The following link is a  good reference document on python exceptionshttps://docs.python.org/2/library/exceptions.html

Namespace is a way to implement scope. In Python, each package, module, class, function and method function owns a "namespace" in which variable names are resolved. When a function,  module or package is evaluated (that is, starts execution), a namespace is created. Think of it as an "evaluation context". When ... Read More