[AI] Rename building type base class and use it for annotation (#4014)

default/python/AI/ProductionAI.py

@@ -24,7 +24,7 @@
 import PriorityAI
 from AIDependencies import INVALID_ID, Tags
 from aistate_interface import get_aistate
-from buildings import BuildingType, Shipyard, get_empire_drydocks
+from buildings import BuildingType, BuildingTypeBase, Shipyard, get_empire_drydocks
 from character.character_module import Aggression
 from colonization import rate_planetary_piloting
 from colonization.rate_pilots import GREAT_PILOT_RATING
@@ -1443,7 +1443,7 @@ def _location_rating(planet: fo.planet) -> float:
 
 
 def _try_enqueue(
-    building_type: BuildingType,
+    building_type: BuildingTypeBase,
     candidates: Union[PlanetId, Iterable[PlanetId]],
     *,
     at_front: bool = False,
@@ -1486,7 +1486,7 @@ def _try_enqueue(
     return 0.0
 
 
-def _may_enqueue_for_stability(building_type: BuildingType, new_turn_cost: float) -> float:
+def _may_enqueue_for_stability(building_type: BuildingTypeBase, new_turn_cost: float) -> float:
     """
     Build building if it seems worth doing so to increase stability.
     Only builds of locations.planets_enqueued is empty and new_turn_cost is 0.0,

default/python/AI/buildings.py

@@ -44,7 +44,7 @@ def get_empire_drydocks() -> Mapping[SystemId, Tuple[PlanetId]]:
     return ReadOnlyDict({k: tuple(v) for k, v in drydocks.items()})
 
 
-class _BuildingOperations:
+class BuildingTypeBase:
     """
     Mixin class for building enums.
 
@@ -151,7 +151,7 @@ def prerequisite(self):  # not yet. -> Optional[BuildingType]:
         return _prerequisites.get(self, None)
 
 
-class BuildingType(_BuildingOperations, Enum):
+class BuildingType(BuildingTypeBase, Enum):
     """
     Represent basic buildings.
 
@@ -190,7 +190,7 @@ class BuildingType(_BuildingOperations, Enum):
     XENORESURRECTION_LAB = "BLD_XENORESURRECTION_LAB"
 
 
-class Shipyard(_BuildingOperations, Enum):
+class Shipyard(BuildingTypeBase, Enum):
     """
     Represent buildings required to build ships.
     """