[docs] missing explicit reference to importing module.

Jesse Monroy jesse650 at gmail.com
Tue Sep 4 00:24:30 CEST 2012

In section:
as with many sections it is not mentioned what modules
need to be imported.

If one was to read all the documentation, then one could
presume that using a module means 'import module;'.
This is not the case in many, many scripting languages,
including PERL. So don't be lazy, add to the top of:


import subprocess;

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