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• Creating Python C module from Fortran sources on Ubuntu 10.04 LTS

  - by Botondus

  In a project I work on we use a Python C module compiled from Fortran with f2py. I've had no issues building it on Windows 7 32bit (using mingw32) and on the servers it's built on 32bit Linux. But I've recently installed Ubuntu 10.04 LTS 64bit on my laptop that I use for development, and when I build it I get a lot of warnings (even though I've apparently installed all gcc/fortran libraries/compilers), but it does finish the build. However when I try to use the built module in the application, most of it seems to run well but then it crashes with an error: * glibc detected /home/botondus/Envs/gasit/bin/python: free(): invalid next size (fast): 0x0000000006a44760 ** Warnings on running *f2py -c -m module_name ./fortran/source.f90* customize UnixCCompiler customize UnixCCompiler using build_ext customize GnuFCompiler Could not locate executable g77 Found executable /usr/bin/f77 gnu: no Fortran 90 compiler found gnu: no Fortran 90 compiler found customize IntelFCompiler Could not locate executable ifort Could not locate executable ifc customize LaheyFCompiler Could not locate executable lf95 customize PGroupFCompiler Could not locate executable pgf90 Could not locate executable pgf77 customize AbsoftFCompiler Could not locate executable f90 absoft: no Fortran 90 compiler found absoft: no Fortran 90 compiler found absoft: no Fortran 90 compiler found absoft: no Fortran 90 compiler found absoft: no Fortran 90 compiler found absoft: no Fortran 90 compiler found customize NAGFCompiler Found executable /usr/bin/f95 customize VastFCompiler customize GnuFCompiler gnu: no Fortran 90 compiler found gnu: no Fortran 90 compiler found customize CompaqFCompiler Could not locate executable fort customize IntelItaniumFCompiler Could not locate executable efort Could not locate executable efc customize IntelEM64TFCompiler customize Gnu95FCompiler Found executable /usr/bin/gfortran customize Gnu95FCompiler customize Gnu95FCompiler using build_ext I have tried building a 32bit version by installing the gfortran multilib packages and running f2py with -m32 option (but with no success): f2py -c -m module_name ./fortran/source.f90 --f77flags="-m32" --f90flags="-m32" Any suggestions on what I could try to either build 32bit version or correctly build the 64bit version? Edit: It looks like it crashes right at the end of a subroutine. The 'write' executes fine... which is strange. write(6,*)'Eh=',Eh end subroutine calcolo_involucro The full backtrace is very long and I'm not sure if it's any help, but here it is: *** glibc detected *** /home/botondus/Envs/gasit/bin/python: free(): invalid next size (fast): 0x0000000007884690 *** ======= Backtrace: ========= /lib/libc.so.6(+0x775b6)[0x7fe24f8f05b6] /lib/libc.so.6(cfree+0x73)[0x7fe24f8f6e53] /usr/local/lib/python2.6/dist-packages/numpy/core/multiarray.so(+0x4183c)[0x7fe24a18183c] /home/botondus/Envs/gasit/bin/python[0x46a50d] /usr/local/lib/python2.6/dist-packages/numpy/core/multiarray.so(+0x4fbd8)[0x7fe24a18fbd8] /usr/local/lib/python2.6/dist-packages/numpy/core/multiarray.so(+0x5aded)[0x7fe24a19aded] /home/botondus/Envs/gasit/bin/python(PyEval_EvalFrameEx+0x516e)[0x4a7c5e] /home/botondus/Envs/gasit/bin/python(PyEval_EvalFrameEx+0x5a60)[0x4a8550] /home/botondus/Envs/gasit/bin/python(PyEval_EvalCodeEx+0x911)[0x4a9671] /home/botondus/Envs/gasit/bin/python[0x537620] /home/botondus/Envs/gasit/bin/python(PyObject_Call+0x47)[0x41f0c7] /home/botondus/Envs/gasit/bin/python[0x427dff] /home/botondus/Envs/gasit/bin/python(PyObject_Call+0x47)[0x41f0c7] /home/botondus/Envs/gasit/bin/python[0x477bff] /home/botondus/Envs/gasit/bin/python[0x46f47f] /home/botondus/Envs/gasit/bin/python(PyObject_Call+0x47)[0x41f0c7] /home/botondus/Envs/gasit/bin/python(PyEval_EvalFrameEx+0x4888)[0x4a7378] /home/botondus/Envs/gasit/bin/python(PyEval_EvalCodeEx+0x911)[0x4a9671] /home/botondus/Envs/gasit/bin/python(PyEval_EvalFrameEx+0x4d19)[0x4a7809] /home/botondus/Envs/gasit/bin/python(PyEval_EvalCodeEx+0x911)[0x4a9671] /home/botondus/Envs/gasit/bin/python(PyEval_EvalFrameEx+0x4d19)[0x4a7809] /home/botondus/Envs/gasit/bin/python(PyEval_EvalCodeEx+0x911)[0x4a9671] /home/botondus/Envs/gasit/bin/python[0x537620] /home/botondus/Envs