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motivation.rst add real problem to answer why #42

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motivation.rst add real problem to answer why
techtonik Jun 21, 2016
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techtonik Jun 28, 2016
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24 changes: 17 additions & 7 deletions motivation.rst
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Why mingwpy?
############

Python.org distributes binary installers for Python that are built with
:term:`MSVS`.

It is possible to install a version of MSVS that will build Python extensions
written in C.

So |--| why do we need mingwpy?
Python extensions for Windows should be compiled with the version of
:term:`MSVS` that was used to compile Python itself. The problem is that for
every Python this version is different.

========== ======================
Python 2.7 Visual C++ 2008 (9.0)
---------- ----------------------
Python 3.3 Visual C++ 2010 (10.0)
---------- ----------------------
Python 3.4 Visual C++ 2010 (10.0)
---------- ----------------------
Python 3.5 Visual C++ 2015 (14.0)
========== ======================

So to build extension for 2.7, 3.4 and 3.5 you need to install 3
different compilers. For other Python versions see the full list at
http://matthew-brett.github.io/pydagogue/python_msvc.html

********************************************
MSVS can be painful to install and configure
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