How to use queues
A Python queue is a data structure that implements the first-in-first-out paradigm, basically working like a pipe. You shovel something into the pipe on one side and it falls out on the other side of the pipe.
The main difference between this queue shoveling, and shoveling mud into physical pipes is that, in Python queues, things do not get mixed up. You put one unit in, and that unit comes back out on the other side. Next, you place another unit in (say, for example, an instance of a class), and this entire unit will come back out on the other end as one integral piece.
It comes back out at the other end in the exact order we inserted code into the queue.
Note
A queue is not a stack where we push and pop data. A stack is a last-in-first-out ...
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