Simple Python script to rename all files in a directory

rename.py

# -*- coding: utf-8 -*-
"""
Created on Tuesday Nov 13
This script is to rename all files in a directory according to a pattern without changing file extension
@author: Rex Low
@github: rexlow
"""

import os

def rename(fdir, startIdx):
    i = startIdx
    for _, f in enumerate(os.listdir(fdir)):
        if f.lower().endswith((".jpg", ".png", ".jpeg")):
            src = os.path.join(fdir, f)
            dst = os.path.join(fdir, "plate{}{}".format(i, os.path.splitext(f)[1]))
            os.rename(src, dst)
            i += 1

rename("/Users/rex/Desktop/images/crawl", 428)