#!/usr/local/bin/python3
#AUTHOR:anqixiang
#DATE:2020-01-26
#MODIFY:
#FUNCTION:提取出name2文件有而name1文件没有的部分，并保存到save_file文件中

name1 = '/etc/passwd'
name2 = '/tmp/mima'
save_file = '/tmp/result.txt'   #存放结果

def diff():
    with open(name1) as f1:
        aset = set(f1)
    with open(name2) as f2:
        bset = set(f2)
    with open(save_file, 'w') as f3:
        f3.writelines(bset - aset)
        print('结果保存在:%s' % save_file)

if __name__ == '__main__':
    diff()