move_to_tile.py

# given an adjacent tile location, move us there
def move_to_tile(self, location, tile):

  # see where the tile is relative to our current location
  diff = tuple(x-y for x, y in zip(tile, self.location))

  # return the action that moves in the direction of the tile
  if diff == (0,1):
    action = 'u'
  elif diff == (0,-1):
    action = 'd'
  elif diff == (1,0):
    action = 'r'
  elif diff == (-1,0):
    action = 'l'
  else:
    action = ''

  return action