Python: Archive Old Logs by Compressing Gzip by Age

import gzip
import os
import shutil
from pathlib import Path


def archive_logs(log_dir: str, max_age_days: int) -> list[str]:
    """Compress log files older than max_age_days into .gz archives.
    
    Returns a list of compressed file paths.
    """
    cutoff = time.time() - max_age_days * 86400
    compressed = []
    
    for log_file in Path(log_dir).glob("*.log"):
        if log_file.stat().st_mtime < cutoff:
            gz_path = log_file.with_suffix(".log.gz")
            with log_file.open("rb") as f_in, gzip.open(gz_path, "wb") as f_out:
                shutil.copyfileobj(f_in, f_out)
            log_file.unlink()
            compressed.append(str(gz_path))
    
    return compressed


if __name__ == "__main__":
    import time
    
    # Create sample logs
    test_dir = Path("/tmp/sample_logs")
    test_dir.mkdir(exist_ok=True)
    for name in ["recent.log", "old.log"]:
        path = test_dir / name
        path.write_text("sample log content\n")
    
    # Make old.log 10 days old
    old_ts = time.time() - 10 * 86400
    os.utime(test_dir / "old.log", (old_ts, old_ts))
    
    result = archive_logs(str(test_dir), max_age_days=7)
    print(f"Compressed: {result}")
    print(f"Remaining files: {sorted(p.name for p in test_dir.iterdir())}")