无聊乱跪

py_set.py

#coding=utf-8

if __name__ == '__main__':
    with open("input.txt") as data:
        a, b = map(set,zip(*[line.split() for line in data]))
        
    print 'a,b两集合里都包含的元素'
    for item in a.union(b):
        print item
    print '-'*20

    print 'a有而b没有的'
    for item in a.difference(b):
        print item
    print '-'*20

    print 'b有而a没有的'
    for item in b.difference(a):
        print item
    print '-'*20