🌐 Mailman 3 August 2006 - Python-list - python.org

Class definition within function
by Tomi Lindberg Aug. 2, 2006

Aug. 2, 2006

Hi, With the following function definition, is it possible to create an instance of class C outside the function f (and if it is, how)? And yes, I think this is one of those times when the real question is why :) >>> def f(): class C(object): def __init__(self): self.a = 'a' return C() >>> x = f() >>> x.a 'a' >>> y=f.C() Traceback (most recent call last): File "<pyshell#22>", line 1, in -toplevel- y=f.C() AttributeError: 'function' object has no attribute 'C' >>> -- Tomi Lindberg

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Can any one help?
by sujith h Aug. 2, 2006

Aug. 2, 2006

Hi am a newbie to pyparsing. But can any one help me to write small program to implement a small parser? Well is it possible to build a small calculator to do some arithmetic operations. Hope that i may get a reply... ~Sujith

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Zipping files/zipfile module
by OriginalBrownster Aug. 2, 2006

Aug. 2, 2006

This will probably sound like a very dumb question. I am trying to zip some files within a directory. I want to zip all the files within a directory called "temp" and have the zip archive saved in a directory with temp called ziptemp I was trying to read up on how to use the zipfile module python provides, but I cannot seem to find adequate documentation on function itself. Perhaps someone could help me in this task? I am guessing it must be something like the shutile module something like copy(src,dst) THank you Stephen

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Re: Windows vs. Linux
by Richard Brodie Aug. 2, 2006

Aug. 2, 2006

"Gerhard Fiedler" <gelists(a)gmail.com> wrote in message news:mailman.8845.1154526941.27775.python-list@python.org... >With the same reasoning one could say that the Unix creators should have > used the VMS (or any other existing) form. Only if they used Guido's time machine.

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Re: upgrading python...
by Paul Boddie Aug. 2, 2006

Aug. 2, 2006

bruce wrote: > > i'min a situation where i might need to upgrade python. i have the current > version of python for FC3. i might need to have the version for FC4. i built > the version that's on FC4 from the python source RPM. In principle this is a good idea, since you're aiming to manage your installed software correctly, allowing the package management system to permit uninstalls and the dependency management system to control dependencies. (In fact, I go as far as to make Debian/Ubuntu packages for virtually all Python packages I obtain independently of the system's package management utilities, just so that I can then use such utilities to install the software "properly".) > however, when i simply try to install the resulting RPM, the app gives me > dependency issues from apps that are dependent on the previous/current > version of python. This is one of the main issues with upgrading things upon which large numbers of other components or applications are dependent. Really, in order to preserve those applications, there would need to be an upgrade path for them (and their libraries) based on the newer version of Python, and I imagine that a lot of dependency management systems might refuse to offer a bulk upgrade, especially if some of the applications or libraries weren't available in an updated form. > i'm trying to figure out if there's a 'best' way to proceed. > > do i simply do the install, and force it to overwrite the current version of > python? No: you'll probably break various important applications. As you've seen, you'd need to offer yum all the potentially upgradable packages, and although various "distribution upgrade" operations are often possible, it's a major step just to try something out. > is there a way to point 'yum' at my new python RPM, and let yum take care of > dealing with any dependcy issues? and how would yum handle weird dependency > issues with RPMs that don't exist.. does yum have the ability to actually > build required apps from source? I don't really recall many details about yum, since its introduction came at the end of my Red Hat user experience, but yum is surely a dependency manager that itself doesn't build packages, although I can imagine it having features that could ask rpm (the package manager) to do so. As I note above, to get yum to understand the missing packages, you'd need to tell it about the Fedora Core 4 repository, but this is probably only done safely via a "distribution upgrade" that would be quite drastic. > comments/thoughts/etc... [...] > ps. the reason for this is that i'm looking at some of the newer > functionality in the 2.4 version of python over the 2.3 If I were in your position, I'd either do a "make altinstall" of Python 2.4 which should put Python 2.4 (as python2.4) alongside Python 2.3 (as python, python2.3) in /usr/bin (where you would give /usr as the installation prefix when configuring Python). Otherwise, I'd choose a different installation prefix (by default, Python installs into /usr/local) and then change your environment variables for affected users or programs to use Python from this new location in preference to the system installation of Python. In other words, you probably want to install an isolated version of Python for the special purpose of using newer functionality in your own applications. Anything else may be a lot of work, disruption and a lot more besides. Paul

