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usage: du.py [options] [-d DIR]
where directory will be searched for largest subdirectory

options:
  --version   show program's version number and exit
  -h, --help  show this help message and exit
  -d DIR      directory (default is current)

#!/usr/bin/env python
import os, sys
from optparse import OptionParser

def getdirsize(base):
  size = 0
  for root, dirs, files in os.walk(base):
    for file in files:
      filepath = os.path.join(root, file)
      if os.path.islink(filepath): continue
      size = size + os.path.getsize(filepath)
  return size


usage = "usage: %prog [options] [-d DIR]\n\
where directory will be searched for largest subdirectory"

parser = OptionParser(usage, version="%prog version 0.1")

parser.add_option("-d", action = "store", type = "string",
default = os.getcwd(), dest="dir", help="directory (default is current)")

(options, args) = parser.parse_args()

if not os.path.isdir(options.dir):
  print "Sorry, %s is not a valid directory" %options.dir
  sys.exit(-1)

size_max = -1
for directory in os.listdir(options.dir):
  dir_fullpath = os.path.join(options.dir, directory)
  if not os.path.isdir(dir_fullpath):
    continue
  size = getdirsize(dir_fullpath)
  if size > size_max:
    size_max = size
    dir_max = directory

if size_max != -1:
  print 'Directory "%s" contains largest subdirectory\n\
  "%s", with size of %d bytes.'%(options.dir, dir_max, size_max)
else:
  print 'Directory "%s" does not contain any subdirectory' %options.dir