Move SmartThings imports to top (#24878)

* Move imports to top

* use lib constants

* Add missing three_axis mapping

homeassistant/components/smartthings/__init__.py

@@ -6,6 +6,8 @@ from typing import Iterable
 
 from aiohttp.client_exceptions import (
     ClientConnectionError, ClientResponseError)
+from pysmartapp.event import EVENT_TYPE_DEVICE
+from pysmartthings import Attribute, Capability, SmartThings
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_ACCESS_TOKEN
@@ -60,8 +62,6 @@ async def async_migrate_entry(hass: HomeAssistantType, entry: ConfigEntry):
 
 async def async_setup_entry(hass: HomeAssistantType, entry: ConfigEntry):
     """Initialize config entry which represents an installed SmartApp."""
-    from pysmartthings import SmartThings
-
     if not validate_webhook_requirements(hass):
         _LOGGER.warning("The 'base_url' of the 'http' component must be "
                         "configured and start with 'https://'")
@@ -179,8 +179,6 @@ async def async_unload_entry(hass: HomeAssistantType, entry: ConfigEntry):
 async def async_remove_entry(
         hass: HomeAssistantType, entry: ConfigEntry) -> None:
     """Perform clean-up when entry is being removed."""
-    from pysmartthings import SmartThings
-
     api = SmartThings(async_get_clientsession(hass),
                       entry.data[CONF_ACCESS_TOKEN])
 
@@ -301,9 +299,6 @@ class DeviceBroker:
 
     async def _event_handler(self, req, resp, app):
         """Broker for incoming events."""
-        from pysmartapp.event import EVENT_TYPE_DEVICE
-        from pysmartthings import Capability, Attribute
-
         # Do not process events received from a different installed app
         # under the same parent SmartApp (valid use-scenario)
         if req.installed_app_id != self._installed_app_id: