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• Packaging python software with custom dependencies

  - by viraptor

  Hi, I'm looking for a good way to package a Python application that is going to be deployed on a Debian server. The application itself depends on some modules which are not included in base Debian repository, although they might be in the future. This creates some problems... I depend on some patches to those modules. If the original module gets installed one day, the application will break. However if I install everything I need in a virtualenv just for that application, I lose the ability to upgrade Python itself (in case of security updates). The third option would be to rename my fork of the upstream module and just treat it as a completely separate one. But that would mean changing the code (not much work, but it wouldn't be that clean / universal anymore). Are there any other options that I missed? Are there any pros / cons I didn't see in the solutions above?

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• what are python libraries to work with git without installing git

  - by Arash

  I want to develop an application using python. It should be able to work with git repositories (show diffs, ...) I need a python library to work with .git repositories (creating, cloning, commit, ...) without installing git on my system. It would be nice if you give your own idea about each library you suggest. Information about how its documentation is? how bug free it is? and if it has an active development? is appreciated. Thanks in advance

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• Getting .py scripts to open up in Python's IDLE

  - by Jahkr

  Hi there, I'm new to Python. I use Python 2.7 and I am running Windows Vista (64-bit). How do I make it when I click on .py scripts... that it opens up in IDLE so I can edit it a snap? Ya know... without having to open IDLE by itself. Heh. I got all the way to C:\Python27\Lib\idlelib but I don't see the IDLE application. Then when I do right-click and "Default open with" and select the idle.bat file.. I get this: Thanks!

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• Close - python.

  - by Jahkr

  Hi there, I'm new to Python. I use Python 2.7 and I am running Windows Vista (64-bit). How do I make it when I click on .py scripts... that it opens up in IDLE so I can edit it a snap? Ya know... without having to open IDLE by itself. Heh. I got all the way to C:\Python27\Lib\idlelib but I don't see the IDLE application. Then when I do right-click and "Default open with" and select the idle.bat file.. I get this: Thanks!

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• Python and mod_wsgi path issue

  - by jasonh

  I have an AIX 6.1 system that I've compiled and installed: Apache 2.2.21 (into /usr/local/mercurial) Python 2.7.2 (into /usr/local/bin and /usr/local/lib) mod_wsgi 3.3 (with the AIX fix #1 described here) Mercurial 2.0 (system-wide) However, when Apache starts, I get the following message in error_log: IOError: invalid Python installation: unable to open /usr/local/bin/lib/python2.7/config/Makefile (No such file or directory) See the problem? bin/lib doesn't exist. /usr/local/lib/python2.7/config/Makefile does exist though. However, I can't figure out where it's getting that path from. Here's the environment variables I've got: PYTHONHOME=/usr/local/bin PYTHONPATH=/usr/local/lib/python2.7 LIBPATH="/usr/local/mercurial/lib:$LIBPATH" PATH=/usr/local/bin:/usr/local/lib:$PATH LDR_CNTRL="MAXDATA=0x80000000" AIXTHREAD_SCOPE=S AIXTHREAD_MUTEX_DEBUG=OFF AIXTHREAD_RWLOCK_DEBUG=OFF AIXTHREAD_COND_DEBUG=OFF SPINLOOPTIME=1000 YIELDLOOPTIME=8 MALLOCMULTIHEAP=considersize,heaps:8 I've tried all sorts of combinations with and without PYTHONHOME, PYTHONLIB and PATH in envvars. My PATH, in case it matters is: /usr/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/sbin:/usr/opt/ifor/bin:/usr/local/bin:.

