Python test framework that supports functional/integration testing

Is there a python (or generic) test framework that supports functional/integration testing?

I looked at the python frameworks listed in wikipedia but none of them look like they support functional testing. What I'm trying to do is run our python program against a list of input. When the program outputs the results, I want to either diff against an expected results file or do some regex to verify the output is what I'm expecting it to be.

Are there any suggestions on frameworks to use/look at or should I build something on my own to do this?