python中交集并集用什么符号表示_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 &

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