Get A List Of Changed Files Between Two Commits Or Branches

I'm a Python/Git newb but I'm trying to write a script that takes two branches or commits as parameters and shows a list of changed files between the two, not all the extraneous in

Solution 1:

Fixed or at least on the right track with the following (inspired by someone who deleted their answer... thanks, guy)

subprocess.check_output(['git', 'diff', '--name-only', currentBranch + '..' + compBranch])

This basically does what I need it to, although if there is a more elegant solution I'd love to hear it!