Global Discrepency

#configuration.py
4  USER = ''


#communicator.py
 10     def login(username,password):
  9         f = open(USER_PATH, 'r')
  8         global USER
  7         while True:
  6             line = f.readline()
  5             if len(line) == 0:
  4                 login_status_label.set_label("No user found")
  3                 break
  2             data = line.split(",")
  1             if data[0] == username:
65                  if data[4] == password:
  1                     login_status_label.set_label("Success!")
  2                     USER = username
  3                     authorize.close()
  4                     break
  5                 else:
  6                     login_status_label.set_label("Incorrect Passwo
  7                     break
  8         if USER != '':
  9             login_button.set_label(USER)

#handler.py
15     def on_submitButton_clicked(self, *args):
 16         info_buffer = info_display.get_buffer()
 17         chat_input = chat_entry.get_text()
 18         if (chat_input != ""):
 19             chat_input += '\n'
 20             info_buffer.insert(info_buffer.get_end_iter(),USER + "
 21             f = open(ACTIVE_LOG_PATH, 'a')
 22             f.write(USER + ": " + chat_input)
 23             f.close()
 24             chat_entry.set_text("")