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• VIM "upgraded" to expandtab and tabstop=8 on Python files

  - by dotancohen

  After reinstalling my OS from Kubuntu 12.10 to Kubuntu 14.04, VIM has changed its behaviour when editing Python files. Though before the reinstall all file types had noexpandtab and tabstop=4 set, now in Python those values are expandtab and tabstop=8, checked also via VIM behaviour and also via asking VIM set foo?. Non-Python files retain the noexpandtab and tabstop=4 behaviour that I prefer. The .vim direcotry and .vimrc were not touched during the reinstall. It can be seen that no files in .vimrc have been touched in months (with the exception of the irrelevant .netrwhist): - bruno():~$ ls -lat ~/.vim total 68 drwxr-xr-x 85 dotancohen dotancohen 12288 Aug 25 13:00 .. drwxr-xr-x 12 dotancohen dotancohen 4096 Aug 21 11:11 . -rw-r--r-- 1 dotancohen dotancohen 268 Aug 21 11:11 .netrwhist drwxr-xr-x 2 dotancohen dotancohen 4096 Mar 6 18:31 plugin drwxr-xr-x 2 dotancohen dotancohen 4096 Mar 6 18:31 doc drwxrwxr-x 2 dotancohen dotancohen 4096 Nov 29 2013 syntax drwxrwxr-x 2 dotancohen dotancohen 4096 Nov 29 2013 ftplugin drwxr-xr-x 4 dotancohen dotancohen 4096 Nov 29 2013 autoload drwxrwxr-x 5 dotancohen dotancohen 4096 May 27 2013 after drwxr-xr-x 2 dotancohen dotancohen 4096 Nov 1 2012 spell -rw------- 1 dotancohen dotancohen 138 Aug 14 2012 .directory -rw-rw-r-- 1 dotancohen dotancohen 190 Jul 3 2012 .VimballRecord drwxrwxr-x 2 dotancohen dotancohen 4096 May 12 2012 colors drwxrwxr-x 2 dotancohen dotancohen 4096 Mar 16 2012 mytags drwxrwxr-x 2 dotancohen dotancohen 4096 Feb 14 2012 keymap Though .vimrc has been touched since the reinstall, it was only me testing to see where the problem is. How can I tell what is settingexpandtab and tabstop? Side note: I'm not even sure what I should read in the built-in help for this issue. I started with ":h plugin" but that did not help other than showing me that the following plugins are loaded (possibly relevant): standard-plugin-list Standard plugins pi_getscript.txt Downloading latest version of Vim scripts pi_gzip.txt Reading and writing compressed files pi_netrw.txt Reading and writing files over a network pi_paren.txt Highlight matching parens pi_tar.txt Tar file explorer pi_vimball.txt Create a self-installing Vim script pi_zip.txt Zip archive explorer LOCAL ADDITIONS: local-additions DynamicSigns.txt - Using Signs for different things NrrwRgn.txt A Narrow Region Plugin (similar to Emacs) fugitive.txt A Git wrapper so awesome, it should be illegal indent-object.txt Text objects based on indent levels. taglist.txt Plugin for browsing source code vimwiki.txt A Personal Wiki for Vim

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• Install & execute python on cPanel/whm

  - by Daniel

  Hi, How would i enable and execute python scripts on cPanel/WHM accounts?

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• Visual Studio 2010 Graphic Artifacts

  - by jonathan

  This problem started happening to me once I installed SP1 onto my Windows 7 Ultimate install. When changing between tabs, or even just hovering my mouse over buttons, VS2010 starts artifacting. It's bad enough where I often times can't see any of the code I'm working on. Sometimes just the button the mouse is over will go black, and other times the entire code panel will turn a black and grey pattern. This problem only happens with Visual Studio 2010 (2008 works fine). The problem remained when I upgraded Visual Studio to SP1. I've also uninstalled and reinstalled Visual Studio and the graphics drivers several times now, and I'm about ready to reinstall Windows 7, but I figured I'd ask for suggestions first. Google, as well as searching through Stack Exchange, did not turn up anything useful.

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• Mac OS X: Change $PATH from within python script

  - by Eye of Hell

  I have a bunch of python scripts. One of them installs software (subversion) that requires it's path to be added to $PATH. After it is installed, I want the next script to use the software. If I run export PATH=/opt/subversion/bin:$PATH in bash between the first and second script, all is ok. But if I add os.system( 'export PATH=/opt/subversion/bin:$PATH' ) as the last command of the first script (that installs subversion), $PATH remains unaltered after it exits. Is it any way to change $PATH from within python script so it will remain changed after the script finishes (inside single bash session, of course, I know about /etc/profile).

