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filename

linear_congruential_generator.py

__author__ = "Tobias Carryer"⏎

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from time import time⏎

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class LinearCongruentialGenerator:⏎

"""⏎

A pseudorandom number generator.⏎

"""⏎

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def __init__(self, multiplier, increment, modulo, seed=int(time())):⏎

"""⏎

These parameters are saved and used when nextNumber() is called.⏎

⏎

modulo is the largest number that can be generated (exclusive). The most⏎

efficient values are powers of 2. 2^32 is a common value.⏎

"""⏎

self.multiplier = multiplier⏎

self.increment = increment⏎

self.modulo = modulo⏎

self.seed = seed⏎

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def next_number(self):⏎

"""⏎

The smallest number that can be generated is zero.⏎

The largest number that can be generated is modulo-1. modulo is set in the constructor.⏎

"""⏎

self.seed = (self.multiplier * self.seed + self.increment) % self.modulo⏎

return self.seed⏎

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if __name__ == "__main__":⏎

# Show the LCG in action.⏎

lcg = LinearCongruentialGenerator(1664525, 1013904223, 2 << 31)⏎

while True:⏎

print(lcg.next_number())⏎