/gasit/bin/python(PyObject_Call+0x47)[0x41f0c7] /home/botondus/Envs/gasit/bin/python(PyEval_CallObjectWithKeywords+0x43)[0x4a1b03] /usr/local/lib/python2.6/dist-packages/numpy/core/multiarray.so(+0x2ee94)[0x7fe24a16ee94] /home/botondus/Envs/gasit/bin/python(_PyObject_Str+0x61)[0x454a81] /home/botondus/Envs/gasit/bin/python(PyObject_Str+0xa)[0x454b3a] /home/botondus/Envs/gasit/bin/python[0x461ad3] /home/botondus/Envs/gasit/bin/python[0x46f3b3] /home/botondus/Envs/gasit/bin/python(PyObject_Call+0x47)[0x41f0c7] /home/botondus/Envs/gasit/bin/python(PyEval_EvalFrameEx+0x4888)[0x4a7378] /home/botondus/Envs/gasit/bin/python(PyEval_EvalCodeEx+0x911)[0x4a9671] /home/botondus/Envs/gasit/bin/python(PyEval_EvalFrameEx+0x4d19)[0x4a7809] /home/botondus/Envs/gasit/bin/python(PyEval_EvalFrameEx+0x5a60)[0x4a8550] ======= Memory map: ======== 00400000-0061c000 r-xp 00000000 08:05 399145 /home/botondus/Envs/gasit/bin/python 0081b000-0081c000 r--p 0021b000 08:05 399145 /home/botondus/Envs/gasit/bin/python 0081c000-0087e000 rw-p 0021c000 08:05 399145 /home/botondus/Envs/gasit/bin/python 0087e000-0088d000 rw-p 00000000 00:00 0 01877000-07a83000 rw-p 00000000 00:00 0 [heap] 7fe240000000-7fe240021000 rw-p 00000000 00:00 0 7fe240021000-7fe244000000 ---p 00000000 00:00 0 7fe247631000-7fe2476b1000 r-xp 00000000 08:03 140646 /usr/lib/libfreetype.so.6.3.22 7fe2476b1000-7fe2478b1000 ---p 00080000 08:03 140646 /usr/lib/libfreetype.so.6.3.22 7fe2478b1000-7fe2478b6000 r--p 00080000 08:03 140646 /usr/lib/libfreetype.so.6.3.22 7fe2478b6000-7fe2478b7000 rw-p 00085000 08:03 140646 /usr/lib/libfreetype.so.6.3.22 7fe2478b7000-7fe2478bb000 r-xp 00000000 08:03 263882 /usr/lib/python2.6/dist-packages/PIL/_imagingft.so 7fe2478bb000-7fe247aba000 ---p 00004000 08:03 263882 /usr/lib/python2.6/dist-packages/PIL/_imagingft.so 7fe247aba000-7fe247abb000 r--p 00003000 08:03 263882 /usr/lib/python2.6/dist-packages/PIL/_imagingft.so 7fe247abb000-7fe247abc000 rw-p 00004000 08:03 263882 /usr/lib/python2.6/dist-packages/PIL/_imagingft.so 7fe247abc000-7fe247abf000 r-xp 00000000 08:03 266773 /usr/lib/python2.6/lib-dynload/_bytesio.so 7fe247abf000-7fe247cbf000 ---p 00003000 08:03 266773 /usr/lib/python2.6/lib-dynload/_bytesio.so 7fe247cbf000-7fe247cc0000 r--p 00003000 08:03 266773 /usr/lib/python2.6/lib-dynload/_bytesio.so 7fe247cc0000-7fe247cc1000 rw-p 00004000 08:03 266773 /usr/lib/python2.6/lib-dynload/_bytesio.so 7fe247cc1000-7fe247cc5000 r-xp 00000000 08:03 266786 /usr/lib/python2.6/lib-dynload/_fileio.so 7fe247cc5000-7fe247ec4000 ---p 00004000 08:03 266786 /usr/lib/python2.6/lib-dynload/_fileio.so 7fe247ec4000-7fe247ec5000 r--p 00003000 08:03 266786 /usr/lib/python2.6/lib-dynload/_fileio.so 7fe247ec5000-7fe247ec6000 rw-p 00004000 08:03 266786 /usr/lib/python2.6/lib-dynload/_fileio.so 7fe247ec6000-7fe24800c000 r-xp 00000000 08:03 141358 /usr/lib/libxml2.so.2.7.6 7fe24800c000-7fe24820b000 ---p 00146000 08:03 141358 /usr/lib/libxml2.so.2.7.6 7fe24820b000-7fe248213000 r--p 00145000 08:03 141358 /usr/lib/libxml2.so.2.7.6 7fe248213000-7fe248215000 rw-p 0014d000 08:03 141358 /usr/lib/libxml2.so.2.7.6 7fe248215000-7fe248216000 rw-p 00000000 00:00 0 7fe248216000-7fe248229000 r-xp 00000000 08:03 140632 /usr/lib/libexslt.so.0.8.15 7fe248229000-7fe248428000 ---p 00013000 08:03 140632 /usr/lib/libexslt.so.0.8.15 7fe248428000-7fe248429000 r--p 00012000 08:03 140632 /usr/lib/libexslt.so.0.8.15 7fe248429000-7fe24842a000 rw-p 00013000 08:03 140632 /usr/lib/libexslt.so.0.8.15 7fe24842a000-7fe248464000 r-xp 00000000 08:03 141360 /usr/lib/libxslt.so.1.1.26 7fe248464000-7fe248663000 ---p 0003a000 08:03 141360 /usr/lib/libxslt.so.1.1.26 7fe248663000-7fe248664000 r--p 00039000 08:03 141360 /usr/lib/libxslt.so.1.1.26 7fe248664000-7fe248665000 rw-p 0003a000 08:03 141360 /usr/lib/libxslt.so.1.1.26 7fe248665000-7fe24876e000 r-xp 00000000 08:03 534240 /usr/local/lib/python2.6/dist-packages/lxml/etree.so 7fe24876e000-7fe24896d000 ---p 00109000 08:03 534240 /usr/local/lib/python2.6/dist-packages/lxml/etree.so 7fe24896d000-7fe24896e000 r--p 00108000 08:03 534240 /usr/local/lib/python2.6/dist-packages/lxml/etree.so 7fe24896e000-7fe248999000 rw-p 00109000 08:03 534240 /usr/local/lib/python2.6/dist-packages/lxml/etree.so 7fe248999000-7fe2489a7000 rw-p 00000000 00:00 0 7fe2489a7000-7fe2489bd000 r-xp 00000000 08:03 132934 /lib/libgcc_s.so.1

