Python comes with a regression test suite but there's currently not a specific case for just running the tests that are expected to pass on Haiku.  We need to have just the tests that currently pass on Haiku added to this test.  The current status of Python on Haiku can be seen here:

http://ports.haiku-files.org/wiki/PythonRegressionTests

You will most likely have to modify Lib/test/regrtest.py to adjust the test cases for Haiku.

You can install Python-2.6.6 on Haiku using "installoptionalpackage Python" in the terminal.