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• Python: how to calculate data received and send between two ipaddresses and ports [closed]

  - by ramdaz

  I guess it's socket programming. But I have never done socket programming expect for running the tutorial examples while learning Python. I need some more ideas to implement this. What I specifically need is to run a monitoring program of a server which will poll or listen to traffic being exchange from different IPs across different popular ports. For example, how do I get data received and sent through port 80 of 192.168.1.10 and 192.168.1.1 ( which is the gateway). I checked out a number of ready made tools like MRTG, Bwmon, Ntop etc but since we are looking at doing some specific pattern studies, we need to do data capturing within the program. Idea is to monitor some popular ports and do a study of network traffic across some periods and compare them with some other data. We would like to figure a way to do all this with Python....

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• How to install Python 2.7 w/ unix libs on cygwin

  - by JIStone

  I have been trying for about a week to get this to work. Obviously getting Python 2.6 is easy - just install the cygwin package with setup.exe. Installing the windows version of Python2.7 was also easy, but I could not access the Unix Modules. So I've been trying to install Python from source, but it seems every time I fix one make error there is another waiting just behind it. Getting rather fed up with the whole thing & thinking someone else must have either done this or figured out it is impossible. I feel installing Linux would have been the easier route . . .

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• How To Add Python to the Windows Path

  - by davewise

  How do I add python to the windows PATH permanently?

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• how to solve unhandled exception error when using visual C++ 2008?

  - by make

  Hi, Could someone please help me to solve unhandled exception error when using visual C++ 2008? the error is displayed as follow: Unhandled exception at 0x00411690 in time.exe: 0xC0000005: Access violation reading location 0x00000008 Actually when I used visual c++ 6 in the past, there weren't any error and the program was running fine. But now ehen I use visual 2008, I am getting this Unhandled exception error. Here is the program: #include <stdio.h> #include <stdlib.h> #include <time.h> #ifdef _WIN32 // #include <winsock.h> #include <windows.h> #include "stdint.h" // typedef __int64 int64_t // Define it from MSVC's internal type // typedef unsigned __int32 uint32_t #else #include <stdint.h> // Use the C99 official header #include <sys/time.h> #include <unistd.h> #endif #if defined(_MSC_VER) || defined(_MSC_EXTENSIONS) #define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64 #else #define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL #endif struct timezone { int tz_minuteswest; /* minutes W of Greenwich */ int tz_dsttime; /* type of dst correction */ }; #define TEST #ifdef TEST uint32_t stampstart(); uint32_t stampstop(uint32_t start); int main() { uint32_t start, stop; start = stampstart(); /* Your code goes here */ stop = stampstop(start); return 0; } #endif int gettimeofday(struct timeval *tv, struct timezone *tz) { FILETIME ft; unsigned __int64 tmpres = 0; static int tzflag = 0; if (NULL != tv) { GetSystemTimeAsFileTime(&ft); tmpres |= ft.dwHighDateTime; tmpres <<= 32; tmpres |= ft.dwLowDateTime; tmpres /= 10; /*convert into microseconds*/ /*converting file time to unix epoch*/ tmpres -= DELTA_EPOCH_IN_MICROSECS; tv->tv_sec = (long)(tmpres / 1000000UL); tv->tv_usec = (long)(tmpres % 1000000UL); } if (NULL != tz) { if (!tzflag) { _tzset(); tzflag++; } tz->tz_minuteswest = _timezone / 60; tz->tz_dsttime = _daylight; } return 0; } uint32_t stampstart() { struct timeval tv; struct timezone tz; struct tm *tm; uint32_t start; gettimeofday(&tv, &tz); tm = localtime(&tv.tv_sec); printf("TIMESTAMP-START\t %d:%02d:%02d:%d (~%d ms)\n", tm->tm_hour, tm->tm_min, tm->tm_sec, tv.tv_usec, tm->tm_hour * 3600 * 1000 + tm->tm_min * 60 * 1000 + tm->tm_sec * 1000 + tv.tv_usec / 1000); start = tm->tm_hour * 3600 * 1000 + tm->tm_min * 60 * 1000 + tm->tm_sec * 1000 + tv.tv_usec / 1000; return (start); } uint32_t stampstop(uint32_t start) { struct timeval tv; struct timezone tz; struct tm *tm; uint32_t stop; gettimeofday(&tv, &tz); tm = localtime(&tv.tv_sec); stop = tm->tm_hour * 3600 * 1000 + tm->tm_min * 60 * 1000 + tm->tm_sec * 1000 + tv.tv_usec / 1000; printf("TIMESTAMP-END\t %d:%02d:%02d:%d (~%d ms) \n", tm->tm_hour, tm->tm_min, tm->tm_sec, tv.tv_usec, tm->tm_hour * 3600 * 1000 + tm->tm_min * 60 * 1000 + tm->tm_sec * 1000 + tv.tv_usec / 1000); printf("ELAPSED\t %d ms\n", stop - start); return (stop); } thanks for your replies:

