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-rw-r--r--django/utils/timezone.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/utils/timezone.py b/django/utils/timezone.py
index 2107ec96ae..f3eac0e7b2 100644
--- a/django/utils/timezone.py
+++ b/django/utils/timezone.py
@@ -334,7 +334,7 @@ def _is_pytz_zone(tz):
_PYTZ_BASE_CLASSES = (pytz.tzinfo.BaseTzInfo, pytz._FixedOffset)
# In releases prior to 2018.4, pytz.UTC was not a subclass of BaseTzInfo
if not isinstance(pytz.UTC, pytz._FixedOffset):
- _PYTZ_BASE_CLASSES = _PYTZ_BASE_CLASSES + (type(pytz.UTC),)
+ _PYTZ_BASE_CLASSES += (type(pytz.UTC),)
return isinstance(tz, _PYTZ_BASE_CLASSES)