rename.py

import re
import os

folder = os.getcwd()

count = 1
# count increase by 1 in each iteration
# iterate all files from a directory
for file_name in os.listdir(folder):
    # Construct old file name
    source = folder + "\\" + file_name

    # Adding the count to the new file name and extension
    destination = folder + "\\"  + re.sub(r'\[(\d+)\]', r'S01E\1', file_name)


    # Renaming the file
    os.rename(source, destination)
    count += 1
print('All Files Renamed')

print('New Names are')
# verify the result
res = os.listdir(folder)
print(res)