A simple class


class Stack:
 def __init__(self):
    self.stack = []

 def push(self, x):
    self.stack.append(x)

 def pop(self):
    return self.stack.pop()

 def isempty(self):
    return not len(self.stack)

All methods take "self" argument
All members and methods are public by default
Python Language Reference shows how to implement classes that act like native types