Changing Lutz's mydir from Edition 2, Learning Python

[W. eWatson]

See Subject. The code is below with a few changes I made at the bottom 
by inserting
     import string
     import numpy

     module = raw_input("Enter module name: ")
     listing(module)

I thought I'd see if I could convert this to a program instead, which 
asks the user for the module.

As prompt entry, it was meant to do this, for example:

import math
import pynum
mydir.listing(numpy)

As below, it fails with:


Is it possible to get this to work?
Enter module name: numpy
------------------------------
name:
Traceback (most recent call last):
   File 
"C:/Sandia_Meteors/Sentinel_Development/Learn_Python/mydir_pgm.py", line 
31, in <module>
     listing(module)
   File 
"C:/Sandia_Meteors/Sentinel_Development/Learn_Python/mydir_pgm.py", line 
8, in listing
     print "name:", module.__name__, "file:", module.__file__
AttributeError: 'str' object has no attribute '__name__
============================mydir start===========
# a module that lists the namespaces of other modules

verbose = 1

def listing(module):
     if verbose:
         print "-"*30
         print "name:", module.__name__, "file:", module.__file__
         print "-"*30

     count = 0
     for attr in module.__dict__.keys():      # scan namespace
         print "%02d) %s" % (count, attr),
         if attr[0:2] == "__":
             print "<built-in name>"          # skip __file__, etc.
         else:
             print getattr(module, attr)      # same as .__dict__[attr]
         count = count+1

     if verbose:
         print "-"*30
         print module.__name__, "has %d names" % count
         print "-"*30

if __name__ == "__main__":
     import mydir
     import string
     import numpy

     module = raw_input("Enter module name: ")
     listing(module)
     #listing(mydir)      # self-test code: list myself
===================end==========