操作

字典内元素的个数

            
              
                len
              
              
                (
              
              dic
              
                )
              
            
          

判断字典中是否存在某个键

            
              dic
              
                =
              
              
                {
              
              
                "domain"
              
              
                :
              
              
                "csdn.net"
              
              
                ,
              
              
                "expiry"
              
              
                :
              
              
                1561747176.199094
              
              
                ,
              
              
                "httpOnly"
              
              
                :
              
               false
              
                ,
              
              
                "name"
              
              
                :
              
              
                "dc_tos"
              
              
                ,
              
              
                "path"
              
              
                :
              
              
                "/"
              
              
                ,
              
              
                "secure"
              
              
                :
              
               false
              
                ,
              
              
                "value"
              
              
                :
              
              
                "pttcq0"
              
              
                }
              
              
                if
              
              
                'expiry'
              
              
                in
              
               dic
              
                :
              
              
                print
              
              
                (
              
              
                "存在"
              
              
                )
              
            
          

https://www.cnblogs.com/xmnote/p/9334880.html

删除键值对

            
              my_dict 
              
                =
              
              
                {
              
              
                "name"
              
              
                :
              
              
                "123"
              
              
                ,
              
              
                "age"
              
              
                :
              
              
                123
              
              
                }
              
              
                del
              
               my_dict
              
                [
              
              
                "name"
              
              
                ]
              
            
          

https://www.cnblogs.com/lowmanisbusy/p/9142199.html