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• Microsoft Channel 9 Interviews Mei Liang to Introduce Sample Browser Extension for Visual Studio 2012 and 2010

  - by Jialiang

  This morning, Microsoft Channel 9 interviewed Mei Liang - Group Manager of Microsoft All-In-One Code Framework - to introduce the newest Sample Browser extension for Visual Studio 2012 &2010.   This extension provides a way for developers to search and download more than 4500 code samples from within Visual Studio, including over 700 Windows 8 samples and more than 1000 All-In-One Code Framework customer-driven code samples. Mei shows us not only the extension, but also the standalone version of the Sample Browser.   http://channel9.msdn.com/Shows/Visual-Studio-Toolbox/Sample-Browser-Visual-Studio-Extension   Microsoft All-In-One Code Framework, working in close partnership with the Visual Studio product team and MSDN Samples Gallery, developed the Sample Browser extension for both Visual Studio 2012 and Visual Studio 2010.  As an effort to evolve the code sample use experience and improve developers' productivity, the Sample Browser allows programmers to search, download and open over 4500 code samples from within Visual Studio with just a few simple clicks.  If no existing code sample can meet the needs, developers can even request a code sample easily from Microsoft thanks to the free “Sample Request Service” offered by Microsoft All-In-One Code Framework.  Through innovations, the teams hope to put the power of tens of thousands of code samples at developers’ fingertips. In short 3 months, the Sample Browser Visual Studio Extension has been installed by 100K global users.  It is also selected as one of the six most highly regarded and commonly used tools for Visual Studio that will make your programming experience feel like never before.   Got to love the All-In-One Code Framework team! You guys know this is THE go to source for code samples. Get this extension and you'll never need to leave VS2012 (well except for bathroom trips, but that's TMI anyway... ;) Read More... From: Greg Duncan (Author of CoolThingOfTheDay) 9/6/2011 12:00 AM The one software design pattern that I have used in just about every application I’ve written is “cut-and-paste,” so the new “Sample Browser” – read sample as a noun not an adjective – is a great boon to my productivity. Read More... From: Jim O'Neil (Microsoft Developer Evangelist) 9/28/2011 12:00 AM Install: http://aka.ms/samplebrowservsx Microsoft All-In-One Code Framework also offers the standalone version of Sample Browser.   The standalone version is particularly useful to Visual Studio Express edition or Visual Studio 2008 users, who cannot install the Sample Browser Visual Studio extension.   From Grassroots’ Passion for Developers to the Innovation of Sample Browser This Sample Browser has come a very long way improving the code sample use experience.  The history can be traced back to a grass-root innovation three years ago.   In early 2009, a few MSDN forum support engineers observed that lots of developers were struggling to work in Visual Studio without adequate code samples. Programming tasks seem harder than they should be when you only read through the documentation.  Just a couple of lines of sample code could answer a lot of questions.   They had a brilliant idea: What if we produce code samples based on developers’ frequently asked programming tasks in forums, social networks and support incidents, and then aggregate all our sample code in a one-stop library to benefit developers?  And what if developers can request code samples directly from Microsoft, free of charge?  This small group of grassroots at Microsoft devoted their nights and weekends to prototyping such a customer-driven code sample library.  This simple idea eventually turned into “Microsoft All-In-One Code Framework”, aka. OneCode.  With the support from more and more passionate developers at Microsoft and the leaders in the Community and Online Support team and Microsoft Commercial Technical Services (CTS), the idea has become a continually growing library with over 1000 customer-driven code samples covering almost all Microsoft development technologies.  These code samples originated from developers’ common pains and needs should be able to help many developers.  However, if developers cannot easily discover the code samples, the effort would still be in vain.  So in early 2010, the team started the idea of Sample Browser to ease the discovery and access of these samples.  In just two months, the first version of Sample Browser was finished and released by a passionate developer.  It was a very simple application, only supporting the basic sample offline search.  Users had to download the whole 100MB sample package containing all samples first, and run the Sample Browser to search locally.   Though developers could not search and download samples on-demand, this simple application laid a solid foundation for the team’s continuous innovations of Sample Browsing experience. In 2011, MSDN Samples Gallery had a big refresh.  The online sample experience was brought to a new level thanks to its PM Steven Wilssens and the gallery team’s effort.  Microsoft All-In-One Code Framework Team saw the opportunity to realize the “on-demand” sample search and download feature with the new gallery.  The two teams formed a strong partnership to upload all the customer-driven code samples to MSDN Samples Gallery, and released the new version of Sample Browser to support “on-demand” sample downloading in April, 2011.  Mei Liang, the Group Manager of Microsoft All-In-One Code Framework, was interviewed by Channel 9 to demo the Sample Browser.  Customers love the effort and the innovation!!  