggestion, why don't you create a forum like the one > of Ruby (http://www.rubyforums.com/)? for the novices this is a great > help, better than a mail list > > It's also worth noting that rubyforums.com has nearly no posts (six > total) because it takes very just a short time working. > > I know that you have python-list, it's both an email and a usenet list. > But I think that a forum is great for the learning. The test is in > gentoo's forums. They are a lot of experienced people answering > questions without any problem and it goes very well > > Thanks Don't forget that there's also the Tutor list (see http://www.python.org/mailman/listinfo/tutor ), targeted to people looking to learn the language... -- // Today's Oblique Strategy (© Brian Eno/Peter Schmidt): // Change instrument roles // Brett g Porter * [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: Python on a public library computer
Chris Lambacher topposted: > usb key and moveable python. > http://www.voidspace.org.uk/python/movpy/ I have a usb card reader and I can use it. That saves me from having to have remote storage at least. However I can only save files, not open them, except if I use word, excel or powerpoint. The moveable python is great indeed. This worked here before, but then I could even access *other* peoples usb sticks in this whole building ... Crazy. Not anymore though. They could really use someone like me here for a sensible security policy that doesn't cripple the users. I can't even set internet options, that means I can't remove my history or clear my cache :-( Anton 'security doesn't mean shooting everyone in the foot' -- http://mail.python.org/mailman/listinfo/python-list
Re: logging problems
I tried moving the import traceback to the start of the file (logging/__init__.py) but that did not seem to have any effect? I suppose the fix was in version 1.26 in cvs? -- http://mail.python.org/mailman/listinfo/python-list
Re: Python forum
Brett> Don't forget that there's also the Tutor list (see Brett> http://www.python.org/mailman/listinfo/tutor ), targeted to Brett> people looking to learn the language... I wonder if there's a way to gateway the tutor list to the python-forum.org forum, probably to the beginner's forum. Skip -- http://mail.python.org/mailman/listinfo/python-list
Design Question. Data Acquisition/Display related.
Hi, I'm building a little application, which the goal is to: 1./ Collect data via Serial line and or via a file (for playback). 2./ Display these data as graph, oscilloscope, ... How manage this ? 1./ Is each "display" must responsible to acquire/read the data ? 2./ Or an engine collect the data then send them to each "display" ? Also, how to "anim" this ? 1./ Via a timer ? 2./ Via a simple loop (read/update display/pause/read user key) The app. will be a GUI (tkInter) app. and the user must be able to stop the process at any time. Sure, all this must be maintenable, let's say to acquire data via other type of channel or to other type of display... Yes, it's like a "mini" labView... Any idea or link is welcome. Thanks. STepH. -- http://mail.python.org/mailman/listinfo/python-list
a little trouble passing values to Oracle using bind variables
All, As the subject line says, I am having some trouble passing bind variables to Oracle. When I pass a printable string value, such as 'NM', I get data. When I try to pass a non-printable character, such as 'return' - chr(13), I get no data back. I can't simply make NactionCode = chr(13), as python would change the value of NactionCode to '\r' and Oracle sees this as a two byte character, and not chr(13). I have looked into how Oracle might accept something like '\x00' for chr(0), but to no avail. Any thoughts? thanks, Michael def goGetIt( NactivityDt, NactionCode ): dataQuery = '''select a, b, c from %s where activityDt = :NactivityDt and actionCode = :NactionCode order by %s ''' % ( schema.tableName ) dbm.cursor.execute(dataQuery, NactivityDt = activityDt, NactionCode = actionCode ) result = dbm.cursor.fetchall() return result NactivityDt = '12-apr-2005' NactionCode = 'NM' act1 = goGetIt( NactivityDt, NactionCode ) NactivityDt = '12-apr-2005' NactionCode = 'chr(13)' act2 = goGetIt( NactivityDt, NactionCode ) NactivityDt = '12-apr-2005' NactionCode = chr(13) act3 = goGetIt( NactivityDt, NactionCode ) ___ The information contained in this message and any attachment may be proprietary, confidential, and privileged or subject to the work product doctrine and thus protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me immediately by replying to this message and deleting it and all copies and backups thereof. Thank you. -- http://mail.python.org/mailman/listinfo/python-list
PyXML/expat and the empty elements
Hi all, is it possible to get the name of an empty element specified by ... the expat parser seems only to recognize the form Regards Armin -- http://mail.python.org/mailman/listinfo/python-list
Re: PyXML/expat and the empty elements
Armin Steinhoff wrote: > > > Hi all, > > is it possible to get the name of an empty element specified > by ... the expat parser seems only to recognize > the form > > Regards > > Armin Ok ... found the root of the problem. The expat parser is OK :) Regards Armin -- http://mail.python.org/mailman/listinfo/python-list
Re: Python on a public library computer
On 14 May 2005 04:21:04 -0700, rumours say that
"[EMAIL PROTECTED]" <[EMAIL PROTECTED]> might have
written:
>I'm typing this in a public library on a computer with OS windows 2000
>server. I can run Internet explorer, word, excel and powerpoint, that's
>it. Maybe java, but it seems to be flaky.
>
>I want to run python scripts from this computer.
I am not sure I will help you (uncertainty based on the part I snipped),
but the part so far can be easilly solved if you install Python for
single user inside the "Documents and settings\" folder (or
whatever it is called). I did in a similar case.
End of reply here; and now for some completely minor python success
story.
Some months ago, I happened to be for full workdays at a client's site,
with strict security rules enforced (no domain login == no access even
to web proxy) but I needed to access my company's internal mail server
from my laptop (which I do by ssh forwarding usually). I could plug in
my laptop to their network, get an address, but that was all (local
network access only).
So I asked permission from an employee there (working on a computer
logged on to the domain) if I could run a putty session with forwarding
enabled. He said he'd ask their BOFH; now, the BOFH was strictly a
windows person (I somehow connect "strictly-
persons" with lack of resourcefulness, as if these people have 7 bits
per byte :), and he thought that my case was hopeless, since the
employee's account had only access to a web proxy, and CONNECT requests
were only allowed to port 443, but he said ok anyway (in his place, I
wouldn't; but then again, what do I know? ;).
