#類也是對象，type創建類的類
def create_class(name):
    if name == "user":
        class User:
            def __str__(self):
                return "user"
        return User
    elif name == "company":
        class Company:
            def __str__(self):
                return "company"
        return Company

 
#type動態創建類
# User = type("User", (), {}) #名稱，繼承（要繼承的base類），屬性或方法（但是要字典形式）

def say(self):
    return "i am user"
    # return self.name


class BaseClass():
    def answer(self):
        return "i am baseclass"


class MetaClass(type): #繼承type為元類
    def __new__(cls, *args, **kwargs):
        return
 
 super().__new__(cls, *args, **kwargs)

from collections.abc import *

#什麽是元類， 元類是創建類的類 對象<-class(對象)<-type
class User(metaclass=MetaClass):
    def __init__(self, name):
        self.name = name
    def __str__(self):
        return "user"
#python中類的實例化過程，會首先尋找metaclass，通過metaclass去創建user類
#type去創建類對象，實例
 


if __name__ == "__main__":
    # MyClass = create_class("user")
    # my_obj = MyClass()
    # print(type(my_obj))

    # User = type("User", (BaseClass, ), {"name":"user", "say":say})
    my_obj = User(name="bobby")
    print(my_obj)

元類編程-- metaclass