🟣 Combinateur de mots clés

from itertools import product
import re
import argparse

def combine(expression):
    pattern = re.compile('{%([^}]+?)}')
    swaps = re.findall(pattern, expression)
    tpl = re.sub(pattern,'{}', expression)
    for pr in product(*[read_swaps(swap) for swap in swaps]):
        yield tpl.format(*pr) +'\n'

def read_swaps(swap_file):
    with open(swap_file) as f:
        for line in f:
            yield line.strip('\n')

if __name__ == '__main__':
    parser = argparse.ArgumentParser(prefix_chars='-', description=
                                     """make keyword combination by substituting
                                     in the template file, each {%filename.txt} with the list of
                                     keyword contained in filename.txt and the making the cartesian product.
                                     Example of possible lines :
                                     * Buy {%product.txt} {%color.txt} at the cheapest price
                                     * {%brand.txt} : find the best {%product}""")

    parser.add_argument('tpl_file', help='kewyord_combinator template_file.txt')
    parser.add_argument('-o', '--output', help='change default file output', default='result.txt')
    args = parser.parse_args()

    with open(args.tpl_file) as f_tpl:
        with open(args.output, mode='w') as f_out:
            for line in f_tpl:
                f_out.writelines(combine(line.strip('\n')))