After a call to a colleague in order to redirect connections to port 443
(from the client's network) of an underused computer at my site to port
22, I set up putty to connect through their web proxy, but that didn't
work (since no authentication was given as requested).
Then it was that I downloaded python, installed it in the employee's
documents folder, and created a 'sniffer' between the web browser and
web proxy to find out the authentication headers. After testing them by
hand, I wrote a script to pretend it's the web browser requesting a
CONNECT from the web proxy, and putty would connect to my script which
would just pass data back and forth. It didn't work.
I quickly found out that their web proxy did NOT let anything come and
go, unless its client had sent at least 4 octets (and that was also a
security measure they had taken which I was not told about-- they wanted
only protocols where the client talks first, ie (pun intended) typically
HTTP). So putty was waiting for the ssh server to announce its version
before announcing itself, but the announcement of the server would not
come through until putty sent something.
So I changed the middle-server [midsrv]: as soon as putty connected to
the listening port of midsrv, it opened the connection to the web proxy,
and instantly sent the putty announcement to the ssh server, consuming
it when putty sent it normally, and happily moving octets around for the
rest of the connection. From my laptop, I could get my emails with
plain POP3.
That was in 34 minutes time (debugging time included).
When the network guy dropped by a couple of hours later to ask me if I
needed any help, I just thanked him for letting me connect. He
scratched his head, tried to understand what happened (didn't realise
that the python app was important even though he absent-mindedly passed
over it checking running tasks), so I let him think over it for several
minutes before explaining to him what I did. He was most impressed with
the python program when I showed it to him, gave a warning to the
employee: "ok, run his program, but don't let him touch your computer
again!", and then came to the following conclusion (much similar to a
Python motto):
"If Python can do this, it {Python} should be forbidden..."
PS Unfortunately, I could not charge "security consulting" fees.
--
TZOTZIOY, I speak England very best.
"Be strict when sending and tolerant when receiving." (from RFC1958)
I really should keep that in mind when talking with people, actually...
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Re: Design Question. Data Acquisition/Display related.
StepH wrote: >1./ Is each "display" must responsible to acquire/read the data ? >2./ Or an engine collect the data then send them to each "display" ? > > > I'd keep it simple: - DataCollector class asociated with one or more display instances (implemented as a list of display subscribers) it collects data from a source and notifies each subscribed display that new data is available. could something like a 'collect' method which performs: for display in self.subscribed_displays: display.update( data ) - Display class just a simple display class with an "update" method it should be able to receive new data and display new data (those 2 actions could be implemented in different methods, you might not want to display everytime new data is available... maybe you might want to consolidate data in some way and output it at some high interval) >Also, how to "anim" this ? > >1./ Via a timer ? >2./ Via a simple loop (read/update display/pause/read user key) > > a simple loop could do it - handle user events - collect data - update displays - sleep -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to do this ...
Am Tue, 17 May 2005 05:26:15 -0700 schrieb Tonino: > Hi ALL, > > I am having a issue with a particular storage of data problem and > wanted to know if I am going about it the wrong way. > > I have a list of reference numbers associated with a product and I have > a socket that listens on a port. Now what happens is the client app > connects to the server - sends the product and the associated ref > numbers (there are a few per product). I need to be able to store these > in a data structure so that when the same product is called again - > it can display the ref numbers for that product. The smallest database is the filesystem. Create a directory for every product. Store the references in a file in this directory. > > for a in Detail: > RuntimeError: dictionary changed size during iteration I did not see any dict in your code, but this message means, that you can't change the dictionary in the loop. Maybe this helps: for a, b in list(mydict.items()): Thomas -- Thomas Güttler, http://www.thomas-guettler.de/ -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to do this ...
hmm - but I want to store the data in memory eather than a filesystem
... it is not an issue if the program terminates - it is almost needed
while running and does not need to remember where it is ..
the dirctionary is detail = {}
will try the list() function - thanks
Tonino
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Re: Windows distribution suggestions?
>> One tip: make sure your three top-level scripts are as empty as
>> possible: just import some other module and call a function. All
>> your active code is then in some library.zip shared between the
>> three, and you need never change alice.exe, bob.exe, and carol.exe
>
> I think I understand what you're saying and it sounds like a very
> good idea. Thanks.
To elaborate, this approach has worked well for me when I've needed to
release multiple .exe's together:
First make a "dispatching" module like this (call it run.py)
if __name__ == '__main__':
app = sys.argv[0].lower()
if app.find('alice') != -1:
import alice
alice.main()
elif app.find('bob') != -1:
import bob
bob.main()
etc...
Next, use py2exe to create an executable for run.py, and then copy
run.exe to alice.exe, bob.exe, and carol.exe (the resulting .exe's will
be very small). The reasoning behind this is that this way only one
copy of all the DLLs, Python std library, and so forth need to be
included in your release.
And to second everyone else's suggestions: NSIS and InnoSetup are
great, free, and powerful. They have all the features you need to
automatically copy your files to the "proper" location on disk, create
desktop icons, and create an uninstaller entry - you'll just write a
small installation script telling what features you'd like to take
advantage of, but they figure out all the details and combine your
application files into a standalone installer (your app.exe).
It'll take a little work to get this all straightened out the first
time, but after that you can have a single build/release script so it's
painless from then on.
And for updates: the least problematic approach is to just release the
whole thing each time. IIRC, InnoSetup (and probably NSIS) include a
feature where you can detect if your app is running when the user tries
to install an update and you can prompt the user to shut down first.
You'd need to use ctypes or pywin32 to make your app detectable that
way, but it's only 1 or 2 lines of code. But, lemme know if you want to
go the route of updating only portions of the app - I've gone that
route too but it takes more work and has its own set of problems; I
might be able to save you a few headaches.
