Finding python tree root

gistfile1.txt

import os
import sys

possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                   os.pardir,
                                   os.pardir))
if os.path.exists(os.path.join(possible_topdir, '<project name>', '__init__.py')):
    sys.path.insert(0, possible_topdir)