Notes on setting pyenv and python environment using Homebrew on Mac OS Marvericks

python version control tool (pyenv) setup

Set up pyenv, a tool that allows you to install various Python versions and implementations in parallel, such as CPython 2.7 and 3.3, jython and pypy.

$ brew install pyenv-virtualenv pyenv

Also install pyenv-pip-rehash, which also rehashes.

$ git clone https://github.com/yyuu/pyenv-pip-rehash.git ~/.pyenv/plugins/pyenv-pip-rehash

Describe in the configuration file (.bashrc, .zshrc, etc) corresponding to your login shell according to the following

.zshrc

To enable shims and autocompletion add to your profile:
  if which pyenv > /dev/null; then eval "$(pyenv init -)"; fi

To use Homebrew's directories rather than ~/.pyenv add to your profile:
  export PYENV_ROOT=/usr/local/opt/pyenv

View a list of installable versions and implementations

$ pyenv install -l
Available versions:
  2.4
  2.4.1
  2.4.2
  2.4.3
  2.4.4
  2.4.5
  2.4.6

...abridgement...

  pypy-2.0-src
  pypy-2.0.1
  pypy-2.0.1-src
  pypy-2.0.2
  pypy-2.0.2-src
  pypy-2.1
  pypy-2.1-src
  pypy-2.2
  pypy-2.2-src
  pypy-2.2.1
  pypy-2.2.1-src
  pypy-dev
  pypy3-2.1-beta1
  pypy3-2.1-beta1-src
  pypy3-dev
  stackless-2.7-dev
  stackless-2.7.2
  stackless-3.2-dev
  stackless-3.2.2
  stackless-3.3-dev
  stackless-dev

python installation

$ pyenv install 2.7.6
$ pyenv install 3.3.3
$ pyenv install pypy-2.2.1

Check the setting result

$ pyenv versions
* system (set by /Users/tstomoki/.pyenv/version)
  2.7.6
  3.3.3

Version switching

####Switch current shell version
$ pyenv shell 2.7.6
#Switch version of current directory
$ pyenv local 2.7.6
#Overall version switching
$ pyenv global 2.7.6

Installation of each package

I would like to install numpy, scipy, matplotlib, etc., which are mainly used for data analysis.

Also install gfortran for scripy

 $ brew install gfortran
 $ pip install numpy
 $ pip install yamlog
 $ pip install scipy
 $ pip install matplotlib

In the middle

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 46: ordinal not in range(128)

I got the error, but I solved it with this page. (Write the following in ~ / .pyenv / versions / 2.7.6 / lib / python2.7 / site-packages / sitecustomize.py)

sitecustomize.py

import sys
sys.setdefaultencoding('utf-8')

Also, I got the error "/System/Library/Frameworks/vecLib.framework/Headers/vBasicOps.h:153:23: error: immintrin.h: No such file or directory" and scipy installation failed [this page] From](https://github.com/scipy/scipy/issues/3194) It was solved by exporting the following. It seems that it was a problem with the Xcode header.

$ export CC=clang
$ export CXX=clang
$ export FFLAGS=-ff2c

I got angry when installing matplotlib, so on this page (http://stackoverflow.com/questions/20572366/sudo-pip-install-matplotlib-fails-to-find-freetype-headers-os-x-mavericks) I put a link of freetype2 like this.

$ ln -s /usr/local/opt/freetype/include/freetype2 /usr/local/include/freetype

Operation check

Creating a test file

test.py

from pylab import *
t = arange(0.0, 2.0, 0.01)
s = sin(2*pi*t)
plot(t, s, linewidth=1.0)
xlabel('time (s)')
ylabel('voltage (mV)')
title('About as simple as it gets, folks')
grid(True)
savefig("test.png ")
show()

Run

$ python test.py

If the sine curve is output, the installation of python and pip is complete.

Reference material

-Put matplotlib in Mac mountain lion