Python : How to rename all files in a folder so that their names are ordered numbers?

RenameAllFilesInFolderToBeNumerical.py

import os

def get_list_of_files_only_in_folder(folder_path):
    return [f for f in os.listdir(folder_path) if os.path.isfile(os.path.join(folder_path, f))]

def get_extension(name):
    return name.split('.')[-1]

def rename_files_in_folder_to_numerical_order(path, start_index = 0):
    n = start_index;
    for i in get_list_of_files_only_in_folder(path):
        old_path_to_file = path +"//"+ i
        new_path_to_file = path + "//" + str(n) +"."+ get_extension(i)
        os.rename(old_path_to_file, new_path_to_file)
        n += 1

rename_files_in_folder_to_numerical_order("C://Users//X//Desktop//X//B", 0)
#Rename all files in folder so that thair names are ordered numbers.