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Re: Windows vs. Linux
by John Salerno Aug. 2, 2006

Aug. 2, 2006

Gerhard Fiedler wrote: > A design choice is not necessarily a > bad choice just because it turns out that some 30 years later there is a > similar common product whose creators made a different choice, and now > programmers have to cater to both. To be fair, this isn't the reason he gave for it being a bad design choice. His reason was that MS chose to use the escape character as their path separator. But of course I still agree with you that in either case it's not a judgment you can fairly make 30 years after the fact.

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Network Game in Python
by diffuser78＠gmail.com Aug. 2, 2006

Aug. 2, 2006

I have to create a small and simple GUI app in Python which is similar to a netwrok game. Let me expalain you. I need some suggestions. I might use wxPython for GUI because that is the only GUI oolkit I know. There are 6 players in the game. They are all connected though a LAN (possible an internal network). There is one main supervirsor who starts the game and other 5 are players. Once the supervisor starts the game, a move goes randomly to any player out of the 5 players. Once a player gets a move he has to act. Based on his action next move will be generated by supervisor and sent to some other player in the network. This process goes on untill the simulation time ends. Winners and Loosers are decided by some point system which supervisor keeps track of. Some questions I have are: 1. How can I manage network messages among the players. Should multicast be used or Actor should send the message to Supervisor and he sends to all. ? What python modules can be handy in these things. 2. How can I manage moves among players. What move a player makes is visible to all others in real time, so essentially all players have the same consistent view of the game. Only the person with access can actually make a move or carry out action. Any suggestion how to carry out this thing. 3. Shold I use a flat file or some database in mySQL to measure points etc ? I want to have a repository which keep tracks of all the mvoes in the system and who played what move etc..? Any suggestions on this. 4. If you have any other input, it will be greatly appreciated. Thanks

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Re: Windows vs. Linux
by Gerhard Fiedler Aug. 2, 2006

Aug. 2, 2006

On 2006-08-02 04:42:31, Sybren Stuvel wrote: > I never said "I would have known it better". I just said that IMO it > was a bad design choice ;-) Well, and I question your qualification to judge that. In order to say that, you would have to know the reasoning, would have to put it in the historical context and would have to be able to explain why that reasoning was wrong at the time. A design choice is not necessarily a bad choice just because it turns out that some 30 years later there is a similar common product whose creators made a different choice, and now programmers have to cater to both. With the same reasoning one could say that the Unix creators should have used the VMS (or any other existing) form. Gerhard

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Convert string to mathematical function
by jeremito Aug. 2, 2006

Aug. 2, 2006

I am extending python with C++ and need some help. I would like to convert a string to a mathematical function and then make this a C++ function. My C++ code would then refer to this function to calculate what it needs. For example I want to tell my function to calculate "x^2 + 3x +2", but later on I may want: "x + 3". Does anybody know how I can get an arbitrary string in Python (but proper mathematical function) turned into a C++ function? My one idea (although I don't know how to implement it, I'm still new at this) is to pass to C++ a pointer to a (Python) function. Will this work? Thanks, Jeremy

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VisualStudio2005 supported in distutils
by mg Aug. 2, 2006

Aug. 2, 2006

Hello, I try to compile Python and several packages (like Numarray) with Visual Studio 2005. I downloaded the last version of Python from Subversion, and project files are provided for Visual Studio 2005. With some few simple corrections, everything compile and Python run correctly. Unfortunately, distutils does not support VisualStudio2005. I tried to modify the file msvccompiler.py without success (this case requires to support some changes of the Visual Studio 8 register for both Win32 and Win64). So, I wonder if the integration of VisualStudio2005 in distutils is scheduled in the Python developments or better, if someone has experiences or patch to support VisualStudio2005 in distutils. Thanks, Mathieu.

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