This can be clearly seen from the user comments in the publishing page.   It was very encouraging to the team of All-In-One Code Framework. The team continues innovating and evolving the Sample Browser.  They found the Visual Studio product team this time, and integrated the Sample Browsing experience into the latest Visual Studio 2012.  The newly released Sample Browser Visual Studio extension makes good use of Visual Studio 2012 IDE such as the new Quick Launch bar, the code editor, the toolbar and menus to offer easy access to thousands of code samples from within the development environment.   The Visual Studio Senior Program Manager Lead - Anthony Cangialosi, the Program Manager - Murali Krishna Hosabettu Kamalesha, the MSDN Samples Gallery PM – Steven Wilssens, and the Visual Studio Senior Escalation Engineer - Ed Dore shared lots of insightful suggestions with the team.  Thanks to the brilliant cross-group collaboration inside Microsoft, tens of new features including “Local Language Support” and “Favorite Samples”, as well as a face-lifted user interface, were added to further enhance the user experience. Since the new Sample Browser Visual Studio extension was released, it has received over 100 thousand downloads and five-star ratings.  A customer told the team that he officially falls in LOVE with Microsoft All-In-One Code Framework.   The Sample Browser Innovation for Developers Never Stops! The teams would never stop improving the Sample Browser for developers’ easier lives.   The Microsoft All-In-One Code Framework, Visual Studio and MSDN Samples Gallery teams are working closely to develop the next version of Sample Browser.  Here are the key functions in development or in discussion.  We hope to learn your feedback of the effort.  You can submit your suggestions to the official Visual Studio UserVoice site.  We look forward to hearing from you! 1) Offline Sample Search This is one of the top feature requests that we have received for Sample Browser.   The Sample Browser will support the offline search mode so that developers can search downloaded code samples when they do not have internet access.  This is particularly useful to developers in Enterprises with strict proxy settings. 2) Code Snippet Support and Visual Studio Editor Integration Today, the Sample Browser supports downloading and opening sample project.   However, when developers are searching for code samples, a better user experience would be to see the code snippets in the search result first.  Developers can quickly decide if the code snippet is relevant.   They can also drag and drop the code snippet into the Visual Studio Editor to solve some simple programming tasks.  If developers want to learn more about the sample, they can then choose to download the sample project and open it in Visual Studio. 3) Enterprise Sample Sharing and Searching Large enterprises have many code samples for their own internal tools and APIs that are not appropriate to be shared publicly in MSDN Samples Gallery.   In that case, today’s Sample Browser and MSDN Samples Gallery cannot help these Enterprise developers.  The idea is to create a Code Sample Repository in TFS, and provide an additional Visual Studio extension for Enterprise developers to quickly share code samples to TFS.  The Sample Browser can be configured to connect to the TFS Code Sample Repository to search for and download code samples.  This would potentially enable the Enterprise developers to be more productive. 4) Windows Store Sample Browser With the upcoming release of Windows RT and Microsoft Surface, developers are facing a completely new world of application platform.   Not like laptop, people would often use Microsoft Surface in commute and in travel.  Internet may not be available.  Today’s Visual Studio cannot be installed and run on Windows RT, however, our enthusiastic developers would hope to spend every minute on code.  They love code!   The idea is to create a Windows Store version of Sample Browser. Search and download samples from the online Samples Gallery when the user has internet access. Browse the sample code files and learn the sample documentation of downloaded samples with or without internet access.   In addition to the "browse” function, the Sample Browser could further support “bookmark”, “learning notes”, “code review”, and “quick social sharing". Make full use of the new touch and Windows Store App UI to give developers a new “relaxing” code browsing and learning experience, anytime, anywhere. With Windows Store Sample Browser, developers can enjoy A new relaxing and enjoyable experience for developers to learn code samples You do not have to sit in front of desk and formally open Visual Studio to read code samples.  Many developers get sub-health due to staying in front of desk for a very long time.  With Windows RT, Microsoft Surface and this Windows Store Sample Browser combining with the online MSDN Samples Gallery, developers can sit in a sofa, relaxingly hold the tablet and enjoy to learn their beloved sample code with detailed documentation. Anytime, anywhere Whether you have internet access or not, whether you are at home, in office, or in commute/airplane, developers can always easily access and browse the sample code. Lightweight and fast Particularly for learning a small sample project, the Windows Store Sample Browser would be more lightweight and faster to open and browse the sample code. Please submit your feedback and suggestion to Visual Studio UserVoice.  We look forward to hearing from you and deliver a better and better sample use experience.  Happy Coding!   Special Thanks to People working behind the latest release of Sample Browser Visual Studio Extension and the great partnerships!

