"AttributeError: 'NoneType' object has no attribute" when creating class [closed]

Question

I have defined a simple class but recieve the error AttributeError: 'NoneType' object has no attribute 'bar' when trying to use it. What am I doing wrong?

def Foo():
    a = 0
    def bar(self):
        return self.a

f = Foo()
f.bar() # error

Answer 1

This is the syntax to define a function

def Foo():

to define a class you'd say

class Foo: