fromkeys会返回新的字典与原字典没关系,直接用字典去访问fromkeys不会对字典产生影响的
dic = {} a = dic.fromkeys("abc",[1,2,3]) #前面的会迭代添加,后面不会 print(a) <<<<{'a': [1, 2, 3], 'b': [1, 2, 3], 'c': [1, 2, 3]}
fromkeys会返回新的字典与原字典没关系,直接用字典去访问fromkeys不会对字典产生影响的
dic = {} a = dic.fromkeys("abc",[1,2,3]) #前面的会迭代添加,后面不会 print(a) <<<<{'a': [1, 2, 3], 'b': [1, 2, 3], 'c': [1, 2, 3]}