#!/usr/bin/python
# -*- encoding=utf-8 -*-
# author: Ian
# e-mail: stmayue@gmail.com
# description: 


def list_to_dict(in_list):
    return dict((i, in_list[i]) for i in range(0, len(in_list)))


def exchange_key_value(in_dict):
    return dict((in_dict[i], i) for i in in_dict)


def main():
    pass


if __name__ == '__main__':
	main()