-Dave
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Re: Design Question. Data Acquisition/Display related.
Alex Verstraeten a écrit : > StepH wrote: > >> 1./ Is each "display" must responsible to acquire/read the data ? >> 2./ Or an engine collect the data then send them to each "display" ? >> >> >> > I'd keep it simple: > > - DataCollector class > asociated with one or more display instances (implemented as a list of > display subscribers) > it collects data from a source and notifies each subscribed display > that new data is available. > could something like a 'collect' method which performs: > > for display in self.subscribed_displays: > display.update( data ) > > > - Display class > just a simple display class with an "update" method > it should be able to receive new data > and display new data > (those 2 actions could be implemented in different methods, you might > not want to display everytime new data is available... maybe you might > want to consolidate data in some way and output it at some high interval) Ok, it was my first idea too... > >> Also, how to "anim" this ? >> >> 1./ Via a timer ? >> 2./ Via a simple loop (read/update display/pause/read user key) >> >> > > a simple loop could do it > - handle user events > - collect data > - update displays > - sleep > > > Here i've a prob. (due to the fact that I start both with Python & TkInter). In TkInter, you run your app by launching a mainloop() routine, right ? So, how, in my forever loop (handle user events / Collect data / Update Display / Sleep) handle the user data ? Sure, i can (i suppose), log user activity (via the event send by the Tk underlayer), the "poll" theses event in my for ever loop ? But in this case, are these event will be correctly generated (by Tk) ? How to "give the hand" to Tk in such scenario ? Thanks for your help. StepH. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python on a public library computer
Christos TZOTZIOY Georgiou wrote: > I am not sure I will help you (uncertainty based on the part I snipped), > but the part so far can be easilly solved if you install Python for > single user inside the "Documents and settings\" folder (or > whatever it is called). I did in a similar case. .msi is blocked by the appguard. I knew that because I tried it a week ago, but just to be sure I tried again. > End of reply here; and now for some completely minor python success > story. [snip story] > Thanks, that was a nice story! However I still think ... But you know what I think by now don't you :-) Anton '[EMAIL PROTECTED]>>> import NNTP ' -- http://mail.python.org/mailman/listinfo/python-list
Sorting x lists based on one list
Hi, I'm looking for an easy algorithm - maybe Python can help: I start with X lists which intial sort is based on list #1. I want to reverse sort list #1 and have all other lists sorted accordingly. Any idea is welcome. Regards, Philippe -- http://mail.python.org/mailman/listinfo/python-list
Re: Image.putpalette(Colors)?
Oliver Albrecht wrote: > Has somebody a example-script how i can put a other palette to a image? here's one of the first google hits for "PIL putpalette": http://effbot.org/zone/pil-pseudocolor.htm > (after this the image should have similar outlook) similar to what? -- http://mail.python.org/mailman/listinfo/python-list
Re: Sorting x lists based on one list ... maybe an example would make sense:
l1 = ['a','b','c'] l2 = ['toto','titi','tata'] # 'toto' refers to 'a', 'titi' to b' l3 = ['foo','bar','doe'] # 'foo' refers to 'a' I want to reverse sort l1 and have l2 and l3 follow accordingly. Regards, Philippe Philippe C. Martin wrote: > Hi, > > I'm looking for an easy algorithm - maybe Python can help: > > I start with X lists which intial sort is based on list #1. > > I want to reverse sort list #1 and have all other lists sorted > accordingly. > > Any idea is welcome. > > Regards, > > Philippe -- http://mail.python.org/mailman/listinfo/python-list
Re: \r functionality
"Jake" <[EMAIL PROTECTED]> wrote: > in c and c++ there is a useful way to refresh an output line in printf > and cout using \r meta command. that's a control character that's printed to the terminal by printf/cout, not a "C or C++ meta command" to print the same character in Python, use the same character escape: print "\r", count, (note that if this works or not depends on the terminal you're sending the output to. most ordinary terminals handle it just fine, but if you're sending output to an IDE console window, it may not work as expected) -- http://mail.python.org/mailman/listinfo/python-list
Re: Python RPM and CentOS
The reasonable thing would be to use "yum".
> Not really a Python question, but I thought some on this list may be
> able to answer so here goes:
>
> I have several machines on which I must install CentOS. There are many
> updates to CentOS and it's very time consuming to do the updates over
> the network. I have a local copy of all of the updated rpms. Would it be
> reasonable to do something like this to upgrade them locally and more
> quickly than over the network???
