Python for beginners tutorial 19 : Scopes and Namespaces in Python

A namespace is a mapping from names to objects implemented as dictionaries in Python (i.e unique name for each and every object).
Namespaces are created at different moments and have different lifetimes.
A scope is a textual region of a Python program where a namespace is directly accessible.
A lifetime of a namespace depends upon the scope of objects, if the scope of an object ends, the lifetime of the namespace also ends.

We have four types of scopes and namespaces:
Local
Enclosed
Global
Built-in

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