How to get module's dir info in code

import sys

import os

def usage():

   print '''Use example:

python dirinfo.py ctypes

'''

def main(mod):

   mod_file = os.path.join(os.getcwd(), '%s.txt'%mod)

   fp = open(mod_file, 'w')

   # use __import__ to import a module

   # that passed as a string

   mod = __import__(mod)

   for item in dir(mod):

      print item

  print >> fp, item

   fp.close()

if __name__ == '__main__':

   for arg in sys.argv:

        print arg

   if len(sys.argv) != 2:

        usage()

    else:

       mod = sys.argv[1]

      main(mod)