Creating a temporary or backup file in Python

backupfile.py

import time
from pathlib import Path

def create_backup_file(file):
    """Create a timestamped, uniquely-named backup version of the received
       file
    """

    while True:
        backup_file_name = "{}.{}.bak".format(file.name,
                                           time.strftime("%Y-%m-%d-%H-%M-%S"))
        backup_file = Path(file.parent) / backup_file_name
        if not backup_file.exists():
            return backup_file
        
    # if os.path.exists(temp_file):
    #     new_temp_file = "{}.{}.tmp".format(
    #         file, time.strftime("%Y-%m-%d-%H-%M-%S"))
    #     os.rename(temp_file, new_temp_file)