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• Trying to move away from PHP/Yii: RoR, Python/Django or ASP.NET MVC? Your opinions please [closed]

  - by Örs

  I have a CS degree and I've been working as a web developer (front & backend) for about 2 years now. I've been working with PHP mostly because it was easy to pick up and find a job, but I've grown to dislike the language and want to try something new, and possibly get a better paying job. That last point is especially important because in my area (Romania/Eastern Europe) PHP jobs are mostly for people fresh out of college/high school, hence the pay is rather low. I've been working with the Yii framework which, if I understand correctly, borrows a lot from Ruby on Rails (convention over configuration, MVC, Active Record, scaffolding). Other than PHP I only know curly-brace languages (C/C++/Java) and bash so Python/Ruby might be a bit challenging. On the other hand I've been using Linux (with vim and recently Sublime Text 2) for almost 4 years now so Windows and a lack of a terminal would have its downsides as well. I'm leaning towards Python/Ruby because of my *nix bias (plus both look like fun), but I've heard great things about ASP.NET MVC as well. Any suggestions? PS: I think there are more jobs in ASP.NET around here, but that's not necessarily a plus, because there are a lot of CS graduates as well. tl;dr: Romanian PHP/Yii developer trying to move to Python/Django or Ruby/Rails or C#/ASP.NET MVC. Suggestions?

