[docs] [issue22725] improve documentation for enumerate() (built-in function)

[Raymond Hettinger]

Raymond Hettinger added the comment:

Can you attach a proposed patch and I will make a decision.  

FWIW, I'm very happy with the current documentation at https://docs.python.org/2.7/library/functions.html#enumerate  Between the text, example, and pure python equivalent, it does a great job communicating what enumerate is supposed to do.

Proposed improvements to the docstring should match the main documentation as much as possible.

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<http://bugs.python.org/issue22725>
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