Simple script to rename zip volumes to end with .zip and also to revert the change.

rename_zip_volumes.py

import os
import re

exp = re.compile("\.zip\.\d+")
for file_name in os.listdir("./"):
    if exp.search(file_name): 
        if not file_name.endswith(".zip"):
            print("Renaming " + file_name + " to " + file_name + ".zip")
            os.rename(file_name, file_name + ".zip")
        else:
            print("Restoring zip file " + file_name[0:-4])
            os.rename(file_name, file_name[0:-4])