docs:python:install [hartungdesign.net wiki]

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====== python install ======

===== python on windows =====
  * download python 2.7.x windows installer from https://www.python.org/
  * download psycopg2 windows installer from http://initd.org/psycopg/

===== python on mac =====
  * python was already installed on mac, but it was Apple's version
  * installed macports version of python<code>
# to change to macports python...
sudo port select --set python python27

# to change back...
sudo port select --set python python27-apple
</code>

<note>
psycopg2 and mysql drivers were easily installed with macports using these commands:
<code>
sudo port install py27-psycopg2
sudo port install py27-mysql
</code>

however, for the following items, pip was used with apple python to learn how it works; each of these were available on macports and could easily be installed from there
</note>

===== pip and postgres driver =====
  * install pip and psycopg2
  * pip is a package manager for python 
  * download get-pip.py from https://pip.pypa.io/en/latest/installing.html<code>
sudo python ~/Downloads/get-pip.py
</code>
  * ''sudo pip install psycopg2'' failed because it couldn't find pg_config
  * postgres was already installed with macports, so I modified the path<code>
export PATH=$PATH:/opt/local/lib/postgresql93/bin
</code>
  * this now worked<code>
sudo pip install psycopg2
</code>

===== sqlite =====
  * sqlite3 is installed by default with python

===== mysql =====
  * mysql was already installed with macports, so I modified the path<code>
export PATH=$PATH:/opt/local/lib/mysql55/bin
</code>
  * this now worked<code>
sudo pip install MySQL-python
</code>

===== view installed modules =====
  * ''python'' (starts an interactive python shell)
  * ''help('modules')''