>
> updated_rpms = [list of updated rpms]
>
> for f in updated_rpms:
>
> try:
> os.popen("/bin/rpm --nodeps -U %s" %f)
>
> except Exception, e:
> print e
>
>
> Thanks,
>
> rbt
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Re: Bug in Elementtree/Expat
[EMAIL PROTECTED] wrote: > I use Elementtree to parse an elementary SVG file (in fact, it is one > of the examples in the "SVG essentials" book). More precisely, it is > the fig0201.svg file in the second chapter. > The contents of the file are as follows (i hope it will be rendered > correctly): > "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd";> > > Default User Coordinates > Shows a rectangle on a grid in default user coordinates > height="200"/> > > > > > > xml.parsers.expat.ExpatError: unbound prefix: line 6, column 1 > The problem seems to lie with the xlink:href tag. If i remove the xlink > namespace, it then does not produce a traceback. so where in that file do you see an xlink declaration? (elementtree doesn't fetch external DTD:s, so putting in the DTD file doesn't really help). adding xmlns:xlink="http://www.w3.org/1999/xlink"; to the "svg" element should make the problem go away. -- http://mail.python.org/mailman/listinfo/python-list
Re: Sorting x lists based on one list ... maybe an example would make sense:
> Philippe C. Martin wrote: > >> I'm looking for an easy algorithm - maybe Python can help: >> I start with X lists which intial sort is based on list #1. >> I want to reverse sort list #1 and have all other lists sorted >> accordingly. One way, using a helper list with indices: >>> l1 = ['a','b','c'] >>> l2 = ['toto','titi','tata'] # 'toto' refers to 'a', 'titi' to b' >>> l3 = ['foo','bar','doe'] # 'foo' refers to 'a' >>> indices = sorted(range(len(l1)), key=l1.__getitem__, reverse=True) >>> for items in l1, l2, l3: ... items[:] = [items[i] for i in indices] ... >>> l1 ['c', 'b', 'a'] >>> l2 ['tata', 'titi', 'toto'] >>> l3 ['doe', 'bar', 'foo'] Another way would be to merge the three lists into one of 3-tuples, sort, and unmerge, similarly to the DSU pattern -- which raises the question: why are you using three lists in the first place? Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Sorting x lists based on one list ... maybe an example would make sense:
> Another way would be to merge the three lists into one of 3-tuples, sort, > and unmerge, similarly to the DSU pattern -- which raises the question: > why are you using three lists in the first place? :-) Thanks, the lists will evolve and are also stored in 'csv' format in external files at one point. I cannot use dictionaries because I need to control the sorting (hash). In this specific case, list 1 represents students with their information, list 2 represents assignments with information such as weight, term, max grade ... and list 3 the actual grades. Regards, Philippe Peter Otten wrote: >> Philippe C. Martin wrote: >> >>> I'm looking for an easy algorithm - maybe Python can help: >>> I start with X lists which intial sort is based on list #1. >>> I want to reverse sort list #1 and have all other lists sorted >>> accordingly. > > One way, using a helper list with indices: > l1 = ['a','b','c'] l2 = ['toto','titi','tata'] # 'toto' refers to 'a', 'titi' to b' l3 = ['foo','bar','doe'] # 'foo' refers to 'a' indices = sorted(range(len(l1)), key=l1.__getitem__, reverse=True) for items in l1, l2, l3: > ... items[:] = [items[i] for i in indices] > ... l1 > ['c', 'b', 'a'] l2 > ['tata', 'titi', 'toto'] l3 > ['doe', 'bar', 'foo'] > > Another way would be to merge the three lists into one of 3-tuples, sort, > and unmerge, similarly to the DSU pattern -- which raises the question: > why are you using three lists in the first place? > > Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Timothy Smith wrote: > Ivan Voras wrote: > > >Paul Rubin wrote: > > > > > > > >>>your active code is then in some library.zip shared between the > >>>three, and you need never change alice.exe, bob.exe, and carol.exe > >>> > >>> > >>I think I understand what you're saying and it sounds like a very > >>good idea. Thanks. > >> > >> > > > >One thing about updating files - sorry if I'm stating general and > >universal knowledge, but beware that on Windows you can't delete and/or > >replace a file if it's opened by any process. > > > > > hence i found you must do this immediately after updating > > sys.path_importer_cache.clear() > zipimport._zip_directory_cache.clear() > > then unload your app I don't think it's a good idea to update files of a running application. It's better to copy the current version into another directory and after successful update switch over to the new version. Dirs during update: c:\program files\mysoftware\current c:\program files\mysoftware\latest post update c:\program files\mysoftware\previous c:\program files\mysoftware\current The advantage of the approach of keeping the previous version is that your customers can always switch back to the previous version even if the network is not available or your update server is down. It's like an undo button. If the users know that they can easily downgrade, they will more willing to upgrade. Serge. -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
Bernhard Holzmayer wrote: > Paul Rubin wrote: > > >>As what must be penance for something or other, I'm needing to release >>a Python app for use under Windows XP. Please be gentle with me since >>I'm a Un*x weenie and the only thing I've had much practice with under >>Windows is rebooting it. > > > I can feel your unhappiness, and I share it. Hi Paul! > Here are some hints... > > >>My app contains three different programs (say alice.py, bob.py, and >>carol.py) that need to be independently launchable, and a dozen or so >>other .py files that get imported into those first three. What I'd >>really really like is to make a single installer called (say) >>"app.exe". Launching app.exe should completely install Python, unpack >>all the necessary modules, and make three icons (alice, bob, carol) on >>the desktop. > > > Since your installer needs to run before Python is installed, you need > something else. Go to http://www.wisesolutions.com Or, you could use a simple bat script... that's what I do. -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows distribution suggestions?
On 2005-05-17, Paul Rubin wrote: > As what must be penance for something or other, I'm needing to release > a Python app for use under Windows XP. I'm a Unix guy who occasionally ships a Python app for Win32, and I always recommend py2exe and inno setup: py2exe http://starship.python.net/crew/theller/py2exe/ inno setup http://www.jrsoftware.org/isinfo.php Inno setup is as good as any other installer, and it's free. -- Grant Edwards grante Yow! Did I SELL OUT yet?? at visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Design Question. Data Acquisition/Display related.
