python 学习之路-day7

集合

‘‘‘s1 = {"121231","23421342","241432"}s2 = {"17283971829","2384908213904","121231"}# print (s1.difference(s2))# print (s1.symmetric_difference(s2))# s1.difference_update(s2)# print(s1)li = [11,12,13,14,15]s1.update(li)print (s1)‘‘‘old_dict = {    "#1":8,    "#2":4,    "#4":2,}new_dict = {    "#1":4,    "#2":4,    "#3":2,}

old_set = set(old_dict.keys())new_set = set(new_dict.keys())remove_set = old_set.difference(new_set)add_set = new_set.difference(old_set)print (old_set.intersection(new_set))