Python Queue.Queue.get Method

Question

In the python documentation, it says

exception Queue.Empty
Exception raised when non-blocking get() (or get_nowait()) is called on a Queue object which is empty.

So I wonder whether the following coding will ever raise the Queue.Empty exception because the way it use 'get' method seems non-blocking.

Here is the code.

try:
    request = self._requests_queue.get(True, self._poll_timeout)
except Queue.Empty:
    continue

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

The documentation says everything you need to know to answer the question (emphasis mine):

Queue.get([block[, timeout]])

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 positive 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).

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Dec 27, 2013 at 10:27

NPE

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