Let _all_timezones_unchecked be garbage collected when no longer needed

stub42 · Dec 18, 2022 · 8656870 · 8656870
1 parent bd3e51f
commit 8656870
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/pytz/__init__.py b/src/pytz/__init__.py
@@ -202,7 +202,9 @@ def _case_insensitive_zone_lookup(zone):
     """case-insensitively matching timezone, else return zone unchanged"""
     global _all_timezones_lower_to_standard
     if _all_timezones_lower_to_standard is None:
+        global _all_timezones_unchecked
         _all_timezones_lower_to_standard = dict((tz.lower(), tz) for tz in _all_timezones_unchecked)  # noqa
+        del _all_timezones_unchecked
     return _all_timezones_lower_to_standard.get(zone.lower()) or zone  # noqa