Find all modules of a given name on the Python path. This is similar to running `which -a <cmd>` on the Linux Bash shell.

find_all_modules.py

from __future__ import print_function

import sys
import imp


def find_all(modname, paths=None):
    """Find all occurrences of a given module on a given list of paths.

    If no paths are given, sys.path is used.
    """
    paths = paths or sys.path

    for path in paths:
        try:
            info = imp.find_module(modname, [path])
        except ImportError:
            pass
        else:
            mod = imp.load_module(modname, *info)
            yield mod, path, info


if __name__ == '__main__':
    for info in find_all('PySide'):
        print(info)