调用元类基数时，object .__ init __()不带参数 [英] When calling the metaclass bases, object.__init__() takes no parameters

问题描述

当我尝试使用这种单例方法时:

When I try to use this one approach of singleton:

class Singleton(object):                                                     
    def __init__(self, name, bases, dict):                                   
        super(Singleton, self).__init__(name, bases, dict)                   
        self._instance = None                                                

    def __call__(self):                                                      
        if self._instance is None:                                           
            self._instance = super(Singleton, self).__call__()
        return self._instance                                                


class NewClass(object):      
    __metaclass__ = Singleton

我遇到一个错误:

调用元类基数时出错 对象. init ()不带参数

Error when calling the metaclass bases object.init() takes no parameters

我不确定，我是否正确理解参数采用的是__init__方法:name, bases, dict.而实际上-我的错误/理解力在哪里?

I'm not sure, am I correctly understand what the arguments are takes __init__ method: name, bases, dict. And actually - where is my mistake/incomprehension?

推荐答案

元类是从type而不是object派生的.

Metaclasses derive from type, not object.

这篇关于调用元类基数时，object .__ init __()不带参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！