Migrate legacy typehints in core to PEP-526 (#26403)

* Migrate legacy typehints in core to PEP-526

* Fix one type

homeassistant/core.py

@@ -17,7 +17,7 @@ from time import monotonic
 import uuid
 
 from types import MappingProxyType
-from typing import (  # noqa: F401 pylint: disable=unused-import
+from typing import (
     Optional,
     Any,
     Callable,
@@ -28,7 +28,6 @@ from typing import (  # noqa: F401 pylint: disable=unused-import
     Set,
     TYPE_CHECKING,
     Awaitable,
-    Iterator,
 )
 
 from async_timeout import timeout
@@ -170,10 +169,10 @@ class HomeAssistant:
         """Initialize new Home Assistant object."""
         self.loop: asyncio.events.AbstractEventLoop = (loop or asyncio.get_event_loop())
 
-        executor_opts = {
+        executor_opts: Dict[str, Any] = {
             "max_workers": None,
             "thread_name_prefix": "SyncWorker",
-        }  # type: Dict[str, Any]
+        }
 
         self.executor = ThreadPoolExecutor(**executor_opts)
         self.loop.set_default_executor(self.executor)
@@ -733,7 +732,7 @@ class State:
             )
 
         self.entity_id = entity_id.lower()
-        self.state = state  # type: str
+        self.state: str = state
         self.attributes = MappingProxyType(attributes or {})
         self.last_updated = last_updated or dt_util.utcnow()
         self.last_changed = last_changed or self.last_updated
@@ -836,7 +835,7 @@ class StateMachine:
 
     def __init__(self, bus: EventBus, loop: asyncio.events.AbstractEventLoop) -> None:
         """Initialize state machine."""
-        self._states = {}  # type: Dict[str, State]
+        self._states: Dict[str, State] = {}
         self._bus = bus
         self._loop = loop
 
@@ -1050,7 +1049,7 @@ class ServiceRegistry:
 
     def __init__(self, hass: HomeAssistant) -> None:
         """Initialize a service registry."""
-        self._services = {}  # type: Dict[str, Dict[str, Service]]
+        self._services: Dict[str, Dict[str, Service]] = {}
         self._hass = hass
 
     @property
@@ -1269,29 +1268,29 @@ class Config:
         """Initialize a new config object."""
         self.hass = hass
 
-        self.latitude = 0  # type: float
-        self.longitude = 0  # type: float
-        self.elevation = 0  # type: int
-        self.location_name = "Home"  # type: str
-        self.time_zone = dt_util.UTC  # type: datetime.tzinfo
-        self.units = METRIC_SYSTEM  # type: UnitSystem
+        self.latitude: float = 0
+        self.longitude: float = 0
+        self.elevation: int = 0
+        self.location_name: str = "Home"
+        self.time_zone: datetime.tzinfo = dt_util.UTC
+        self.units: UnitSystem = METRIC_SYSTEM
 
-        self.config_source = "default"  # type: str
+        self.config_source: str = "default"
 
         # If True, pip install is skipped for requirements on startup
-        self.skip_pip = False  # type: bool
+        self.skip_pip: bool = False
 
         # List of loaded components
-        self.components = set()  # type: set
+        self.components: set = set()
 
         # API (HTTP) server configuration, see components.http.ApiConfig
-        self.api = None  # type: Optional[Any]
+        self.api: Optional[Any] = None
 
         # Directory that holds the configuration
-        self.config_dir = None  # type: Optional[str]
+        self.config_dir: Optional[str] = None
 
         # List of allowed external dirs to access
-        self.whitelist_external_dirs = set()  # type: Set[str]
+        self.whitelist_external_dirs: Set[str] = set()
 
     def distance(self, lat: float, lon: float) -> Optional[float]:
         """Calculate distance from Home Assistant.