Python 继承: TypeError: object.__ init__()不接受任何参数

我得到了这个错误:

TypeError: object.__init__() takes no parameters

当运行我的代码时，我并不知道我在这里做错了什么:

class IRCReplyModule(object):


activated=True
moduleHandlerResultList=None
moduleHandlerCommandlist=None
modulename=""


def __init__(self,modulename):
self.modulename = modulename




class SimpleHelloWorld(IRCReplyModule):


def __init__(self):
super(IRCReplyModule,self).__init__('hello world')
68822 次浏览
小开
最佳答案

You are calling the wrong class name in your super() call:

class SimpleHelloWorld(IRCReplyModule):


def __init__(self):
#super(IRCReplyModule,self).__init__('hello world')
super(SimpleHelloWorld,self).__init__('hello world')

Essentially what you are resolving to is the __init__ of the object base class which takes no params.

Its a bit redundant, I know, to have to specify the class that you are already inside of, which is why in python3 you can just do: super().__init__()

小开

This has bitten me twice recently (I know I should have learned from my mistake the first time) and the accepted answer hasn't helped me either time so while it is fresh in my mind I thought I would submit my own answer just in case anybody else is running into this (or I need this again in future).

In my case the issue was that I was passing a kwarg into the initialisation of the subclass but in the superclass that keyword arg was then being passed though into the super() call.

I always think these types of things are best with an example:

class Foo(object):
def __init__(self, required_param_1, *args, **kwargs):
super(Foo, self).__init__(*args, **kwargs)
self.required_param = required_param_1
self.some_named_optional_param = kwargs.pop('named_optional_param', None)


def some_other_method(self):
raise NotImplementedException


class Bar(Foo):
def some_other_method(self):
print('Do some magic')




Bar(42) # no error
Bar(42, named_optional_param={'xyz': 123}) # raises TypeError: object.__init__() takes no parameters

So to resolve this I just need to alter the order that I do things in the Foo.__init__ method; e.g.:

class Foo(object):
def __init__(self, required_param_1, *args, **kwargs):
self.some_named_optional_param = kwargs.pop('named_optional_param', None)
# call super only AFTER poping the kwargs
super(Foo, self).__init__(*args, **kwargs)
self.required_param = required_param_1

提交答案