kek.py

import sys
import os
import os.path
import random
from os.path import join

inDir = r'C:\kek'

if(input('Input dir is: {}\nIs it correct?(y/n):'.format(inDir)) == 'n'):
    inDir = input('So, write input dir path:')

random.seed()

fl = open(join(inDir, 'log.txt'), 'w')

def f(curPath = inDir):
    for f in os.listdir(curPath):
        if(os.path.isfile( join(curPath, f) ) and f[-4:] == '.mp3'):
            newfn = join(curPath, str(random.randint(0, 1024)) + ' ' + f)
            os.rename(join(curPath, f), newfn)
            # print('rename {}'.format(join(curPath, str(random.randint(0, 1024)) + ' ' + f)))
            fl.write('{}\n'.format(newfn)
        elif(os.path.isdir( join(curPath, f) )):
            f( join(curPath, f) )

f()

fl.close()