code: def _get_path(cls, path, depth, newstep):
          
          parentpath = cls._get_basepath(path, depth - 1)
          key = cls._int2str(newstep)
          return '{0}{1}{2}'.format(
              parentpath,
              cls.alphabet[0] * (cls.steplen - len(key)),
              key
          )
docs: Builds a path given some values
  
          :param path: the base path
          :param depth: the depth of the  node
          :param newstep: the value (integer) of the new step