python语法，字典中的值如何改变

Question

用values把所有值遍历出来，然后怎么做运算，比如全部乘m，再更新字典

Answer 1

掌握字典的三个方法： .items() .keys() .values()

>>> dic = {1:1,2:2,3:3,4:4}
>>> m=4
>>> {i:j*m for i,j in dic.items()}
{1: 4, 2: 8, 3: 12, 4: 16}
>>> {i:j*m for i,j in zip(dic,dic.values())}
{1: 4, 2: 8, 3: 12, 4: 16}
>>> {i:j*m for i,j in zip(dic.keys(),dic.values())}
{1: 4, 2: 8, 3: 12, 4: 16}