bpo-31454: Include information about "import X as Y" in Modules tutorial (GH-4041)

(cherry picked from commit fbee88244e)

Co-authored-by: Mario Corchero <mariocj89@gmail.com>
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Miss Islington (bot) 2018-02-25 11:35:52 -08:00 committed by GitHub
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@ -112,6 +112,25 @@ Note that in general the practice of importing ``*`` from a module or package is
frowned upon, since it often causes poorly readable code. However, it is okay to
use it to save typing in interactive sessions.
If the module name is followed by :keyword:`as`, then the name
following :keyword:`as` is bound directly to the imported module.
::
>>> import fibo as fib
>>> fib.fib(500)
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377
This is effectively importing the module in the same way that ``import fibo``
will do, with the only difference of it being available as ``fib``.
It can also be used when utilising :keyword:`from` with similar effects::
>>> from fibo import fib as fibonacci
>>> fibonacci(500)
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377
.. note::
For efficiency reasons, each module is only imported once per interpreter