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)
 

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)

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)
 

注：此方法中，兩個list中的元素不能為字典

②並集

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)

注：此方法中，兩個list中的元素不能為字典

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)
 

注：此方法中，兩個list中的元素不能為字典