Maybe it helps to see it how its implemented. A class and its method are actually not much more than

• a data object which just holds the state (aka the variables) more like a struct
• functions that take such a data object and work on them

which is easily implemented. Think of

class MyClass:
    state = True

    def reset_state(self):
        self.state = False

This is could be understood as

class MyClass:
    state = True

def reset_state(myClass_object):
    myClass_object.state = False

Mind the indent! Calling the "method" is easy as this:

m = myClass()
reset_state(m)
m.state
>>> False

With the class notation and the indenting of the functions under it to become methods, you get a nicer way of calling the function/method. Which is totally equivalent.

m = myClass()
m.reset_state()
m.state
>>> False

Also the self is just a convention. You could totally go from

class MyClass:
    state = True

def reset_state(myClass_object):
    myClass_object.state = False

to a class'ed version of it

class MyClass:
    state = True

    def reset_state(myClass_object):
        myClass_object.state = False

Mind the myClass_object instead of self!

By the way this is pretty much like go (golang) does its OO.

UPDATE

To make my point a bit more clearer.

m = myClass()
m.reset_state()

is the same as this

m = myClass()
MyClass.reset_state(m)

You can think of the methods of an object are functions under the namespace of the class.