write_dockerfiles.py

from datetime import date

with open("dockerfile-template", "r") as ff:
    template = ff.read()

python_versions = [(3, 10), (3, 11), (3, 12)]
today = date.today().strftime("%Y%m%d")

for python_major_version, python_minor_version in python_versions:
    key = f"python{python_major_version}{python_minor_version}"
    with open(
        f"v3-dockerfile-test-suite-{key}",
        "w"
    ) as ff:
        ff.write(
            "# This dockerfile is written automatically and should not be "
            "modified by hand.\n\n"
        )
        ff.write(template.format(
            date=today,
            python_major_version=python_major_version,
            python_minor_version=python_minor_version,
        ))