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• How to build 64-bit Python on OS X 10.6 -- ONLY 64 bit, no Universal nonsense

  - by ssteiner

  I just want to build this on my development machine -- the binary install from Python.org is still 32 bits and installing extensions (MySQLdb, for example) is driving me nuts with trying to figure out the proper flags for each and every extension. Clarification: I did NOT replace the system Python, I just installed the Python.org binary into its normal place at /Library/..., not /System/Library/.... Everything else seems to build 64 bit by default, and the default Python 2.6.1 was 64 bit (before I replaced it with the Python.org build figuring it was a direct replacement)` I just want a 64 bit only build that will run on my one machine without any cruft. Does anyone have a simple answer? Thanks much, [email protected]

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• Python 2.7 - Help using an API (HL7)

  - by atomicluis

  I am new to programming and Python. I have a very basic python script that connects to server and send a text message: #!/usr/bin/python import socket s = socket.socket() host = '127.0.0.1' port = 4106 s.connect((host, port)) message = 'test1' s.send(message) print s.recv(1024) s.close Everything is fine, except that this message is an HL7 message and needs to wrapped in MLLP I found this API that I think can do this for me (http://python-hl7.readthedocs.org/en/latest/api.html#mllp-network-client) So I modified my program to the following, but I keep getting the error message: NameError: name 'MLLPClient' is not defined #!/usr/bin/python import socket import hl7 host = '127.0.0.1' port = 4106 with MLLPClient(host, port) as client: client.send_message('test1') print s.recv(1024) s.close Thanks in advanced for all the help

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• Why is IoC / DI not common in Python?

  - by tux21b

  In Java IoC / DI is a very common practice which is extensively used in web applications, nearly all available frameworks and Java EE. On the other hand, there are also lots of big Python web applications, but beside of Zope (which I've heard should be really horrible to code) IoC doesn't seem to be very common in the Python world. (Please name some examples if you think that I'm wrong). There are of course several clones of popular Java IoC frameworks available for Python, springpython for example. But none of them seems to get used practically. At least, I've never stumpled upon a Django or sqlalchemy+<insert your favorite wsgi toolkit here> based web application which uses something like that. In my opinion IoC has reasonable advantages and would make it easy to replace the django-default-user-model for example, but extensive usage of interface classes and IoC in Python looks a bit odd and not »pythonic«. But maybe someone has a better explanation, why IoC isn't widely used in Python.

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• Boost.python building

  - by Ockonal

  Hi guys, really can't understand, how to build correctly project that uses boost.python. I've included boost_(python/thread/system)-mt. Here is simple module file: #include <boost/python.hpp> #include "script.hpp" #include "boost/python/detail/wrap_python.hpp" BOOST_PYTHON_MODULE(temp) { namespace py = boost::python; py::def("PyLog", &engine::log); } Here is bulid log: http://dpaste.com/179232/. Can't imagine what I forgot. System: arch linux; ls /usr/lib |grep boost : http://dpaste.com/179233/

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• Easiest way of unit testing C code with Python

  - by Jon Mills

  I've got a pile of C code that I'd like to unit test using Python's unittest library (in Windows), but I'm trying to work out the best way of interfacing the C code so that Python can execute it (and get the results back). Does anybody have any experience in the easiest way to do it? Some ideas include: Wrapping the code as a Python C extension using the Python API Wrap the C code using SWIG Add a DLL wrapper to the C code and load it into Python using ctypes Add a small XML-RPC server to the c-code and call it using xmlrpclib (yes, I know this seems a bit far-out!) Is there a canonical way of doing this? I'm going to be doing this quite a lot, with different C modules, so I'd like to find a way which is least effort.

