docs: def addPath(rel_path, prepend=False):
      """ Adds a directory to the system python path, either by append (doesn't
      override default or globally installed package names) or by prepend
      (overrides default/global package names).
      """
      path = lambda *paths: os.path.abspath(
          os.path.join(os.path.dirname(__file__), *paths)) + '/'
      if prepend:
        return sys.path.insert(0, path(rel_path))
      return sys.path.append(path(rel_path))