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• Rails ActionCaching with Memcached fragment hit but action gets called anyway

  - by baldtrol

  Hi stackoverflow. I'm running into something strange. I'm using memcached with a caches_action setup. I'm doing this in 4 different controllers. In two of them, it works flawlessly (so far), though admittedly those two controllers are less complicated than the two in which it doesn't seem to work. I'm doing something like this: caches_action :index, :expires_in => 6.hours, :cache_path => Proc.new {|controller| controller.send(:generate_cache_path) }, :layout => false, :if => Proc.new { |c| c.request.format.js? } The intention behind the above is to cache some results that are dependent on the params. my :generate_cache_path method just takes into account some params and session vars and creates a unique key for memcached. I can see in memcached -vv that this is working. What's weird is that I get my request from the rails app for a given key, and I see memcached (with -vv) get the request and send back the response. But then my action runs anyway, and a new value is then set for the same key, even when all the same params are given. I can watch it happen. In the controllers where everything is working, the request is made for the fragment, it gets it, and the action in the controller is halted, and the fragment is passed back. These lines come from the exact same request: Cached fragment hit: views/items/?page=1&rp=10&srtn=created_at&srto=DESC.js And then: Cached fragment miss: views/items/?page=1&rp=10&srtn=created_at&srto=DESC.js I don't know what to make of it, or if I'm doing something stupid. Any help or ideas where I could start looking for trouble would be greatly appreciated.

