Renaming Serial Files

## When downloaded some serials have long names like DareDevil.S02.E09
## This program removes the statring Daredevil.S02. from the filename as it is already there on the folder.

import os

folder_path = "D:\\marvel daredevil\\"
file_extension = ".mp4"
episode_number_at_index = 2

for file in os.listdir(folder_path):
    name_array = file.split(".")
    os.rename(folder_path + file, folder_path + episode_number_at_index + file_extension)