> python Python 2.0 (#1, Oct 16 2000, 18:10:03) [GCC 2.95.2 19991024 (release)] on linux2 >>> >>>class Friendly: ... def hello(self): ... print 'Hello' ... >>> class Person: ... pass ... >>> p = Person() >>> p.hello() Traceback (most recent call last): File "<stdin>", line 1, in ? AttributeError: 'Person' instance has no attribute 'hello'