tomllib: Add a comment about implicit lru_cache bound (pythonGH-126078)

lysnikolaou · Oct 29, 2024 · 67f5c5b · 67f5c5b
1 parent a64a1c9
commit 67f5c5b
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/Lib/tomllib/_re.py b/Lib/tomllib/_re.py
@@ -84,6 +84,9 @@ def match_to_datetime(match: re.Match) -> datetime | date:
     return datetime(year, month, day, hour, minute, sec, micros, tzinfo=tz)
 
 
+# No need to limit cache size. This is only ever called on input
+# that matched RE_DATETIME, so there is an implicit bound of
+# 24 (hours) * 60 (minutes) * 2 (offset direction) = 2880.
 @lru_cache(maxsize=None)
 def cached_tz(hour_str: str, minute_str: str, sign_str: str) -> timezone:
     sign = 1 if sign_str == "+" else -1