A context manager which changes the working directory to the given path, and then changes it back to its previous value on exit.

working_directory.py

@contextlib.contextmanager
def working_directory(path):
    """
    A context manager which changes the working directory to the given
    path, and then changes it back to its previous value on exit.
    Original by Greg Warner:
    http://code.activestate.com/recipes/576620-changedirectory-context-manager/#c3
    """
    prev_cwd = os.getcwd()
    os.chdir(path)
    try:
        yield
    finally:
        os.chdir(prev_cwd)