python, get names of files in a directory and then open them code example

Example 1: list of files in python

import os
def fn():       # 1.Get file names from directory
    file_list=os.listdir(r"C:\Users")
    print (file_list)

 #2.To rename files
fn()

Example 2: python get list of files in path

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