删除重复行

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: f0rsaken

import sys

def main():
    try:
        filename = sys.argv[1]
    except IndexError as e:
        print(e)
        sys.exit(2)

    try:
        with open(filename, "r") as f:
            temp_list = f.readlines()
    except IOError as e:
        print(e)
        sys.exit(1)

    content_list = list()
    for temp in temp_list:
        content_list.append(temp.rstrip() + "\n")

    new_content_list = list()
    for content in content_list:
        if content not in new_content_list:
            new_content_list.append(content)

    with open("new_" + filename, "w") as f:
        f.writelines(new_content_list)

if __name__ == "__main__":
    main()