StepH wrote: >>a simple loop could do it >> - handle user events >> - collect data >> - update displays >> - sleep >> >> >Here i've a prob. (due to the fact that I start both with Python & >TkInter). In TkInter, you run your app by launching a mainloop() >routine, right ? So, how, in my forever loop (handle user events / >Collect data / Update Display / Sleep) handle the user data ? > >Sure, i can (i suppose), log user activity (via the event send by the Tk >underlayer), the "poll" theses event in my for ever loop ? But in this >case, are these event will be correctly generated (by Tk) ? How to >"give the hand" to Tk in such scenario ? > >Thanks for your help. > >StepH. > > oops, sorry, I was thinking of a 'pygame' kind of loop, where you have control over it. I dont have experience on Tk, I allways use wxPython or pygame for gui's. you can forget about the loop I mentioned... it doesn't apply to event-driven applications where you have no control over the loop. you'd be using a timer that triggers a tick method at a certain interval, in that tick method you could tell your data collectors to collect data... then the data collectors would trigger all its subscribed displays's "update" function, so they draw the new available data, just like the "for display in self.subscribed_displays: display.update(data)". so it comes to something like this: tk mainloop is set to call tick() every 100ms through a timer. tick() will iterate through all data collectors and call their "collect" method each data collector will then collect data and iterate through all asociated displays calling their respective 'update' method on each. of course there are plenty of ways to design an app, this is just an idea. hope it helps, Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: Bug in Elementtree/Expat
Fredrik Lundh wrote: > > adding > > xmlns:xlink="http://www.w3.org/1999/xlink"; > > to the "svg" element should make the problem go away. Thanks for the tip. It indeed solves the problem. Most examples in the book do not include such a declaration and yet are properly rendered by Internet Explorer. Is it mandatory and why is it that Expat crashes on it? Alain -- http://mail.python.org/mailman/listinfo/python-list
Reading image dimensions with PIL
Hi,
I'm writing an app that downloads images. It rejects images that are
under a certain size - whithout downloading them completely. I've
implemented this using PIL, by downloading the first K and trying to
create a PIL image with it. PIL raises an exception because the file is
incomplete, but the image object is initialised with the image
dimensions, which is what I need. It actualy works well enough, but I'm
concerened about side-effects - since it seems an unconventional way of
working with PIL. Can anyone see any problems with doing this? Or a
better method?
Thanks,
Will McGugan
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"".join( [ {'*':'@','^':'.'}.get(c,None) or chr(97+(ord(c)-84)%26) for c
in "jvyy*jvyyzpthtna^pbz" ] )
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Re: Python forum
On 2005-05-17, Jonas Melian <[EMAIL PROTECTED]> wrote: > I'm going to say a suggestion, why don't you create a forum > like the one of Ruby (http://www.rubyforums.com/)? for the > novices this is a great help, better than a mail list Says you. I prever a newsgroup. Mailing lists are in second place and web forums a very distant third. I really don't see how pointing Mozilla or Thunderbird at a newsgroup isn't any harder than pointing it at a web forum. > I know that you have python-list, it's both an email and a usenet list. And both are far better than web forums. > But I think that a forum is great for the learning. The test > is in gentoo's forums. They are a lot of experienced people > answering questions without any problem and it goes very well Except for the torture of using a web forum's UI. [In case you can't tell, I hate web forums. I've never seen a single one with a suable UI.] -- Grant Edwards grante Yow! .. My vaseline is at RUNNING... visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem listing services with wmi
Hello Tim, thanks for replying,
>For your
>information, what the code is doing behind the scenes is the following:
>
>
>
>import win32com.client
>
>c = win32com.client.GetObject (
>
> "winmgmts:{impersonationLevel=Impersonate,authenticationLevel=Default}/root/cimv2"
>)
>for service in c.ExecQuery ("SELECT * FROM Win32_Service"):
> if service.Properties_ ("State").Value == "Stopped":
>print service.Properties_ ("Caption").Value
>print service.Properties_ ("State").Value
>
>
>
>
Running this code seems to go through the 87 first services in the list
returned by ExecQuery, then stops with the following error :
Traceback (most recent call last):
File "", line 1, in ?
File "G:\Python-2.4\Lib\site-packages\win32com\client\util.py", line
83, in next
return _get_good_object_(self._iter_.next())
pywintypes.com_error: (-2147217398, 'OLE error 0x8004100a', None, None)
Could there be such a thing as a "null pointer" in the list at position
88? Or is that not possible in Python? Would the iterator just stop at a
null value? As I said, I'm pretty new to Python so I'm just throwing
around ideas here.
>
>
>set wmi = GetObject ("winmgmts:{impersonationLevel=impersonate}")
>set ServiceSet = wmi.InstancesOf ("Win32_Service")
>for each Service in ServiceSet
> WScript.Echo Service.Description
>Next
>
>
>
>
This gives me the first 87 services as well, and then stops with this
message :
C:\Documents and Settings\guayj\Desktop\bob.vbs(7, 1) (null): 0x8004100A
So it would seem that the 3 methods give the same result. As to which
service it has gotten to when it gets to position 88 in the list,
obviously I can't find out with a script, and it seems that the list
isn't in any order I can see, so I couldn't even venture a guess... I'll
try looking if there's a service in my list that isn't valid (points to
an uninstalled program for example) or something like that... But if you
have other ideas please let me know.
>PS I realise that by now you've probably moved on from
>this approach, but if you did manage to pin down a problem
>we could address, I'd be very glad to address it.
>
>
Not at all, this is a small project I'm using to try and learn Python...
I'm currently on summer break before I start my Masters, so I have the
luxury of keeping this on the back burner until I find a fix... Thanks
for your help!
