A heap is a special type of tree-based data structure. Queues are efficient in Python because they are implemented as heaps. They are also the best choice for evaluating mathematical expressions, because of the importance of order of operations. In programming, most compilers extensively use stacks. When more stock is necessary, the top items are removed first. New supplies are placed on top of older orders. For instance, stacks are used to store and retrieve non-perishable supplies. Stacks are less obvious in day-to-day life, but are used whenever efficiency is preferred over strict fairness. The most recent item to arrive is always the next item to be selected. A stack is also a list-based data structure, but it uses a last in first out (LIFO) scheme. The next item to arrive would be added to the end of the queue, following E. Item D is at the front and would be the next scheduled item, followed by E. Items B and C are retrieved because they occupy the first two positions of the queue.
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