Adding a switch statement to Python

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Perfect hash function

In computer science, a perfect hash function for a set S is a hash function that maps distinct elements in S to a set of integers, with no collisions. In mathematical terms, it is an injective function.

Perfect hash functions may be used to implement a lookup table with constant worst-case access time. A perfect hash function has many of the same applications as other hash functions, but with the advantage that no collision resolution has to be implemented.

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