J-S
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___
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Re: Sorting x lists based on one list ... maybe an example would make sense:
I will look at that merge/unmerge thing Peter Otten wrote: >> Philippe C. Martin wrote: >> >>> I'm looking for an easy algorithm - maybe Python can help: >>> I start with X lists which intial sort is based on list #1. >>> I want to reverse sort list #1 and have all other lists sorted >>> accordingly. > > One way, using a helper list with indices: > l1 = ['a','b','c'] l2 = ['toto','titi','tata'] # 'toto' refers to 'a', 'titi' to b' l3 = ['foo','bar','doe'] # 'foo' refers to 'a' indices = sorted(range(len(l1)), key=l1.__getitem__, reverse=True) for items in l1, l2, l3: > ... items[:] = [items[i] for i in indices] > ... l1 > ['c', 'b', 'a'] l2 > ['tata', 'titi', 'toto'] l3 > ['doe', 'bar', 'foo'] > > Another way would be to merge the three lists into one of 3-tuples, sort, > and unmerge, similarly to the DSU pattern -- which raises the question: > why are you using three lists in the first place? > > Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading image dimensions with PIL
Will McGugan wrote: > I'm writing an app that downloads images. It rejects images that are > under a certain size - whithout downloading them completely. I've > implemented this using PIL, by downloading the first K and trying to > create a PIL image with it. PIL raises an exception because the file is > incomplete, but the image object is initialised with the image > dimensions, which is what I need. It actualy works well enough, but I'm > concerened about side-effects - since it seems an unconventional way of > working with PIL. Can anyone see any problems with doing this? Or a > better method? If you're tossing images that are too _small_, is there any benefit to not downloading the whole image, checking it, and then throwing it away? Checking just the first 1K probably won't save you too much time unless you're over a modem. Are you using a byte-range HTTP request to pull down the images or just a normal GET (via e.g. urllib)? If you're not using a byte-range request, then all of the data is already on its way so maybe you could go ahead and get it all. But hey, if your current approach works... :) It _is_ a bit unconventional, so to reduce the risk you could test it on a decent mix of image types (normal JPEG, progressive JPEG, normal & progressive GIF, png, etc.) - just to make sure PIL is able to handle partial data for all different types you might encounter. Also, if PIL can't handle the partial data, can you reliably detect that scenario? If so, you could detect that case and use the download-it-all-and-check approach as a failsafe. -Dave -- http://mail.python.org/mailman/listinfo/python-list
Re: Python forum
Grant Edwards wrote: > On 2005-05-17, Jonas Melian <[EMAIL PROTECTED]> wrote: >>I'm going to say a suggestion, why don't you create a forum >>like the one of Ruby (http://www.rubyforums.com/)? for the >>novices this is a great help, better than a mail list [snip] >>But I think that a forum is great for the learning. The test >>is in gentoo's forums. They are a lot of experienced people >>answering questions without any problem and it goes very well > > > Except for the torture of using a web forum's UI. > > [In case you can't tell, I hate web forums. I've never seen a > single one with a suable UI.] Amen! Generally they are an abomination. To make matters worse, many forums that become popular are saddled with so many advertisements that moving from one message to another becomes a... grueling... lesson... in... patience. -Dave -- http://mail.python.org/mailman/listinfo/python-list
processing a Very Large file
Hi, I'm trying to manually parse a dataset stored in a file. The data should be converted into Python objects. Here is an example of a single line of a (small) dataset: 3 13 17 19 -626177023 -1688330994 -834622062 -409108332 297174549 955187488 589884464 -1547848504 857311165 585616830 -749910209 194940864 -1102778558 -1282985276 -1220931512 792256075 -340699912 1496177106 1760327384 -1068195107 95705193 1286147818 -416474772 745439854 1932457456 -1266423822 -1150051085 1359928308 129778935 1235905400 532121853 The first integer specifies the length of a tuple object. In this case, the tuple has three element: (13, 17, 19) The other values (-626177023 to 532121853) are elements of a Set. I use the following code to process a file: from time import time from sets import Set from string import split file = 'pathtable_ht.dat' result = [] start_time = time () f=open(file,'r') for line in f: splitres = line.split() tuple_size = int(splitres[0])+1 path_tuple = tuple(splitres[1:tuple_size]) conflicts = Set(map(int,splitres[tuple_size:-1])) # do something with 'path_tuple' and 'conflicts' # ... do some processing ... result.append(( path_tuple, conflicts)) f.close() print time() - start_time The elements (integer objects) in these Sets are being shared between the sets, in fact, there are as many distinct element as there are lines in the file (eg 1000 lines -> 1000 distinct set elements). AFAIK, the elements are stored only once and each Set contains a pointer to the actual object This works fine with relatively small datasets, but it doesn't work at all with large datasets (4500 lines, 45000 chars per line). After a few seconds of loading, all main memory is consumed by the Python process and the computer starts swapping. After a few more seconds, CPU usage drops from 99% to 1% and all swap memory is consumed: Mem:386540k total, 380848k used, 4692k free, 796k buffers Swap: 562232k total, 562232k used,0k free,27416k cached At this point, my computer becomes unusable. I'd like to know if I should buy some more memory (a few GB?) or if it is possible to make my code more memory efficient. Thanks in advance, Stan. -- http://mail.python.org/mailman/listinfo/python-list
Type question
Hello, is this call assumed to be True in any case? result = type(SomeClass) is SomeClass I've written a proxy class which shadows a real object. If you call type(proxyobj) it returns the type of the proxyobject and not the type of the shadowed object. Example: p = proxy(shadowobj()) result1 = type(p) is shadowobj # will return False result2 = isinstance(p, shadowobj) # will return True So the first call compares the id()s of both types, while the second calll seems to work different. I've tried to use a proxy metaclass that creates new objects with the name 'shadowobj'. So print type(p) print type(shadowobj()) will look exactly the same. however their id()s compare different and that's why the 1st test doesn't work as I'd expect it to work. Can somebody tell me why the id()s compare different for the same type names? Here's the metaclass: class ProxyMeta(type): def __new__(self, classname, bases, classdict): return type.__new__(self, 'shadowobj', bases, classdict) class Proxy(object): __metaclass__ = ProxyMeta Why is (type(Proxy) is shadowobj == False)? Shouldn't type.__new__ reuse the existing shadowobj type and increase its refcount instead of creating a new instance of it? Then the id()s would compare the same. So, finally, is checking for types with 'is' as shown above just wrong and one should use isinstance or is my proxy class showing bad behaviour or is this a bug in type.__new__? -Matthias -- http://mail.python.org/mailman/listinfo/python-list
Re: Quick Reference from module doc strings.
