In the language reference, compound statements, class definitions:"""Programmer’s note: Variables defined in the class definition are class can be set in a method with self.name = value."""This sentence doesn't is not even grammatically valid. It seems that there is something missing after "are class".See:http://docs.python.org/dev/3.0/reference/compound_stmts.html#class-definitionsIn 2.5, the corresponding text is:"""Programmer's note: Variables defined in the class definition are class variables; they are shared by all instances. To define instance variables, they must be given a value in the __init__() method or in another method."""

Thanks fixed inr64581.