python的交集、并集、差集

①差集

方法一:

if __name__ == '__main__':
a_list = [{'a' : 1}, {'b' : 2}, {'c' : 3}, {'d' : 4}, {'e' : 5}]
b_list = [{'a' : 1}, {'b' : 2}]
ret_list = []
for item in a_list:
if item not in b_list:
ret_list.append(item)
for item in b_list:
if item not in a_list:
ret_list.append(item)
print(ret_list)
执行结果:

方法二:

if __name__ == '__main__':
a_list = [{'a' : 1}, {'b' : 2}, {'c' : 3}, {'d' : 4}, {'e' : 5}]
b_list = [{'a' : 1}, {'b' : 2}]
ret_list = [item for item in a_list if item not in b_list] + [item for item in b_list if item not in a_list]
print(ret_list)
执行结果:


方法三:

if __name__ == '__main__':
a_list = [1, 2, 3, 4, 5]
b_list = [1, 4, 5]
ret_list = list(set(a_list)^set(b_list))
print(ret_list)
执行结果:

注:此方法中,两个list中的元素不能为字典

②并集

if __name__ == '__main__':
a_list = [1, 2, 3, 4, 5]
b_list = [1, 4, 5]
ret_list = list(set(a_list).union(set(b_list)))
print(ret_list)
执行结果:

注:此方法中,两个list中的元素不能为字典

③交集

if __name__ == '__main__':
a_list = [1, 2, 3, 4, 5]
b_list = [1, 4, 5]
ret_list = list((set(a_list).union(set(b_list)))^(set(a_list)^set(b_list)))
print(ret_list)
执行结果:

注:此方法中,两个list中的元素不能为字典
---------------------
作者:cuckoo5
来源:CSDN
原文:https://blog.csdn.net/wudj810818/article/details/50403424
版权声明:本文为博主原创文章,转载请附上博文链接!

猜你喜欢

转载自www.cnblogs.com/zi-lin-xia-tian/p/9813116.html