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Issue #6478: _strptime's regexp cache now is reset after changing timezone

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with time.tzset().
This commit is contained in:
Serhiy Storchaka 2015-12-03 22:26:36 +02:00
commit b1f64e7d29
3 changed files with 50 additions and 15 deletions
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22
Lib/_strptime.py
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@ -77,6 +77,8 @@ class LocaleTime(object):
self.__calc_date_time()
if _getlang() != self.lang:
raise ValueError("locale changed during initialization")
if time.tzname != self.tzname or time.daylight != self.daylight:
raise ValueError("timezone changed during initialization")
def __pad(self, seq, front):
# Add '' to seq to either the front (is True), else the back.
@ -161,15 +163,17 @@ class LocaleTime(object):
def __calc_timezone(self):
# Set self.timezone by using time.tzname.
# Do not worry about possibility of time.tzname[0] == timetzname[1]
# and time.daylight; handle that in strptime .
# Do not worry about possibility of time.tzname[0] == time.tzname[1]
# and time.daylight; handle that in strptime.
try:
time.tzset()
except AttributeError:
pass
no_saving = frozenset({"utc", "gmt", time.tzname[0].lower()})
if time.daylight:
has_saving = frozenset({time.tzname[1].lower()})
self.tzname = time.tzname
self.daylight = time.daylight
no_saving = frozenset({"utc", "gmt", self.tzname[0].lower()})
if self.daylight:
has_saving = frozenset({self.tzname[1].lower()})
else:
has_saving = frozenset()
self.timezone = (no_saving, has_saving)
@ -307,13 +311,15 @@ def _strptime(data_string, format="%a %b %d %H:%M:%S %Y"):
global _TimeRE_cache, _regex_cache
with _cache_lock:
if _getlang() != _TimeRE_cache.locale_time.lang:
locale_time = _TimeRE_cache.locale_time
if (_getlang() != locale_time.lang or
time.tzname != locale_time.tzname or
time.daylight != locale_time.daylight):
_TimeRE_cache = TimeRE()
_regex_cache.clear()
locale_time = _TimeRE_cache.locale_time
if len(_regex_cache) > _CACHE_MAX_SIZE:
_regex_cache.clear()
locale_time = _TimeRE_cache.locale_time
format_regex = _regex_cache.get(format)
if not format_regex:
try: