rename many pdf'S in a directory

[deep_logic]

Hi all,
I'm trying various ways to rename a bunch of pdf's in a directory. I have autocad batch print 50 files to adobe pdf. The problem is the default filename will add "Layout (1) .pdf" at the end of the filename. Just to be tidy, I'd like to remove the "Layout (1) .pdf" and just keep the original file name that autocad has.

This is what I have so far:

###Script to remove Layout (1)
###from the filename that gets
###generated from autocad and
###adobe pdf batch plots - LAME!
###
###deep_logic 02/26/19
###
import os, sys, re, glob

from glob import glob
from os import rename

for fileName in os.listdir(r'c:\\TESTZ'):
    os.rename(fileName, fileName.replace("Layout (1)", "__"))

The filename length does change - that's why it's not as easy as using dict or a variation thereof.

The code doesn't do ANYTHING - it just hangs. So, if anyone could help a coder out...

I'm on python 2.7 and windows 10.

Many thanks