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• Python productivity VS Java Productivity

  - by toc777

  Over on SO I came across a question regarding which platform, Java or Python is best for developing on Google AppEngine. Many people were boasting of the increased productivity gained from using Python over Java. One thing I would say about the Python vs Java productivity argument, is Java has excellent IDE's to speed up development where as Python is really lacking in this area because of its dynamic nature. So even though I prefer to use Python as a language, I don't believe it gives quite the productivity boost compared to Java especially when using a new framework. Obviously if it were Java vs Python and the only editor you could use was VIM then Python would give you a huge productivity boost but when IDE's are brought into the equation its not as clear cut. I think Java's merits are often solely evaluated on a language level and often on out dated assumptions but Java has many benefits external to the language itself, e.g the JVM (often criticized but offers huge potential), excellent IDE's and tools, huge numbers of third party libraries, platforms etc.. Question, Does Python/related dynamic languages really give the huge productivity boosts often talked about? (with consideration given to using new frameworks and working with medium to large applications).

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• Python productivity VS Java Productivity

  - by toc777

  Over on SO I came across a question regarding which platform, Java or Python is best for developing on Google AppEngine. Many people were boasting of the increased productivity gained from using Python over Java. One thing I would say about the Python vs Java productivity argument, is Java has excellent IDE's to speed up development where as Python is really lacking in this area because of its dynamic nature. So even though I prefer to use Python as a language, I don't believe it gives quite the productivity boost compared to Java especially when using a new framework. Obviously if it were Java vs Python and the only editor you could use was VIM then Python would give you a huge productivity boost but when IDE's are brought into the equation its not as clear cut. I think Java's merits are often solely evaluated on a language level and often on out dated assumptions but Java has many benefits external to the language itself, e.g the JVM (often criticized but offers huge potential), excellent IDE's and tools, huge numbers of third party libraries, platforms etc.. Question, Does Python/related dynamic languages really give the huge productivity boosts often talked about? (with consideration given to using new frameworks and working with medium to large applications).

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• How to kill unkillable Python-processes running as root

  - by Andrei

  I am experiencing an annoying problem with sshuttle running it on 10.7.3, MBA with the latest firmware update -- after I stop it (ctrl+c twice), or loose connection, or close the lid, I cannot restore it until I restart the system. The restarting takes notably more time, than it would normally take. I have tried to flush ipfw rules - not helping. Could you advice me how to restore sshuttle connection (without restarting os)? The following processes remain running as root, which I do not know how to kill (tried sudo kill -9 <pid> with no luck): root 14464 python ./main.py python -v -v --firewall 12296 12296 root 14396 python ./main.py python -v -v --firewall 12297 12297 root 14306 python ./main.py python -v -v --firewall 12298 12298 root 3678 python ./main.py python -v -v --firewall 12299 12299 root 2263 python ./main.py python -v -v --firewall 12300 12300 The command I use to run proxy: ./sshuttle --dns -r [email protected] 10.0.0.0/8 -vv The last message I get trying to restore the connection: ... firewall manager: starting transproxy. s: Ready: 1 r=[4] w=[] x=[] s: < channel=0 cmd=PING len=7 s: > channel=0 cmd=PONG len=7 (fullness=554) s: mux wrote: 15/15 s: Waiting: 1 r=[4] w=[] x=[] (fullness=561/0) >> ipfw -q add 12300 check-state ip from any to any >> ipfw -q add 12300 skipto 12301 tcp from any to 127.0.0.0/8 >> ipfw -q add 12300 fwd 127.0.0.1,12300 tcp from any to 10.0.0.0/8 not ipttl 42 keep-state setup >> ipfw -q add 12300 divert 12300 udp from any to 10.0.1.1/32 53 not ipttl 42 >> ipfw -q add 12300 divert 12300 udp from any 12300 to any not ipttl 42 Update: $ ps -ax|grep python 1611 ?? 0:06.49 python ./main.py python -v -v --firewall 12300 12300 48844 ?? 0:00.05 python ./main.py python -v -v --firewall 12299 12299 49538 ttys000 0:00.00 grep python

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• Embed python interpreter in a python application

  - by MatToufoutu

  Hi, i'm looking for a way to ship the python interpreter with my application (also written in python), so that it doesn't need to have python installed on the machine. I searched google and found a bunch of results about how to embed the python interpreter in applications written in various languages, but nothing for applications writtent in python itself... I don't need to "hide" my code or make a binary like cx_freeze does, i just don't want my users to have to install python to use my app, that's all. Thanks.

