Working with OS module in Python

import os

def soldier(a,b,c):
    os.chdir(a)
    i = 1
    items = os.listdir(a)
    for item in items:
        if item.endswith(b):
            os.rename(item, item.capitalize())

        if item.endswith(c):
            os.rename(item, f"{i}.{c}")
            i += 1

fpath = r"D:\abdur codes\space\thisisit\fffffffffffffffff"
filename = ".py"
format = ".png"

soldier(fpath, filename, format)

######################################################################

import os

def soldier(fpath, filename, format):
    os.chdir(fpath)
    i = 1
    files = os.listdir(fpath)
    with open(filename) as f:  # this file contains files names which we will not tamper with
        filelist = f.read().split("\n")

    for file in files:
        if file not in filelist:
            os.rename(file, file.capitalize())

        # if os.splitext(fpath)[1]==format:
        if os.path.splitext(file)[1] == format: # splitext() function splits a file into its name and its extension
            os.rename(file, f"{i}.{format}")
            i += 1

fpath = r"D:\abdur codes\space\thisisit\fffffffffffffffff"
filename = r"D:\abdur codes\space\thisisit\fffffffffffffffff\nothis.txt"
format = ".png"

soldier(fpath, filename, format)

################# The End ###########################

Python