CODEWITHSUNDEEP
python
fabiano.mota
fabiano.mota

Reputation: 307

TypeError: f2() takes 1 positional argument but 2 were given

My code

class MyClass:
    i =123

    def f2(a):
        global b
        print (a)
        print (b)
        b = 9

x = MyClass()
x.f2(1)

It does not work as expected

TypeError: f2() takes 1 positional argument but 2 were given

Why? How to inspect function and positional arguments? If I change

x.f2()
<__main__.MyClass object at 0x7fb3f028fbe0>
9

In this case I can not pass a.

Upvotes: 0

Views: 933

Answers (3)

gauravtolani
gauravtolani

Reputation: 130

One of the 'OOP' reasons to create functions inside a class are inheriting constructors.

You've created the class 'MyClass' and the function f2() is one of the functions inside it.

To convey that the function belongs to/ is a part of the class, you have to pass a default parameter 'self' in the function or it is not recognized by the interpreter.

Coming to your error: You are passing 1 to the function, but by default there is a 'self' passed to all the class functions. Two solutions possible,

  1. Either make the function static by the decorator 

    @static

def f2(a):

    pass

    *this conveys that the function is just inside the class but doesn't belong to it. It just is there.

  2. pass a 'self' in the function. 

    def f2(self, a):
    pass

Hope it helps.

Upvotes: 2

Sigma65535
Sigma65535

Reputation: 381

class MyClass:
    i =123
    def f2(self,a):
        global b
        print (a)
        print (b)
        b = 9

write as this ,you will work ok

Upvotes: 2

Albin Paul
Albin Paul

Reputation: 3419

class MyClass:
    i =123

    def f2(self,a):
        print (a)

x = MyClass()
x.f2(1)

OUTPUT 

1

Upvotes: 2

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