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• Wrapping a pure virtual method with multiple arguments with Boost.Python

  - by fallino

  Hello, I followed the "official" tutorial and others but still don't manage to expose this pure virtual method (getPeptide) : ms_mascotresults.hpp class ms_mascotresults { public: ms_mascotresults(ms_mascotresfile &resfile, const unsigned int flags, double minProbability, int maxHitsToReport, const char * unigeneIndexFile, const char * singleHit = 0); ... virtual ms_peptide getPeptide(const int q, const int p) const = 0; } ms_mascotresults.cpp #include <boost/python.hpp> using namespace boost::python; #include "msparser.hpp" // which includes "ms_mascotresults.hpp" using namespace matrix_science; #include <iostream> #include <sstream> struct ms_mascotresults_wrapper : ms_mascotresults, wrapper<ms_mascotresults> { ms_peptide getPeptide(const int q, const int p) { this->get_override("getPeptide")(q); this->get_override("getPeptide")(p); } }; BOOST_PYTHON_MODULE(ms_mascotresults) { class_<ms_mascotresults_wrapper, boost::noncopyable>("ms_mascotresults") .def("getPeptide", pure_virtual(&ms_mascotresults::getPeptide) ) ; } Here are the bjam's errors : /usr/local/boost_1_42_0/boost/python/object/value_holder.hpp:66: error: cannot declare field ‘boost::python::objects::value_holder<ms_mascotresults_wrapper>::m_held’ to be of abstract type ‘ms_mascotresults_wrapper’ ms_mascotresults.cpp:12: note: because the following virtual functions are pure within ‘ms_mascotresults_wrapper’: ... include/ms_mascotresults.hpp:334: note: virtual matrix_science::ms_peptide matrix_science::ms_mascotresults::getPeptide(int, int) const ms_mascotresults.cpp: In constructor ‘ms_mascotresults_wrapper::ms_mascotresults_wrapper()’: ms_mascotresults.cpp:12: error: no matching function for call to ‘matrix_science::ms_mascotresults::ms_mascotresults()’ include/ms_mascotresults.hpp:284: note: candidates are: matrix_science::ms_mascotresults::ms_mascotresults(matrix_science::ms_mascotresfile&, unsigned int, double, int, const char*, const char*) include/ms_mascotresults.hpp:109: note: matrix_science::ms_mascotresults::ms_mascotresults(const matrix_science::ms_mascotresults&) ... /usr/local/boost_1_42_0/boost/python/object/value_holder.hpp: In constructor ‘boost::python::objects::value_holder<Value>::value_holder(PyObject*) [with Value = ms_mascotresults_wrapper]’: /usr/local/boost_1_42_0/boost/python/object/value_holder.hpp:137: note: synthesized method ‘ms_mascotresults_wrapper::ms_mascotresults_wrapper()’ first required here /usr/local/boost_1_42_0/boost/python/object/value_holder.hpp:137: error: cannot allocate an object of abstract type ‘ms_mascotresults_wrapper’ ms_mascotresults.cpp:12: note: since type ‘ms_mascotresults_wrapper’ has pure virtual functions So I tried to change the constructor's signature by : BOOST_PYTHON_MODULE(ms_mascotresults) { //class_<ms_mascotresults_wrapper, boost::noncopyable>("ms_mascotresults") class_<ms_mascotresults_wrapper, boost::noncopyable>("ms_mascotresults", init<ms_mascotresfile &, const unsigned int, double, int, const char *,const char *>()) .def("getPeptide", pure_virtual(&ms_mascotresults::getPeptide) ) Giving these errors : /usr/local/boost_1_42_0/boost/python/object/value_holder.hpp:66: error: cannot declare field ‘boost::python::objects::value_holder<ms_mascotresults_wrapper>::m_held’ to be of abstract type ‘ms_mascotresults_wrapper’ ms_mascotresults.cpp:12: note: because the following virtual functions are pure within ‘ms_mascotresults_wrapper’: include/ms_mascotresults.hpp:334: note: virtual matrix_science::ms_peptide matrix_science::ms_mascotresults::getPeptide(int, int) const ... ms_mascotresults.cpp:24: instantiated from here /usr/local/boost_1_42_0/boost/python/object/value_holder.hpp:137: error: no matching function for call to ‘ms_mascotresults_wrapper::ms_mascotresults_wrapper(matrix_science::ms_mascotresfile&, const unsigned int&, const double&, const int&, const char* const&, const char* const&)’ ms_mascotresults.cpp:12: note: candidates are: ms_mascotresults_wrapper::ms_mascotresults_wrapper(const ms_mascotresults_wrapper&) ms_mascotresults.cpp:12: note: ms_mascotresults_wrapper::ms_mascotresults_wrapper() If I comment the virtual function getPeptide in the .hpp, it builds perfectly with this constructor : class_<ms_mascotresults>("ms_mascotresults", init<ms_mascotresfile &, const unsigned int, double, int, const char *,const char *>() ) So I'm a bit lost...

