A *namespace* is a mapping from names to objects. Most namespaces are currently

implemented as Python dictionaries, but that's normally not noticeable in any

way (except for performance), and it may change in the future. Examples of

built-in exception names); the global names in a module; and the local names in

a function invocation. In a sense the set of attributes of an object also form

a namespace. The important thing to know about namespaces is that there is