python 中根据值返回键
001、
>>> dict1 = {"aa":500, "bb":400, "cc":700, "dd":300} >>> dict1 {'aa': 500, 'cc': 700, 'dd': 300, 'bb': 400} >>> dict1.keys()[dict1.values().index(300)] ## 根据值返回键 'dd' >>> dict1.keys()[dict1.values().index(700)] 'cc' >>> dict1.keys()[dict1.values().index(400)] 'bb' >>> dict1.keys()[dict1.values().index(500)] ## 根据值返回键 'aa'