gistfile1.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from os import path, environ
from subprocess import check_output, call
from shlex import split
from codecs import open

home_dir = environ['HOME']
python_path = u'''
export PYTHONPATH=/Library/Python/2.7/site-packages:$PYTHONPATH
export PYTHONPATH=/(pipでのインストール先のパス)/site-packages:$PYTHONPATH
'''


if call(split('which brew')) == 0:
    brew_prefix = unicode(check_output(split('brew --prefix')))
    brew_python_path = u''.join([u'export PYTHONPATH=',
                                brew_prefix.replace(u'\n', u''),
                                u'/lib/python2.7/site-packages:$PYTHONPATH'])
    python_path = u''.join([python_path, brew_python_path])


def main():
    fpath = path.join(home_dir, 'dummy.sh')
    with open(fpath, 'a', encoding='utf-8') as f:
        f.write(python_path)


if __name__ == '__main__':
    main()

Python2ツラい