switch case in python doesn't work; need another pattern

Question

I need a help with a code here, i wanted to implement the switch case pattern in python so like some tutorial said , i can use a dictionary for that but here is my problem:<

Answer 1

message = { 'create':msg(some_data or ''),
            'update':msg(other_data or '')
            # can have more
          }

Better yet, to prevent msg from being executed just to fill the dict:

message = { 'create':(msg,some_data),
            'update':(msg,other_data),
            # can have more
          }
func,data=message[msg_type]
func(data)

and now you are free to define a more sensible msg function which can deal with an argument equal to None:

def msg(data):
    if data is None: data=''
    ...