[PYTHON]python中比较两个list的区别与共同项

在Python中，查找两个list中共同项，或者区别项，可以通过set（集合）来完成。 set中包含现成的比较方法.difference与.intersection 假设两个list为list1,list2,先将两个list转为set： s_list1=set(list1) s_list2=set(list2) s_list1.difference(s_list2)表示返回list1中与list2不同的item的list s_list1.intersection(s_list2)表示返回list1与list2中相同的item的list 以下程序为例： list1=[‘apple’, ‘banana’,‘peach’,‘watermelon’] list2=[‘strawberry’, ‘watermelon’] s_list1=set(list1) s_list2=set(list2) print(“s_list1=”, end=‘’) print(s_list1) print(“s_list2=”, end=‘’) print(s_list2) print(“Items in s_list1 DIFFERENT from items in s_list2 are:”) out = s_list1.difference(s_list2) print(out) print(“Items in s_list2 DIFFERENT from items in s_list1 are:”) out = s_list2.difference(s_list1) print(out) print(“Items in s_list1 SAME with items in s_list1 are:”) out = s_list1.intersection(s_list2) print(out) -----------------------------------------结果为----------------- s_list1={‘apple’, ‘banana’, ‘peach’, ‘watermelon’} s_list2={‘watermelon’, ‘strawberry’} Items in s_list1 DIFFERENT from items in s_list2 are: {‘apple’, ‘banana’, ‘peach’} Items in s_list2 DIFFERENT from items in s_list1 are: {‘strawberry’} Items in s_list1 SAME with items in s_list1 are: {‘watermelon’}