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How do you like;
class TestPkg(unittest.TestCase):
 def setUp(self):
 self.root = None
 self.syspath = list(sys.path)
 self.sysmodules = sys.modules.copy()
 def tearDown(self):
 sys.path[:] = self.syspath
 sys.modules.clear()
 sys.modules.update(self.sysmodules)
 del self.sysmodules
 cleanout(self.root)
Or I could use the paranoid approach: create set from sys.modules.keys()
in setUp + tearDown and remove the items that are in the second set but
not in the first set.