How to create a file one directory up?

Question

How can I create a file in python one directory up, without using the full path?

I would like a way that worked both for windows and linux.

Thanks.

Answer 1

Use os.pardir (which is probably always "..")

import os
fobj = open(os.path.join(os.pardir, "filename"), "w")

Answer 2

People don't seem to realize this, but Python is happy to accept forward slash even on Windows. This works fine on all platforms:

fobj = open("../filename", "w")