[Python] hash function that outputs integer from 0 to 255?

I need a simple Python hash function to convert a string to an integer from 0 to 255:

>>> hash_function("abc_123")
32
>>> hash_function("any-string-value")
99


It does not matter what the integer is as long as I get the same integer every time I call the function.

I want to use the integer to generate a random subnet mask based on the name of the network.

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