Adding method to the class from outside of the class

Question

I want to add method1 to my class from outside of my class. Also I want to call method1 from inside of my class in order to changing the ‘homework’ to 0

def method1(self):
    print("Processing.....")
    print("Done :D")
    self.homework = 0

class S:
    homework = 10
    def homeworkremover(self):
        S.method1 = method1
        S.method1()

a = S()
print(a.homeworkremover())

But I’ve received an error code:

TypeError: method1() missing 1 required positional argument: 'self'

Can you help me out pls?

Asked By: Berke Balcı

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Source

Answer 1

The example seems quite contrived, I can’t quite see the use of it in its current form (adding a new method on a class from within a method that is being executed on an instance of the class).

But to make it work nevertheless, simply replace:

Sss.method1()

with

self.method1()

since the added method is intended as an instance method and not a class method.

On a side note, instead of

Sss.method1 = method1

it might be better to use:

self.__class__.method1 = method1

(less dependent on the class name, and works better as well in class inheritance scenarios)

Answered By: Philippe

Adding method to the class from outside of the class

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