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Issue #16641: Fix default values of sched.scheduler.enter arguments were modifiable.

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This commit is contained in:
Serhiy Storchaka 2012-12-29 21:13:45 +02:00
parent e912496c60
commit c04957bff3
3 changed files with 23 additions and 11 deletions
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8
Lib/sched.py
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@ -50,6 +50,8 @@ class Event(namedtuple('Event', 'time, priority, action, argument, kwargs')):
def __gt__(s, o): return (s.time, s.priority) > (o.time, o.priority)
def __ge__(s, o): return (s.time, s.priority) >= (o.time, o.priority)
_sentinel = object()
class scheduler:
def __init__(self, timefunc=_time, delayfunc=time.sleep):
@ -60,19 +62,21 @@ class scheduler:
self.timefunc = timefunc
self.delayfunc = delayfunc
def enterabs(self, time, priority, action, argument=[], kwargs={}):
def enterabs(self, time, priority, action, argument=(), kwargs=_sentinel):
"""Enter a new event in the queue at an absolute time.
Returns an ID for the event which can be used to remove it,
if necessary.
"""
if kwargs is _sentinel:
kwargs = {}
with self._lock:
event = Event(time, priority, action, argument, kwargs)
heapq.heappush(self._queue, event)
return event # The ID
def enter(self, delay, priority, action, argument=[], kwargs={}):
def enter(self, delay, priority, action, argument=(), kwargs=_sentinel):
"""A variant that specifies the time as a relative time.
This is actually the more commonly used interface.