docs: def generate_py_units(data):
    """Generate the list of units in units.py."""
    units = collections.defaultdict(list)
    for unit in sorted(data.units, key=lambda a: a.name):
      if unit.unit_id in static_data.UNIT_TYPES:
        units[unit.race].append(unit)
  
    def print_race(name, race):
      print("class %s(enum.IntEnum):" % name)
      print('  """%s units."""' % name)
      for unit in units[race]:
        print("  %s = %s" % (unit.name, unit.unit_id))
      print("\n")
  
    print_race("Neutral", sc_common.NoRace)
    print_race("Protoss", sc_common.Protoss)
    print_race("Terran", sc_common.Terran)
    print_race("Zerg", sc_common.Zerg)