queue.py

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import collections
 
from ..packages import six
from ..packages.six.moves import queue
 
if six.PY2:
    # Queue is imported for side effects on MS Windows. See issue #229.
    import Queue as _unused_module_Queue  # noqa: F401
 
 
class LifoQueue(queue.Queue):
    def _init(self, _):
        self.queue = collections.deque()
 
    def _qsize(self, len=len):
        return len(self.queue)
 
    def _put(self, item):
        self.queue.append(item)
 
    def _get(self):
        return self.queue.pop()