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Inheritance
The whole point of a namespace tool like the class statement is to support name inheritance. This section expands on some of the mechanisms and roles of attribute inheritance in Python.
In Python, inheritance happens when an object is qualified, and it involves searching an attribute definition tree (one or more namespaces). Every time you use an expression of the form object.attr (where object is an instance or class object), Python searches the namespace tree from bottom to top, beginning with object, looking for the first attr it can find. This includes references to self attributes in your methods. Because lower definitions in the tree override higher ones, inheritance forms the basis of specialization.
