python change file names in a directory code example

Example 1: python rename file

import os  
os.rename('guru99.txt','career.guru99.txt')

Example 2: rename file python

import os  
os.rename('old_name.txt','new_name.txt')

Example 3: get file names in folder python

from os import listdir
from os.path import isfile, join
onlyfiles = [f for f in listdir(mypath) if isfile(join(mypath, f))]