Renames a folder of .png files to be sequential with leading zeros.

rename.py

import os
import pathlib

collection = os.getcwd()
#print(collection)
for i, filename in enumerate(os.listdir(collection)):
    file_extension = pathlib.Path(filename).suffix
    #print("File Extension: ", file_extension)
    if(file_extension == ".png"):
        os.rename(collection +"\\"+ filename, collection +"\\"+ str(i).zfill(4) + ".png")