🌐 Mailman 3 July 2008 - Python-list - python.org

Re: Error from zipfile
by Marc 'BlackJack' Rintsch July 1, 2008

July 1, 2008

On Tue, 01 Jul 2008 16:38:23 +0100, Wesley Brooks wrote: > Dear Users, > > I'm having a problem when trying to move script from Linux to Windows. > A zipfile opperation is failing with the message: > > "BadZipFile: File is not a zip file" > > I have a simple scripts that reads a zip file in the same way as any > other file into a string, then sends it across to a network where it > is saved as perusual into a file, […] Are you sure you read and save the file in binary mode, especially on windows!? Ciao, Marc 'BlackJack' Rintsch

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Installing paramiko and pycrypto
by cokofreedom＠gmail.com July 1, 2008

July 1, 2008

I am really stuck presently, trying to install these on my Windows XP. I have downloaded easy_install and it is now in Python25\Scripts but none of the commands I have read in either program folder have worked to install them. I was hoping someone could give me a step by step guide to installing these so I can use paramiko to perform SSH. Or at least point me in the right direction... Thanks Coko

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Error from zipfile
by Wesley Brooks July 1, 2008

July 1, 2008

Dear Users, I'm having a problem when trying to move script from Linux to Windows. A zipfile opperation is failing with the message: "BadZipFile: File is not a zip file" I have a simple scripts that reads a zip file in the same way as any other file into a string, then sends it across to a network where it is saved as perusual into a file, then read in and processed by zipfile. I've tried adding the flag to allow 64 bit and even using uncompressed zip files. Niether fixes the problem. The zip file and contents were created on linux. To be certain that was not the issue I have emptied the zip file, created a new one, opend all the files in wordpad and saved them, then put the contents into the new file. Still no joy. Any help would be greatly appreciated. On linux I'm running python 2.5 and on windows it is 2.4. Thanks, Wesley Brooks.

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Scope and program structure problems
by John Dann July 1, 2008

July 1, 2008

Trying to learn Python here, but getting tangled up with variable scope across functions, modules etc and associated problems. Can anyone advise please? Learning project is a GUI-based (wxPython) Python program that needs to access external data across a serial port. The first thing that I need the program to do when it starts up is to check that it can see the serial port, the first step of which is to check that it can import the pySerial module, and display an appropriate message in the statusbar of the main frame. (I know there may be other ways of doing this but this is what I'm trying to do currently and I'd like to understand how to make this approach work robustly even if there are other options.) So it seems that if I want to write to the frame's statusbar, I can't do anything re serial import until the frame is initialising. And I can't put any serial import code after the app.Mainloop() code line because it won't run until the frame closes. In other words, I seem to be stuck with importing the serial library either in the __init__ function or - if implemented slightly differently - in a separate function of the wxPython Frame class, ie a code structure of: ----------- # Can't put serial import code here because there's no GUI yet to send messages to. Class Frame(wx.Frame) def __init__() etc #code to check and use serial port has to go below?? def CheckSerial() # eg triggered by appropriate menu click event Try: import serial etc ser = Serial.etc # set ser object as handle to serial port def UseSerial(): # Code to perform serial IO app=App(wx.App) app.MainLoop() # Can't put serial import code here because it won't execute until frame closes? ----------- But then I hit another problem. If I set the object ser to point to the serial port in the CheckSerial function, then it's just got local scope within the function and can't be seen from the UseSerial function. So I've got 2 questions. The main one is whether there's any way of explicitly giving the ser object global scope in the code line: ser = Serial.etc # set ser object as handle to serial port And, second, does my overall description above reveal any serious misunderstanding about how best to handle this sort of problem in Python? Apologies for the long post and hope that my description is clear enough to make sense. JGD

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Disabling the magic "last expression" _ variable
by Koen Vossen July 1, 2008

July 1, 2008

A project I'm currently working on uses Turbogears as a framework. I'd like to interact with it using the tg-admin shell. We also use gettext's _() function for internationalization. Now, this function is overwritten in interactive mode, which causes annoying exceptions. Is it possible to disable this behavior?

