Why does this class run?

Question

I\'ve been playing with my codes a little for a while, and this one is not about a bug or anything, but i just don\'t understand why class main() runs without needing to ini

Answer 1

Unlike many other languages, class body is an executable statement in Python and is executed immediately as the interpreter reaches the class line. When you run this "program":

class Foo:
    print("hey")

it just prints "hey" without any Foo object being created.

The same applies to the function definition statement def (but not to function bodies). When you run this:

def foo(arg=print("hi")):
    print("not yet")

it prints "hi", but not "not yet".