<human>:  mechanize how to identify login form by id.
<bot>: Here is a Python function to mechanize identify login form by id

import re

def get_login_form_by_id(id):
  """
  Mechanize how to identify login form by id
  """
  return "<input type='hidden' name='" + id + "' value='" + id + "'>"

# Enter the id
id = "1234567890123456789012345678901234567890"

# Calling the function
print((get_login_form_by_id(id)))

#Example Output
# <input type='hidden' name='1234567890123456789012345678901234567890' value='1234567890123456789012345678901234567890'>

#Remember to inspect code for bugs.