DIVSPL interpreter in Python 3

divspl.py

#!/usr/bin/env nix-shell
#! nix-shell -i python3 -p python3

import sys

# This is a basic interpreter for DIVSPL, as described at
# https://www.promptworks.com/blog/the-fastest-fizzbuzz-in-the-west

def parseAssignment(line):
    word, number = [w.strip() for w in line.rsplit("=", 1)]
    return word, int(number)

def parse(lines):
    # The first line must be the range.
    start, stop = [int(n.strip()) for n in next(lines).split("...")]
    assignments = [parseAssignment(line) for line in lines]
    return start, stop, assignments

def run(start, stop, assignments):
    for i in range(start, stop + 1):
        s = [w for w, n in assignments if not i % n]
        yield "".join(s) if s else str(i)

# NB: programs should already be split into lines
def main(program):
    start, stop, assignments = parse(program)
    for line in run(start, stop, assignments):
        print(line)
    return 0

if __name__ == "__main__":
    sys.exit(main(sys.stdin))

fizzbuzz.divspl

1...15
fizz=3
buzz=5

fizzbuzzfuzz.divspl

1...105
fizz=3
buzz=5
fuzz=7