Python Shuffle Then Rename Files

Need to randomize order of tens of thousands of images then rename sequentially.

Steps:

1. Shuffle directory file list.
2. Rename temporarily with random timestamps to break original ordering.
3. List again and assign zero-padded incremental names.

import os, random, time
def rename():
    filetype = '.png'  # target extension
    filename = ''      # prefix
    zfillNum = 5       # digits
    path = r"C:\\Users\\xxxx\\Desktop\\test"
    i = 0
    filelist = os.listdir(path)
    random.shuffle(filelist)
    for files in filelist:
        Olddir = os.path.join(path, files)
        if os.path.isdir(Olddir):
            continue
        filenameRes = str(int(time.time())+random.randint(1000000,88888888))
        Newdir = os.path.join(path, filenameRes + filetype)
        os.rename(Olddir, Newdir)
    filelist = os.listdir(path)
    for files in filelist:
        i += 1
        Olddir = os.path.join(path, files)
        if os.path.isdir(Olddir):
            continue
        filenameNum = str(i).zfill(zfillNum)
        filenameRes = filename+filenameNum
        Newdir = os.path.join(path, filenameRes + filetype)
        os.rename(Olddir, Newdir)
    return True

if __name__ == '__main__':
    rename()