Queue
The Queue module implements a multi-producer, multi-consumer
FIFO queue. It is especially useful in threads programming when
information must be exchanged safely between multiple threads. The
Queue class in this module implements all the required locking
semantics. It depends on the availability of thread support in
Python.
The Queue module defines the following exception:
get_nowait()) is
called on a Queue object which is empty, or for which the emptyiness
cannot be determined (i.e. because the appropriate locks cannot be
acquired).