code: def _food_left(self):
      return np.sum(self.maze == Element.FOOD_PELLET)
  
imports: import logging
  from typing import NamedTuple
  import numpy
  from gym import Env
  from gym.spaces import Box, Discrete
label_desc: Use image node_id 13 for calling the PocManEnv obj's underlying member method code with example usage: obj._food_left() and returns: np