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• Serializing Python bytestrings to JSON, preserving ordinal character values

  - by Doctor J

  I have some binary data produced as base-256 bytestrings in Python (2.x). I need to read these into JavaScript, preserving the ordinal value of each byte (char) in the string. If you'll allow me to mix languages, I want to encode a string s in Python such that ord(s[i]) == s.charCodeAt(i) after I've read it back into JavaScript. The cleanest way to do this seems to be to serialize my Python strings to JSON. However, json.dump doesn't like my bytestrings, despite fiddling with the ensure_ascii and encoding parameters. Is there a way to encode bytestrings to Unicode strings that preserves ordinal character values? Otherwise I think I need to encode the characters above the ASCII range into JSON-style \u1234 escapes; but a codec like this does not seem to be among Python's codecs. Is there an easy way to serialize Python bytestrings to JSON, preserving char values, or do I need to write my own encoder?

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• Compiling python modules whith DEBUG defined on MSVC

  - by DaedalusFall

  Python rather stupidly has a pragma directive in its include files that forces a link against python26_d.lib when the DEBUG preprocessor variable is defined. This is a problem because the python installer doesn't come with python26_d.lib! So I can't build applications in msvc in debug mode. If i temporarily #undef DEBUG for just one file I get many complaints about inconsistent DLL linkage. If I change the pragma in pythons include file I get undefined references to various debug functions. I have tried compiling my own version of python but its somehow different enough from the python that gets distributed that I can't use my modules with apps built with the vanilla version of python Can anyone give me any advice on how to get round this? Thanks

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• Empty list in appengine datastore: java vs python

  - by lOranger

  I have the following java model class in AppEngine: public class Xyz ... { @Persistent private Set<Long> uvw; } When saving an object Xyz with an empty set uvw in Java, I get a "null" field (as listed in the appengine datastore viewer). When I try to load the same object in python (through remote_api), as defined by the following python model class: class Xys(db.Model): uvw = db.ListProperty(int) I get a "BadValueError: Property uvw is required". When saving another object of the same class in python with an empty uvw list, the datastore viewer print a "missing" field. Apparently empty lists storage handling differs between Java and python and lead to "incompatible" objects. Thus my question: Is there a way to, either: force Java to store an empty list as a "missing" field, force Python to gracefully accept a "null" list as an empty list when loading the object? Or any other suggestion on how to handle empty list field in both languages. Thanks for your answers!

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• TeamCity for continuous integration with Visual Studio 2010 solutions/projects

  - by JeffryEngberg

  I am running TeamCity build 5.1.1 on a virtual machine that also hosts our SVN environment. A team I support has recently made the move from Visual Studio 2008/Silverlight 3.0 to Visual Studio 2010/Silverlight 4.0 and when investigating how to do continuous integration with Visual Studio 2010 solutions/projects, it is not as cut and dried as it appeared to be in Visual Studio 2008. Previously I was using Web Deployment Projects and targeting different Release Configurations in TeamCity, which would use the Web Deployment Project to package/deploy the code to our various environments. However when checking out the new Publish ability in Visual Studio 2010 I cannot find a way to specify which location to deploy to. Does everything need to be done in MSBuild now (in the solution file or maybe the Web project file?). If anyone has any examples of how they've done Continuous Integration using TeamCity and Visual Studio 2010, it would be greatly appreciated as I am coming up blank at the moment.

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• Rationale behind Python's preferred for syntax

  - by susmits

  What is the rationale behind the advocated use of the for i in xrange(...)-style looping constructs in Python? For simple integer looping, the difference in overheads is substantial. I conducted a simple test using two pieces of code: File idiomatic.py: #!/usr/bin/env python M = 10000 N = 10000 if __name__ == "__main__": x, y = 0, 0 for x in xrange(N): for y in xrange(M): pass File cstyle.py: #!/usr/bin/env python M = 10000 N = 10000 if __name__ == "__main__": x, y = 0, 0 while x < N: while y < M: y += 1 x += 1 Profiling results were as follows: bash-3.1$ time python cstyle.py real 0m0.109s user 0m0.015s sys 0m0.000s bash-3.1$ time python idiomatic.py real 0m4.492s user 0m0.000s sys 0m0.031s I can understand why the Pythonic version is slower -- I imagine it has a lot to do with calling xrange N times, perhaps this could be eliminated if there was a way to rewind a generator. However, with this deal of difference in execution time, why would one prefer to use the Pythonic version?

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