Python/other/linear_congruential_generator.py
Christian Clauss 9316e7c014
Set the Python file maximum line length to 88 characters (#2122)
* flake8 --max-line-length=88

* fixup! Format Python code with psf/black push

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
2020-06-16 10:09:19 +02:00

38 lines
1.1 KiB
Python

__author__ = "Tobias Carryer"
from time import time
class LinearCongruentialGenerator:
"""
A pseudorandom number generator.
"""
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
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
if __name__ == "__main__":
# Show the LCG in action.
lcg = LinearCongruentialGenerator(1664525, 1013904223, 2 << 31)
while True:
print(lcg.next_number())