Unable to get a list of installed Python modules

I would like to get a list of Python modules, which are in my Python installation (UNIX server).

How can you get a list of Python modules installed in your computer?

From stackoverflow

• From the shell

  ls site-packages
  

  If that's not helpful, you can do this.

  import sys
  import os
  for p in sys.path:
      print os.listdir( p )
  

  And see what that produces.

  vezult : which site-packages directory? This might do better: ls /usr/{local/,}lib/python$(python -V 2>&1|cut -d" " -f2 |cut -d. -f1-2)/site-packages

  dF : Also this will not show built-in modules, or modules in a custom PYTHONPATH, or ones installed in setuptools "development mode" etc.

  Masi : My /usr/local/lib/python2.5/site-packages is empty, although I have installed modules.

  S.Lott : @dF: While true, I don't see how any of those alternatives are relevant to the question.

  S.Lott : @Masi: Interesting. You'll have to look at sys.path to see all the places they might have been put.

• help('modules')
  

  in a Python shell/prompt.

  Masi : I get such a warning: FutureWarning: apt API not stable yet warnings.warn("apt API not stable yet", FutureWarning). I did not get a list of Python modules. I am using Python 2.5.

  ChristopheD : Could you paste the entire warning at for example http://paste.pocoo.org and post the link here?

  bobince : “/usr/lib/python2.5/site-packages/apt/__init__.py:18: FutureWarning: apt API not stable yet” is normal on Debian/Ubuntu Pythons, an artefact of attempting to graft apt packages into Python package management. I still see the (textual) list of modules.

  dF : Also `pydoc modules` from the shell should work.

  Abizern : @dF `pydoc modules` works. You should submit it as an answer.

  Masi : @Christopher: http://paste.pocoo.org/show/112078/

  Masi : @dF: pydoc modules, gives me the exactly same output as in python shell: help('modules')

  ChristopheD : @Masi: matplotlib related problem according to http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=519965 Should be fixed in the latest version available from http://matplotlib.sourceforge.net/ @Abizern: pydoc modules and help('modules') do the same thing...

  Masi : @ChristopheD: How can I see the version of my matplotlib? I tried import matplotlib; matplotlib --version unsuccessfully.