Method get

Lib/queue.py:177–215

Remove and return an item from the queue. If optional args 'block' is true and 'timeout' is None (the default), block if necessary until an item is available. If 'timeout' is a non-negative number, it blocks at most 'timeout' seconds and raises the Empty exception if

(self, block=True, timeout=None)

            self.not_empty.notify()

    def get(self, block=True, timeout=None):
        '''Remove and return an item from the queue.

        If optional args 'block' is true and 'timeout' is None (the default),
        block if necessary until an item is available. If 'timeout' is
        a non-negative number, it blocks at most 'timeout' seconds and raises
        the Empty exception if no item was available within that time.
        Otherwise ('block' is false), return an item if one is immediately
        available, else raise the Empty exception ('timeout' is ignored
        in that case).

        Raises ShutDown if the queue has been shut down and is empty,
        or if the queue has been shut down immediately.
        '''
        with self.not_empty:
            if self.is_shutdown and not self._qsize():
                raise ShutDown
            if not block:
                if not self._qsize():
                    raise Empty
            elif timeout is None:
                while not self._qsize():
                    self.not_empty.wait()
                    if self.is_shutdown and not self._qsize():
                        raise ShutDown
            elif timeout < 0:
                raise ValueError("'timeout' must be a non-negative number")
            else:
                endtime = time() + timeout
                while not self._qsize():
                    remaining = endtime - time()
                    if remaining <= 0.0:
                        raise Empty
                    self.not_empty.wait(remaining)
                    if self.is_shutdown and not self._qsize():
                        raise ShutDown
            item = self._get()
            self.not_full.notify()
            return item

    def put_nowait(self, item):
        ''&#x27;Put an item into the queue without blocking.