Listing modules from all installed packages

Discussion in 'Python' started by Julien Phalip, Jun 9, 2013.

  1. Hi,

    I'm trying to write a function that programmatically obtains and returns the exact location of all first-level modules for all installed packages.

    For example, if the packages named 'django' and 'django-debug-toolbar' are installed, I'd like this function to return something like:/Users/my_user/.virtualenvs/my_venv/lib/python2.6/site-packages/django

    That is, this function needs to consider all installed packages, including those that have been installed in "edit" mode (i.e. in the src/ folder). Note also that the main module for the 'django-debug-toolbar' is in fact named 'debug_toolbar'.

    So far the closest I've been to retrieving the list of first-level modules is as follows:

    import os
    import pkg_resources
    import setuptools

    pkgs = set()

    for dist in pkg_resources.working_set:
    if os.path.isdir(dist.location):
    for pkg in setuptools.find_packages(dist.location):
    if '.' not in pkg:

    The idea is then to loop through that list of modules, import them and get their exact locations by fetching their __file__ attribute values.

    However, this feels very hackish and I don't think it's actually quite correct either. I'm sure there must be a better way. If possible I'd also like to avoid having to use setuptools.

    Do you have any tips on how to achieve this?

    Many thanks!

    Julien Phalip, Jun 9, 2013
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  2. print '\n'.join([re.findall("from '(.*)'",str(v))[0] for k,v in sys.modules.items() if str(v).find('from')>-1])
    Carlos Nepomuceno, Jun 9, 2013
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  3. Just realized that you've asked for installed packages. Perhaps the following will do the trick. I don't know why the 'lib-tk' isn't included. Why not?

    toplevel_packages = ['%s\\%s'%(ml.path,name)for ml,name,ispkg in pkgutil.iter_modules() if ispkg]
    print '\n'.join(toplevel_packages)
    Carlos Nepomuceno, Jun 9, 2013
  4. Julien Phalip

    cclauss Guest

    Adding : python -c 'help("modules") to the other two suggestions:

    #!/usr/bin/env python

    import commands, pkgutil, re, sys

    print('\n'.join(sorted([re.findall("from '(.*)'",str(v))[0] for k,v in sys.modules.items() if str(v).find('from')>-1])))

    toplevel_packages = ['%s\\%s'%(ml.path,name)for ml,name,ispkg in sorted(pkgutil.iter_modules()) if ispkg]
    print '\n'.join(toplevel_packages)

    theCommand = "python -c 'help(\"modules\")'"
    print('\n{} # this may take a few seconds...'.format(theCommand))
    print(commands.getstatusoutput(theCommand)[1]) # help() only works in the python interpreter...
    cclauss, Jun 9, 2013
  5. Carlos Nepomucenoæ–¼ 2013å¹´6月9日星期日UTC+8下åˆ1時23分15秒寫é“:
    Please use a dictionary to store a tree first.
    Then it is trivial to walk through all nodes of the tree.
    88888 Dihedral, Jun 9, 2013
  6. Thanks a lot Carlos, this gives me exactly what I needed!

    Best wishes,

    Julien Phalip, Jun 14, 2013
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