add docstring

Author: dlashua

custom_components/pyscript/function.py

@@ -134,6 +134,7 @@ async def event_fire(cls, event_type, **kwargs):
 
     @classmethod
     def store_hass_context(cls, hass_context):
+        """Store a context against the running task."""
         curr_task = asyncio.current_task()
         cls.task2context[curr_task] = hass_context