Python to determine the number of times a message is repeated in text

#coding:gbk
'''
Created on 2012-2-3
Read text from a file and determine how many messages such as "message0" and "message123" are duplicates in the text.
@author: Administrator
'''
import re
if __name__ == '__main__':
  pattern = u"(message((\d)+))"
  prog = (pattern)
  # read text from file
  f = open("","r")
  text = unicode(())
  ()
  result = (text)
  message_map = dict()
  redupicate_count = 0
  for message in result:
    if message_map.has_key(message[0]) == True:
      print message[0], "is reduplicate"
      redupicate_count += 1
    else :
      message_map[message[0]] = 1;
  print "total reduplicate message is ", redupicate_count