Michele Simionato wrote: >>Do you have any feature suggestions, additional information that > > could > >>go in, something that would extend the content in some way and make > > it > >>more useful? > > > I have written something similar which I use all the time. It generates > ReST > output which I can browse with "less" from the command line, as well as > HTML > output and PDF output that I can print. The hard work is done by > docutils, of course. > I have options to specify if I want to least private names or not, and > to specify > if I want an analytical index to be generated or not. Also, the HTML > output > contains hyperlinks to the original source code, so I can see it with > a click. > I can feed to "minidoc" whole packages (it works recursively on > subpackages, so everything is documented). > > It was unvaluable in my struggle with Zope. > > Michele Simionato > Hi Michele, Sound great! Adding a command line parser, I'm going to add a brief command line parser to it today, but nothing as elaborate as you have already. Could you post a part of the output as an example? How is the index built? The direction I'm going is to build a database/dictionary with each individual item as a record. Maybe feed it the whole lib directory, then to be able to generate cross module/package lists by subject or keyword. I'm not exactly sure how to connect everything together yet. This is a figure it out as I go project, but I think it's worth trying. Cheers, _Ron -- http://mail.python.org/mailman/listinfo/python-list
RE: Problem listing services with wmi
[... snip results ...]
| So it would seem that the 3 methods give the same result. As to which
| service it has gotten to when it gets to position 88 in the list,
| obviously I can't find out with a script, and it seems that the list
| isn't in any order I can see, so I couldn't even venture a
| guess... I'll
| try looking if there's a service in my list that isn't valid
| (points to
| an uninstalled program for example) or something like that...
| But if you
| have other ideas please let me know.
Well I honestly don't know if this will go any further,
but the following code uses the win32service module from
pywin32 to collect the service information, on the off-chance
that it *won't* fail where WMI does. I can't easily test it
since the script doesn't raise an error on my machine.
At the end, it tries to print out the differences between
the win32-collected info and the wmi-collected info.
#
# Not sure if you're running 2.3/2.4
#
try:
set
except NameError:
from sets import Set as set
##
## Taken from a post to c.l.py by William J. Rice
##
import win32service
import win32con
accessSCM = win32con.GENERIC_READ
hscm = win32service.OpenSCManager (None, None, accessSCM)
win32_names = set ()
for service_info in win32service.EnumServicesStatus(hscm):
win32_names.add (service_info[1])
import win32com.client
c = win32com.client.GetObject (
"winmgmts:{impersonationLevel=Impersonate,authenticationLevel=Default}/root/cimv2"
)
wmi_names = set ()
for service in c.ExecQuery ("SELECT * FROM Win32_Service"):
try:
short_name = service.Properties_ ("Caption").Value
except:
pass
else:
wmi_names.add (short_name)
print "only in win32:", ", ".join (win32_names - wmi_names)
print
print "only in wmi:", ", ".join (wmi_names - win32_names)
print
Let me know if anything shows up.
TJG
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Re: Unique Elements in a List
> One reasonable solution might be as follows:
>
> def unique_elts(seq):
> elts = {}
> for pos, elt in enumerate(seq):
> elts.setdefault(elt, []).append(pos)
>
> return [ (x, p[0]) for (x, p) in elts.iteritems()
> if len(p) == 1 ]
>
Minor tweak to conserve space:
def bachelor_filter(iter_over_hashables):
B={}
for index, elem in enumerate(iter_over_hashables):
if B.setdefault(elem, index) != index:
B[elem]=None
return [pair for pair in B.items() if pair[1] is not None]
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Re: processing a Very Large file
[DJTB]
> I'm trying to manually parse a dataset stored in a file. The data should be
> converted into Python objects.
>
> Here is an example of a single line of a (small) dataset:
>
> 3 13 17 19 -626177023 -1688330994 -834622062 -409108332 297174549 955187488
> 589884464 -1547848504 857311165 585616830 -749910209 194940864 -1102778558
> -1282985276 -1220931512 792256075 -340699912 1496177106 1760327384
> -1068195107 95705193 1286147818 -416474772 745439854 1932457456 -1266423822
> -1150051085 1359928308 129778935 1235905400 532121853
>
> The first integer specifies the length of a tuple object. In this case, the
> tuple has three element: (13, 17, 19)
> The other values (-626177023 to 532121853) are elements of a Set.
>
> I use the following code to process a file:
>
> from time import time
> from sets import Set
> from string import split
Note that you don't use string.split later.
> file = 'pathtable_ht.dat'
> result = []
> start_time = time ()
> f=open(file,'r')
> for line in f:
>splitres = line.split()
Since they're all integers, may as well:
splitres = map(int, line.split())
here and skip repeated int() calls later.
>tuple_size = int(splitres[0])+1
>path_tuple = tuple(splitres[1:tuple_size])
>conflicts = Set(map(int,splitres[tuple_size:-1]))
Do you really mean to throw away the last value on the line? That is,
why is the slice here [tuple_size:-1] rather than [tuple_size:]?
># do something with 'path_tuple' and 'conflicts'
># ... do some processing ...
>result.append(( path_tuple, conflicts))
>
> f.close()
> print time() - start_time
>
> The elements (integer objects) in these Sets are being shared between the
> sets, in fact, there are as many distinct element as there are lines in the
> file (eg 1000 lines -> 1000 distinct set elements). AFAIK, the elements are
> stored only once and each Set contains a pointer to the actual object
Only "small" integers are stored uniquely; e.g., these aren't:
>>> 100 * 100 is 100 * 100
False
>>> int("12345") is int("12345")
False
You could manually do something akin to Python's "string interning" to
store ints uniquely, like:
int_table = {}
def uniqueint(i):
return int_table.setdefault(i, i)
Then, e.g.,
>>> uniqueint(100 * 100) is uniqueint(100 * 100)
True
>>> uniqueint(int("12345")) is uniqueint(int("12345"))
True
Doing Set(map(uniqueint, etc)) would then feed truly shared int
(and/or long) objects to the Set constructor.
> This works fine with relatively small datasets, but it doesn't work at all
> with large datasets (4500 lines, 45000 chars per line).
Well, chars/line doesn't mean anything to us. Knowing # of set
elements/line might help. Say there are 4500 per line. Then you've
got about 20 million integers. That will consume at least several 100
MB if you don't work to share duplicates. But if you do so work, it
should cut the memory burden by a factor of thousands.
