Listing modules from all installed packages

[cclauss at bluewin.ch]

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

#!/usr/bin/env python

import commands, pkgutil, re, sys

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

print('\npkgutil.iter_modules()...')
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...