encode and decode between int,long and string by Python

gistfile1.py

import struct, base64

def long_to_str(value):
  value = struct.pack('q', value)
  value = base64.urlsafe_b64encode(value)
  value = value.rstrip('=')
  value = value.rstrip('A')
  return value


def str_to_long(value):
  num_a = 11 - len(value)
  if num_a:
    value = value + ('A' * num_a)
  value = value + '='
  value = base64.urlsafe_b64decode(value)
  return struct.unpack('q', value)[0]