Decision table generator

decisions.py

import csv
import itertools
import sys


def main():
    reader = csv.reader(sys.stdin, delimiter='\t')
    conditions = {}  # ordered dict is assumed
    for line in reader:
        if not line:
            continue
        condition, *values = line
        conditions[condition] = values

    possible_combinations = itertools.product(*conditions.values())
    transposed = zip(*possible_combinations)
    writer = csv.writer(sys.stdout, delimiter='\t')
    for condition, values in zip(conditions, transposed):
        writer.writerow((condition, *values))


if __name__ == '__main__':
    main()