Raymond Hettinger added the comment:
It may seem pointless to hold the lock, but it is guaranteed behavior (and has
been so for a very, very long time).
'''
# Override these methods to implement other queue organizations
# (e.g. stack or priority queue).
# These will only be called with appropriate locks held
# Initialize the queue representation
def _init(self, maxsize):
self.queue = deque()
def _qsize(self):
return len(self.queue)
# Put a new item in the queue
def _put(self, item):
self.queue.append(item)
# Get an item from the queue
def _get(self):
return self.queue.popleft()
'''
----------
versions: -Python 3.5
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