test.py

import sys
from os import *

userpath = sys.argv[1]

def validates_path(fpath): #valida o caminho até o diretório
    if (path.exists(fpath) == False) or (path.isdir(fpath) == False):
        fpath = str(input("Error! Insert a valid path: "))
        validates_path(fpath)
    return True

validates_path(userpath)
command0 ='cd ' + userpath
system(command0)
archives = listdir(userpath)

confirmation = input("You entered the path:\n" + userpath + ".\nAre you sure you want to proceed (y/N)?: ")

if confirmation in ['y', 'Y']:
    for archive in archives:
        archive_path = userpath + '/' + archive
        new_archive_path = userpath + '/file_' + archive
        system('mv ' + archive_path + ' ' + new_archive_path)
else:
    print("End process.")