old_contents: from . import player
  from . import wall
  
  
  def start(world):
  
      for w, s, e, n in [
          # exterior walls
          (-24, +13, +24, +14), # top
          (-24, -14, +24, -13), # bottom
          (-24, -14, -23, +14), # left
          (+23, -14, +24, +14), # right
          # left home base
          (-17, -5, -16, +5),
          (-18, -6, -16, -5),
          (-18, +5, -16, +6),
          # right home base
          (+16, -5, +17, +5),
          (+16, -6, +18, -5),
          (+16, +5, +18, +6),
          (-10, -1, -6, +1), # left island
          (+6, -1, +10, +1), # right island
          (-1, -10, +1, -6), # bottom island
          (-1, +6, +1, +10), # top island
      ]:
          w *= 16
          s *= 16
          e *= 16
          n *= 16
          world.add(wall.create(w, s, e, n))
  
  
      world.add
      world.add(
          player.create(),
      )
  
  
new_contents: from . import player
  from . import wall
  
  
  def start(world):
  
      for w, s, e, n in [
          # exterior walls
          (-24, +13, +24, +14), # top
          (-24, -14, +24, -13), # bottom
          (-24, -14, -23, +14), # left
          (+23, -14, +24, +14), # right
          # left home base
          (-17, -5, -16, +5),
          (-18, -6, -16, -5),
          (-18, +5, -16, +6),
          # right home base
          (+16, -5, +17, +5),
          (+16, -6, +18, -5),
          (+16, +5, +18, +6),
          (-10, -1, -6, +1), # left island
          (+6, -1, +10, +1), # right island
          (-1, -10, +1, -6), # bottom island
          (-1, +6, +1, +10), # top island
      ]:
          w *= 16
          s *= 16
          e *= 16
          n *= 16
          world.add(wall.create(w, s, e, n))
  
      world.add(
          player.create(),
      )
  
  
subject: remove unused expression typo