py: unittests.py: Fix type checker warnings

Fix type checker warnings by dropping unused imports and using _ for
variable names that are not used.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

test/py/unittests.py

@@ -4,11 +4,9 @@
 # Copyright (C) 2022, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
 
 from collections import defaultdict
-import errno
 import gc
 import libcamera as libcam
 import selectors
-import time
 import typing
 import unittest
 import weakref
@@ -282,7 +280,7 @@ class SimpleCaptureMethods(CameraTesterBase):
         running = True
         while running:
             events = sel.select()
-            for key, _ in events:
+            for _ in events:
                 ready_reqs = cm.get_ready_requests()
 
                 reqs += ready_reqs