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frame grabber hardware
by rubbishemail＠web.de July 1, 2008

July 1, 2008

Hello, can anybody recommend a simple USB or PCI framegrabber with video input that runs under xp and has a python driver available? I just want to get the image into a file, no special requirements. Thank you Daniel

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Looping-related Memory Leak
by Tom Davis July 1, 2008

July 1, 2008

I am having a problem where a long-running function will cause a memory leak / balloon for reasons I cannot figure out. Essentially, I loop through a directory of pickled files, load them, and run some other functions on them. In every case, each function uses only local variables and I even made sure to use `del` on each variable at the end of the loop. However, as the loop progresses the amount of memory used steadily increases. I had a related problem before where I would loop through a very large data-set of files and cache objects that were used to parse or otherwise operate on different files in the data-set. Once again, only local variables were used in the cached object's methods. After a while it got to the point where simply running these methods on the data took so long that I had to terminate the process (think, first iteration .01sec, 1000th iteration 10sec). The solution I found was to cause the cached objects to become "stale" after a certain number of uses and be deleted and re-instantiated. However, in the current case, there is no caching being done at all. Only local variables are involved. It would seem that over time objects take up more memory even when there are no attributes being added to them or altered. Has anyone experienced similar anomalies? Is this behavior to be expected for some other reason? If not, is there a common fix for it, i.e. manual GC or something?

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Re: [Employment] New TurboGears Job in Eugene, OR
by aahz＠pythoncraft.com July 1, 2008

July 1, 2008

In article <mailman.925.1214597105.1044.python-list(a)python.org>, Paul McNett <p(a)ulmcnett.com> wrote: >Silas Snider wrote: >> >> Full-time academic year position >> Salary range: $2819 - $4404 per month ( $16.26 - $25.41 per hour) >> >> The following knowledge, skills and experience are necessary for this >> position: >> >> Expert Python and SQL programming skills, and proficiency with >> Javascript, CSS, XHTML and web standards. Professional experience with >> open source projects, ideally using Turbogears and MySQL. Experience >> with Mac OSX Server or other server administration. Familiarity with >> version control. Skills using on-line documentation for open source >> packages. Wide knowledge of open-source software and ability to find, >> evaluate, learn and implement new open source technologies. > >They want an expert for a maximum of $25 per hour? If they find someone, >it'll be a pretty good bullshitter looking for experience. Note that it's an "academic year" position -- lots and lots of vacation time. This would actually be a good job for e.g. a retired person who doesn't need lots of money. Also note that Eugene is not exactly an area with a high cost of living. -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ "as long as we like the same operating system, things are cool." --piranha

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recursive import
by oj July 1, 2008

July 1, 2008

Hi, I'm just toying around with some ideas at the moment. Is there an easy and safe way to recursivly import all modules under a particular namespace? Say, I had modules: foo foo.bar foo.bar.baz foo.baz bar bar.baz I want to import all the modules in the foo namespace, so the first four modules in that list. Other then having those modules explicitly import their children, or explicitly importing them all from where I want to use them, can I do this? Should I do this? The idea is that function decorates 'register' functions in those modules, so they become available without having to have a list of all the modules that contain them, and without all the modules necessarily needing to know about each other.

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PyPy questions
by Allen July 1, 2008

July 1, 2008

I read the website of some information about PyPy, and how a translator translates the RPython code to C/CLI/Java/etc to be compiled to a native executable or something like that. Would it be possible, in PyPy, to write such an extension that could easily be compiled to native code from Python code? Is this functionality planned in a future release of it? Also, how is the source distributed (If I opt to use it I will end up compiling it on a system without an initial python install (a scratch linux system)), so does the source include the generated C code? B. Vanderburg II

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