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Listing modules from all installed packages in python

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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:

installed_modules()
/Users/my_user/.virtualenvs/my_venv/lib/python2.6/site-packages/django
/Users/my_user/.virtualenvs/my_venv/src/debug_toolbar

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:
 pkgs.add(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.

Does anyone have any tips on how to achieve this?

posted Jun 9, 2013 by anonymous

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2 Answers

0 votes

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

answer Jun 9, 2013 by anonymous
0 votes

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)

answer Jun 9, 2013 by anonymous
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