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• Best practices for using memcached in Rails?

  - by Matt

  Hello everybody, as database transcations in our app are getting more and more time consuming, we have started to use memcached to reduce the amount of queries passed to MySQL. All in all, it works fine and really saves a lot of time. But as caching was "silently appearing" as a workaround to give the app more juice, a lot of our models now contain code like this: def self.all_cached Rails.cache.fetch('object_name') { find( :all, :include => [associations]) } end This is getting more and more a pain as filling and flushing the cache happens in several classes accross the application. Now, I was wondering if there was a better way to abstract memcached logic to make it more powerful and easy to use across all needed models? I was thinking about having some kind of memcached-module which is included in all needed modules. But before playing around, I thought: Let's ask experts first :-) Thanks Matt

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• Configure Symfony for use with Memcached

  - by Rob Wilkerson

  I have 2 Symfony applications (1 using 1.2.x, another using 1.4.x and both using Propel) that need to share some specific session information. Although I have no experience with memcached, my sense--after some reading--is that it may be able to serve as an external (FAST) repository that each app could read and write to. Unfortunately, I can't find much information about how to use it with Symfony in any capacity, much less in the quasi-cache, quasi-messaging server I'm envisioning. My questions, I suppose, are: Am I mistaken in believing that memcached be used in this manner and access by multiple systems? How can I configure Symfony to access a memcached repository? Thanks.

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• Using memcached/APC for session storage?

  - by Industrial

  Hi everybody, I had some thoughts back ago about using memcached for session storage, but came to the conclusion that it wouldn't be sufficient in the event of one or more of the servers in the memcached pool were about to go down. A hybrid version is to save the main database (mySQL) from load caused by reads would be to work out a function that tries to fetch the data from the cache pool, and if that fails gets it from the database. After putting some more thought into it, I started to think about using APC cache for session related data. If our web server would go down, sessions would be lost either way, so storing them in a local APC or a localhost memcached server maybe isn't that bad? What's your experiences?

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• Memcached - how to deal with adding/deploying servers

  - by Industrial

  Hi everybody, How do you handle replacing/adding/removing memcached nodes in your production applications? I will have a number of applications that are cloned and customized due to each customers need running on one and same webserver, so i'll guess that there will be a day when some of the nodes will be changed. Here's how memcached is populated by normal: $m = new Memcached(); $servers = array( array('mem1.domain.com', 11211, 33), array('mem2.domain.com', 11211, 67) ); $m->addServers($servers); My initial idea, is to make the $servers array to be populated from the database, also cached, but file-based, done once a day or something, with the option to force an update on next run of the function that holds the $addservers call. However, I am guessing that this might add some additional overhead since disks are quite slow storage... What do you think?

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• PHP memcached: getDelayed & getMulti - how to use?

  - by Industrial

  Hi everybody, I have thought a bit recently about how to use getDelayed and getMulti in a PHP application, and their difference. From reading the documentation about getDelayed: "The method does not wait for response and returns right away. When you are ready to collect the items, call either Memcached::fetch or Memcached::fetchAll." So obviously there's a need to call fetchAll before having the keys available, unlike getMulti. But when is the actual memcached call being done? At fetchAll or when getDelayed is run?