> After a few seconds of loading, all main memory is consumed by the Python
> process and the computer starts swapping. After a few more seconds, CPU
> usage drops from 99% to 1% and all swap memory is consumed:
>
> Mem:386540k total, 380848k used, 4692k free, 796k buffers
> Swap: 562232k total, 562232k used,0k free,27416k cached
>
> At this point, my computer becomes unusable.
>
> I'd like to know if I should buy some more memory (a few GB?) or if it is
> possible to make my code more memory efficient.
See above for the latter. If you have a 32-bit processor, you won't
be able to _address_ more than a few GB anyway. Still, 384MB of RAM
is on the light side these days .
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Re: Type question
[EMAIL PROTECTED] wrote: > Hello, > > is this call assumed to be True in any case? > > result = type(SomeClass) is SomeClass > > I've written a proxy class which shadows a real object. If you call > type(proxyobj) it returns the type of the proxyobject and not the type > of the shadowed object. Example: > > p = proxy(shadowobj()) > result1 = type(p) is shadowobj # will return False > result2 = isinstance(p, shadowobj) # will return True > > So the first call compares the id()s of both types, while the second > calll seems to work different. > I've tried to use a proxy metaclass that creates new objects with the > name 'shadowobj'. So > > print type(p) > print type(shadowobj()) > > will look exactly the same. isinstance is not a law. It's just a convention. You don't actually need to implement it. Consider PEP 246, I believe, it is the right way to do what you want to do. isinstance and metaclasses are not. Instead of writing if not isinstance(obj, class): report error ask your users to write obj = adapt(obj, Interface) instead of dispatch code like if isinstance(obj, thisclass): do this elif isinstance(obj, thatclass): do that else: report error ask the users to write: if kind(obj) is ThisKind: do this elif kind(obj) is ThatKind: do that else: report error where kind can be defined as def kind(obj): return getattr(obj, 'kind', None) Serge. -- http://mail.python.org/mailman/listinfo/python-list
newbie running IDLE with command line arguments
Hi, I am trying to use IDLE in order to test my program. My program is the following: import sys, socket size = 1024 host, port, message = sys.argv[1], int(sys.argv[2]), sys.argv[3] print host How do I run this program on IDLE? I trying Run->Run Module but it gives me: Traceback (most recent call last): File "C:\Python24\userprograms\simpleclient.py", line 5, in -toplevel- host, port, message = sys.argv[1], int(sys.argv[2]), sys.argv[3] IndexError: list index out of range How do I enter the command arguments? Thanks, C29 -- http://mail.python.org/mailman/listinfo/python-list
Re: Quick Reference from module doc strings.
Ron Adam: > Sound great! Adding a command line parser, I'm going to add a brief > command line parser to it today, but nothing as elaborate as you have > already. Could you post a part of the output as an example? How is the > index built? For the command line parser, see http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/278844 Here is an example of output: http://www.phyast.pitt.edu/~micheles/python/ms.html (it is a package called "ms" (as "My Stuff") where I put my utilities). The system works for module of the standard library too, but since most of the time they do not have docstrings in reST format, there are ugly formatting errors. But this is a bug of the standard library, not of my tool ;) For the index: "minidoc" associates a footnote number to every name, and then prints the names in alphabetical order. You can reach the documentation for that name with a click. Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem listing services with wmi
Hi again Tim, >Well I honestly don't know if this will go any further, >but the following code uses the win32service module from >pywin32 to collect the service information, on the off-chance >that it *won't* fail where WMI does. I can't easily test it >since the script doesn't raise an error on my machine. > > Seems like your hunch was right, the first loop completes correctly. Adding a counter to both loops shows that getting services from win32service.EnumServicesStatus() gets 108 services, and getting them through WMI gets to 87 and then halts with the previously mentioned error : Traceback (most recent call last): File "", line 1, in ? File "G:\Python-2.4\Lib\site-packages\win32com\client\util.py", line 83, in next return _get_good_object_(self._iter_.next()) pywintypes.com_error: (-2147217398, 'OLE error 0x8004100a', None, None) From examining your code I imagine you tried to catch the exception, but it didn't work because the exception is thrown on the "for" line and not when getting the service's Caption property... So it stopped at 87 anyways. And indeed, the "only in win32" list shows 21 entries ( len(win32_names - wmi_names) = 108-87 = 21 ). [...snip code...] ># Not sure if you're running 2.3/2.4 > > Python 2.4 on Windows XP SP2 here. Do you think we're getting anywhere with this? If not, then I'll just use the "win32" method of getting the service list, even though it isn't as pretty. I don't want to waste your time on something that may have more to do with my machine than anything else... But if you want to try and get to the bottom of this, I have no problem with trying out other suggestions. Thanks a lot, just by your small scripts I've already learned a lot more about Python! J-S -- ___ Jean-Sébastien Guay [EMAIL PROTECTED] http://whitestar02.webhop.org/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Python forum
Dave Brueck wrote: > Grant Edwards wrote: > >> >> Except for the torture of using a web forum's UI. >> >> [In case you can't tell, I hate web forums. I've never seen a >> single one with a suable UI.] > > > Amen! Generally they are an abomination. > > To make matters worse, many forums that become popular are saddled with > so many advertisements that moving from one message to another becomes > a... grueling... lesson... in... patience. It may seem snobish, but my main gripe with most of the web-forums I've seen is the people using them. There are far too many content-free "Me too" posts, which are horribly difficult to filter out (due to the poor UI). It's partly the web-forum's fault - the really bad ones have posts with some cute/animated smiley as the sole content. It's rare that usenet has such posts, because a colon and a right paren in text doesn't seem nearly as interesting as some saccarine singing, dancing, yellow blob. -- http://mail.python.org/mailman/listinfo/python-list
os.popen vs os.system
Is it more appropriate to use os.popen or os.system on a windows XP client? I'm calling the operting system's shutdown function like this: restart = os.popen(shutdown -r -f) print restart.read() restart.close() If it matters, I'm doing this remotely over sockets. -- http://mail.python.org/mailman/listinfo/python-list
