[py-dev] Local import

[Joan Miller]

I'm using the next function to access to the source from tests without
install it (python setup.py develop). It's very usefull during
development so it could be added to py.


------------------------
import os
import sys

def import_local(parent='test', child='lib'):
    """Inserts local library on 'sys.path'.

    Goes up until the root of the project (upper of 'parent' directory)
    and inserts the 'child' directory.
    """
    parent_path = os.path.abspath(os.path.dirname(__file__))

    while parent in os.path.basename(parent_path):
        parent_path = os.path.dirname(parent_path)

    sys.path.insert(0, os.path.join(parent_path, child))
------------------------