tutorial.py

def do_turn(pw):
  # (1) If we currently have a fleet in flight, just do nothing.
  if len(pw.MyFleets()) >= 1:
    return
  # (2) Find my strongest planet.
  source = -1
  source_score = -999999.0
  source_num_ships = 0
  my_planets = pw.MyPlanets()
  for p in my_planets:
    score = float(p.NumShips())
    if score > source_score:
      source_score = score
      source = p.PlanetID()
      source_num_ships = p.NumShips()

  # (3) Find the weakest enemy or neutral planet.
  dest = -1
  dest_score = -999999.0
  not_my_planets = pw.NotMyPlanets()
  for p in not_my_planets:
    score = 1.0 / (1 + p.NumShips())
    if score > dest_score:
      dest_score = score
      dest = p.PlanetID()

  # (4) Send half the ships from my strongest planet to the weakest
  # planet that I do not own.
  if source >= 0 and dest >= 0:
    num_ships = source_num_ships / 2
    pw.IssueOrder(source, dest, num_ships)