🌐 Mailman 3 June 2009 - Python-list - python.org

Missing codecs in Python 3.0
by samwyse June 3, 2009

June 3, 2009

I have a Python 2.6 program (a code generator, actually) that tries several methods of compressing a string and chooses the most compact. It then writes out something like this: { encoding='bz2_codec', data = '...'} I'm having two problems converting this to Py3. First is the absence of the bz2_codec, among others. It was very convenient for my program to delay selection of the decoding method until run-time and then have an easy way to load the appropriate code. Is this gone forever from the standard libraries? Second, I would write my data out using the 'string_escape' codec. It, too, has been removed; there's a 'unicode_escape' codec which is similar, but I would rather use a 'byte_escape' codec to produce literals of the form b'asdf'. Unfortunately, there isn't one that I can find. I could use the repr function, but that seems less efficient. Does anyone have any ideas? Thanks.

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Spring Python 1.0.0-RC2 has been released
by Goldfish June 3, 2009

June 3, 2009

Spring Python takes the concepts implemented by the Java-based Spring Framework, and applies them to Python. This provides a powerful library of functionality to help you get back to writing the code that makes you money. It includes features like data access, transaction management, remoting, security, a command-line tool, and an IoC container. Today, release 1.0.0 (RC2) has been released. See http://blog.springpython.webfactional.com/2009/06/03/spring-python-100-rc2-… for more details about this release, including release notes, links, and other information.

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Project source code layout?
by Allen Fowler June 3, 2009

June 3, 2009

Hello, I'm new to Python, and am looking for some suggestions as to the source code layout for a new project. The project will be a tg/pylons daemon, a static website, and a collection of other scripts that will interact with the app and DB. Here is what I am thinking so far: root_folder/ - app/ -- Code for pylons/TG web app - web/ -- Public static web files (and wsgi / fastCGI connector files) - db/ -- SQlite DB - scripts/ -- Various custom programs that will also interact with the DB / app. (Some cron, some interactive.) - config/ -- 3-rd party API tokens, DB parameters, etc. However, I am still wondering about a few items: 1) Where to create the virtualpython installation that will be used by both the app and the scripts. 2) Where to put our in-house created python modules so that they can be imported by both the TG app and our own scripts. 3) How to cleanly provide the various config settings to both the web app and scripts. Any suggestions? ideas? fwiw, I am planing on keeping the whole thing in a Mercurial repository. Thank you, Allen :)

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private pypi repository
by Aljosa Mohorovic June 3, 2009

June 3, 2009

i'm looking for a effective way to setup private pypi repository, i've found: - PloneSoftwareCenter - http://code.google.com/p/pypione/ - http://pypi.python.org/pypi/haufe.eggserver what are you using? what would you recommend? Aljosa Mohorovic

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Re: easiest way to plot x,y graphically during run-time?
by Diez B. Roggisch June 3, 2009

June 3, 2009

Esmail wrote: > Hi all, > > I am trying to visualize a number of small objects moving over > a 2D surface during run-time. I was wondering what would the easiest > way to accomplish this using Python? Ideally I am looking for a shallow > learning curve and efficient implementation :-) > > These objects may be graphically represented as dots, or preferably > as small arrow heads/pointy triangles moving about as their x,y > coordinates change during run-time. pygame certainly suited, but also Tk with it's canvas-object. Diez

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Re: easiest way to plot x,y graphically during run-time?
by Mensanator June 3, 2009

June 3, 2009

On Jun 3, 10:53 am, Esmail <ebo...(a)hotmail.com> wrote: > Hi all, > > I am trying to visualize a number of small objects moving over > a 2D surface during run-time. I was wondering what would the easiest > way to accomplish this using Python? Try Turtle Graphics using goto's. With pen up! :-) > Ideally I am looking for a shallow > learning curve and efficient implementation :-) > > These objects may be graphically represented as dots, or preferably > as small arrow heads/pointy triangles moving about as their x,y > coordinates change during run-time. > > Thanks, > Esmail

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is anyone using text to speech to read python documentation
by Eric_Dexter＠msn.com June 3, 2009

June 3, 2009

I wrote a small pre-processor for python documentation and I am looking for advice on how to get the most natural sounding reading. I uploaded an example of a reading of lxml documentation as a podcast1 http://dexrow.blogspot.com/2009/06/python-voice-preprocessor.html.

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Re: Using C++ and ctypes together: a vast conspiracy? ;)
by Diez B. Roggisch June 3, 2009

June 3, 2009

Joseph Garvin schrieb: > So I was curious whether it's possible to use the ctypes module with > C++ and if so how difficult it is. I figure in principal it's possible > if ctypes knows about each compiler's name mangling scheme. So I > searched for "ctypes c++" on Google. > > The third link will be "Using ctypes to Wrap C++ Libraries". If you > follow the link, it's broken. If you view the cache of the link, it's > someone pointing to another blog, retrograde-orbit.blogspot.com, > saying they discovered a way to do it easily. If you follow that link, > you get taken a page does not exist error. > > Clearly there's some way to use ctypes with C++ and there's a vast > conspiracy preventing it from reaching the masses ;) What's even > stranger is that this link, despite being broken, has seemingly been > near the top of google's results for these terms for a couple weeks > (that's when I last tried), as if there were some underground group of > rebels trying to hint the truth to us... ;) > > More seriously -- how difficult is it to use ctypes instead of saying, > boost::python, and why isn't this in a FAQ somewhere? ;) Because it's much more needed than name-mangling. Name mangling is (amongst other things) one thing to prevent C++-inter-compiler-interoperability which results from differing C++ ABIs. I'm not an expert on this, but AFAIK no common ABI exists, especially not amongst VC++ & G++. Which means that to work for C++, ctypes would need to know about the internals of both compilers, potentially in several versions, and possibly without prior notice to changes. Instead of dealing with this truly daunting task, tools such as SIP and SWIG or boost::python deal with this by utilizing the one tool that really knows about the ABI in use - the compiler itself. So while I'd loved to be proven wrong, I fear your curiosity won't be satisfied - or at least not in the positive sense you certainly envisioned. Diez

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How do I change the behavior of the 'python-docs' action in IDLE?
by samwyse June 3, 2009

June 3, 2009

In the Windows version of Python 2.5, pressing F1 brought up the python.chm file. I've just installed 2.6, and the same action opens http://www.python.org/doc/current/. I'd prefer the former behavior. I know how to change the key bindings in config-keys.def, but I think I want to change the action, not the key binding. Thanks.

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float("1,009.67") error
by Jianli Shen June 3, 2009

June 3, 2009

I want to converter a string 1,009.67 to float, I got: python ValueError: invalid literal for float() how do I handle this. 1,009.67 is generated by some other program. It could be 2,898.88 3,554,545.66 etc. Thanks,

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