In a python class, how should I invoke a non-instance method of the class from another method of the same class? [duplicate]

Question

Consider this class containing methods without a self argument:

class C:
    def foo(a,b):
        # function does something
        # It is not an instance method (i.e. no 'self' argument)

    def bar(self):
        # function has to call foo() of the same class
        foo('hello', 'world')

The above code errors when non-instance method foo() is called within bar(). Somehow the name 'foo' is not recognized even though it's a method within the same class body. If it were an instance method, it could be called using self.foo() but here that's not the case.

What's the best way to invoke foo() for the above example?

# 1 Like this?
C.foo('hello', 'world')

# 2 Like this?
self.__class__.foo('hello', 'world')

# Something else?

Answer 1

You can't define a function with def key words and don't put any indented block right after.

class C:
    def foo(a,b):
        # function does something
        # It is not an instance method (i.e. no 'self' argument)
        return 0

    def bar(self):
        # function has to call foo() of the same class
        foo('hello', 'world')

and then call C.foo('hello','world'). If it is not an instance method you'd better define it as a function outside the class definition though.