try to make pylint happy

dav_events/tests/test_converters.py

@@ -1,4 +1,3 @@
-import sys
 import datetime
 from unittest import TestCase
 
@@ -10,7 +9,7 @@ class Iso8601SerializerTestCase(TestCase):
         date = start_date
         while date <= end_date:
             text = '%04d-%02d-%02d' % (date.year, date.month, date.day)
-            yield (date, text)
+            yield date, text
             date += datetime.timedelta(step)
 
     def _gen_times(self, step_hours=1, step_minutes=1, step_seconds=1):
@@ -50,7 +49,7 @@ class Iso8601SerializerTestCase(TestCase):
             '2019-03-01',
         )
         for value in invalid_values:
-            emsg = ('Expected datetime.datetime, datetime.date or datetime.time,' 
+            emsg = ('Expected datetime.datetime, datetime.date or datetime.time,'
                     ' not {}'.format(value.__class__.__name__))
             with self.assertRaisesRegexp(ValueError, emsg):
                 Iso8601Serializer.serialize(value)