Ensure that all Python modules in the specified directory are turned on pep563

ensure_pep563.py

from pathlib import Path


def ensure_pep563(dirpath: Path) -> None:
    self_path = Path(__file__).absolute()
    future_import = "from __future__ import annotations"

    for pypath in dirpath.glob("**/*.py"):
        if pypath.absolute() == self_path:
            continue
        if future_import not in pypath.read_text():
            pypath.write_text(f"{future_import}\n\n" + pypath.read_text())


if __name__ == "__main__":
    import sys

    ensure_pep563(Path(sys.argv[1]))