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• Memcached in a trusted shared environment?

  - by John Kary

  We are a university IT organization that hosts all of the university's websites on several shared servers on our server room floor. We have several VMs, each running its own instance of Apache as a web server for each respective server. If we were going to setup a memcached server, is it feasible to use it as a shared instance? If shared by several servers, or even multiple web apps running on the same server, what's the best way to keep each app's cache stores separate? Prefix the key? Would each VM require its own instance of memcached, or could we setup 1 memcached server and allow our multiple VMs to read/write to it?

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• python modules difference: .c/.h vs. .py

  - by bijan

  I'm very new to python, as i'm embedding it (in form of a static lib) in an ios project. It's not possible for me to dynamically load python modules, so i would like to compile my modules along with python. For modules shipped with the python source this works (by modifying setup.py or Module/Setup), but when i downloaded a third party module i noticed, i don't fully understand the mechanism. The modules shipped with python come with a .c file in the Modules dir as well as a .py file in the Lib dir. My third party module just comes with .py files. 1.Why do those modules have different file extensions? 2.How to integrate a module coming with .py files in an embedded python version? Obviously pasting them in Modules/Setup does require some .c files. 3.Do these .c files have something to do with the Python C-Api? I guess i'm missing something essential :) Help is much appreciated.

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• How long would it take to learn Python?

  - by Josh

  Hi all I have decided to take the time out after work to learn Python. Python appeals to me because at work (Web and eLearning Company), I have to follow out very repetitive tasks like delete all these tags, rename all these tasks and even more advanced repetive tasks. Additionally it would be good for me to get an understanding of Python first because of its fairly easy to learn syntax. How long would it take to learn the basics and go through these tutorials on Python (+ the Python tutorial)? I will only be spending 1 hour or so on it in the afternoons. http://openbookproject.net/thinkcs/python/english2e/index.html I have told my piano teacher I would like to take a month of learning piano to do this would this be adequate time? After this I may choose to learn PHP, because that is mainly what we use for web development at work. Thanks Josh

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• Python library for scripting (C++ integration)

  - by Edward83

  Please advise me good wrapper/library for python. I need to implement simple scripting in c++ app; Under "good" I mean pretty understandable, well documented, no memory leaking, fast. For creating base interface of GameObject on Python and C++; Your own experience and useful links will be nice!!! I found link about it, but I need more specific within gamedev context. What combinations of libraries you used for python integration into c++? For example about ogre-python it said built using Py++ and Boost.Python library And one more question, maybe someone of you know how Python was integrated into BigWorld engine (it's own port or some library)? Thank you!!!

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• Error trying to run a python program

  - by Ana

  Hello guys I'm actually new to Terminal and Python. Just started following a Python tuturial on my Ubuntu and I've reached a part where it asks me to save a .py file and open it in Terminal. Only when I try to type on Terminal $ python egotrip.py I get $: command not found Then I try to type it in python and I get File "", line 1 python egotrip.py ^ SyntaxError: invalid syntax But I mean all names are correct :( Then I gave also tried /home/anacah/Desktop/python/egotrip.py And I get Traceback (most recent call last): File "", line 1, in NameError: name 'home' is not defined What am I doing wrong? :( can someone please help?

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• Python as a first language?

  - by user64085

  I have just started working in Information Security World. I want to learn the Python language for creating my own automated tool for Fuzzing, SQL-Injection etc. My question is I don't know much about C language (only basic knowledge) but I want to learn directly Python Language so is it good? I have seen there is lots of difference between Python and C (obviously) and for Information Security field Python = GOD so I want to know learning Python need any experience on C language? If not so can I start learning Python directly?

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• Python 2.4 on Ubuntu 12.04

  - by veepsk

  I want to develop a Python application on Ubuntu 12.04 using python 2.4, but since the default version of python on ubuntu is 2.7. I cannot get the libraries and packages to work for python 2.4. I have tried using virtualenv but even with virtualenv I was not successful in installing packages for python2.4. So I would like to know if there is any reliable method to get python 2.4 to work with Ubuntu. I know that I shouldnt mess with the default version of python on ubuntu and hence I am looking for a better alternative. Thanks in advance.

