[Tutor] Removing files based upon time stamps

[Lie Ryan]

I'm not sure what caused your problem, but...

> os.chdir("c:\BACKUPS\DEV1")

This is a no-no. What if you have a path like this:
'C:\nice\try'

what do you think would python be doing?
It would parse \n as newline and \t as tab

You should do this instead:
r'C:\nice\try'
OR
'C:\\nice\\try'

the first way is called raw string, the backslash lose its meaning
the second way is by escaping the backslash.