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How to Build a Dated Backup Filename with Timestamp in Python

Generate unique backup filenames with a timestamp using Python's datetime module and f-strings.

datetime backup filenames
Python 
from datetime import datetime

def build_backup_filename(base_name: str, extension: str = "bak") -> str:
    """Generate a dated backup filename with timestamp."""
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    return f"{base_name}_{timestamp}.{extension}"

if __name__ == "__main__":
    backup_file = bu…
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