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Priority queue with unique items

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This is a very simple Python class for creating priority queues which maintain unique copies of elements.

This is achieved by storing a separate set of elements that have been inserted and checking each time whether the new elements is in that set or not. An optional key parameter allows to specify a function that will be calculated on each element before checking it against the set.

put() will return True if the element was not present in the queue and False otherwise.

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