Why am I getting this error?

[Nathan Longest]

I am attempting to write a script that will take a directory as an argument then go through said directory and rename files with a given extension (in this case .jpg)

here is what I have so far:

import os
fileDir=os.listdir("c:\\Users\\Nathan\\Desktop\\Cell Pics\\")
count = 1
for fn in fileDir:
   
    if fn[-4:] == '.jpg':
        os.rename(fn,'%03i.jpg' % count)
        count += 1

now, when I replace the directory above with '.' and drop the script into the directory I want to affect it will do its job perfectly. However when I have the directory put into the parameter of os.listdir and attempt to run it I get the following error:

Traceback (most recent call last):
  File "C:/Python27/test2.py", line 7, in <module>
    os.rename(fn,'%03i' % count)
WindowsError: [Error 2] The system cannot find the file specified

What am I doing wrong?

I am using windows atm but this script is for UNIX. (if that matters let me know) I am pretty new to scripting and python (first week ever programming) so please be descriptive if at all possible!

thanks in advance!

[bvdet]

Join the path and the file name.

os.path.join("c:\\Users\\Nathan\\Desktop\\Cell Pics\\", fn)