Fix test coverage, reverting top level import ptvsd (#28118)

homeassistant/components/ptvsd/__init__.py

@@ -8,7 +8,6 @@ from asyncio import Event
 import logging
 from threading import Thread
 
-import ptvsd
 import voluptuous as vol
 
 from homeassistant.const import CONF_HOST, CONF_PORT
@@ -37,6 +36,12 @@ CONFIG_SCHEMA = vol.Schema(
 
 async def async_setup(hass: HomeAssistantType, config: ConfigType):
     """Set up ptvsd debugger."""
+
+    # This is a local import, since importing this at the top, will cause
+    # ptvsd to hook into `sys.settrace`. So does `coverage` to generate
+    # coverage, resulting in a battle and incomplete code test coverage.
+    import ptvsd  # pylint: disable=import-outside-toplevel
+
     conf = config[DOMAIN]
     host = conf[CONF_HOST]
     port = conf[CONF_PORT]