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• Runtime unhandled exception while executing facedetect.py in opencv

  - by Rupesh Chavan

  When i tried to execute facedetect.py python script from opencv sample example i got the following runtime exception. Can someone please give me some pointer or some clue about the exception and why it is encountering? Here is the stack trace : 'python.exe': Loaded 'C:\Python26\python.exe' 'python.exe': Loaded 'C:\WINDOWS\system32\ntdll.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\kernel32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\python26.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\user32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\gdi32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\advapi32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\rpcrt4.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\shell32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\msvcrt.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\shlwapi.dll' 'python.exe': Loaded 'C:\WINDOWS\WinSxS \x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.30729.1_x-ww_6f74963e\msvcr90.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\imm32.dll' 'python.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2982_x-ww_ac3f9c03\comctl32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\comctl32.dll' 'python.exe': Loaded 'C:\Python26\Lib\site-packages\opencv_cv.pyd', Binary was not built with debug information. 'python.exe': Loaded 'C:\OpenCV2.0\bin\libcv200.dll', Binary was not built with debug information. 'python.exe': Loaded 'C:\OpenCV2.0\bin\libcxcore200.dll', Binary was not built with debug information. 'python.exe': Loaded 'C:\Python26\Lib\site-packages\opencv_ml.pyd', Binary was not built with debug information. 'python.exe': Loaded 'C:\OpenCV2.0\bin\libml200.dll', Binary was not built with debug information. 'python.exe': Loaded 'C:\Python26\Lib\site-packages\opencv_highgui.pyd', Binary was not built with debug information. 'python.exe': Loaded 'C:\OpenCV2.0\bin\libhighgui200.dll', Binary was not built with debug information. 'python.exe': Loaded 'C:\WINDOWS\system32\ole32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\oleaut32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\avicap32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\winmm.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\version.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\msvfw32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\avifil32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\msacm32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\msctf.dll' 'python.exe': Loaded 'C:\OpenCV2.0\bin\libopencv_ffmpeg200.dll', Binary was not built with debug information. 'python.exe': Loaded 'C:\WINDOWS\system32\wsock32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\ws2_32.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\ws2help.dll' 'python.exe': Loaded 'C:\WINDOWS\system32\MSCTFIME.IME' Unhandled exception at 0x00e7e4e4 in python.exe: 0xC0000005: Access violation reading location 0xffffffff. Thanks a lot in advance, Rupesh Chavan

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• Will python 3 ever catch on?

  - by TheMoonMaster

  I have been learning a bit of Python 2 and Python 3 and it seems like Python 2 is over all better than Python 3. So that's where my question comes in. Are there any good reasons to actually switch over to python 3?

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• Will Python 3.0's backwards-incompatibility affect adoption?

  - by George Stocker

  I visited Slashdot this morning to find out that Python 3.0 has been released. I know C# and Perl, but have wanted to learn Python for some time, especially after I saw its ease of use to create useful tools, not to mention its use in game scripting. My question is, how does the intentionally backwards-incompatible release of Python 3.0 affect adoption, and should I learn Python 2? Or should I take the dive and learn Python 3.0 first, and wait for the libraries to be ported?

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• Can one Python project use both 2.x and 3.x code?

  - by Begbie00

  Hi all - I'm going to start on a long (~1-year) programming project in Python. I want to use wxPython for my GUI (supports 2.6), but I also want to use 3.1 for the rest of the project (to start using the 3.x syntax). Is there any way for me to design a project that mixes 2.x and 3.x modules? Or should I just bite the bullet and use either 2.x (preferred, since I really want to learn wxPython) or 3.x throughout? Thanks, Mike

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• spymemcached (Java Memcached Client)

  - by Java Guy

  Is there a way to collect the memcached stats using this API (spymemcached)? I know there are tools like cacti to collect information on Memcached Server. But I would like to collect, say, memory usage by each item I have put into the server--the total no. of items in the same category, etc... more importantly, the bytes used by individual pieces.

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• What is the standard way to deploy memcached?

  - by Tom

  I have two IIS servers and two MySQL servers. On all servers I have some available memory (More than a GB). What is the standard way to deploy memcached? Should I add a new server especially for memcached, or should I use my existing servers? If so, which servers? Thanks in advance

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