def test_lt(self):
        """
        For two instances of L{DelayedCall} C{a} and C{b}, C{a < b} is true
        if and only if C{a} is scheduled to run before C{b}.
        """
        zero, one = self.zero, self.one
        self.assertTrue(zero < one)
        self.assertFalse(one < zero)
        self.assertFalse(zero < zero)
        self.assertFalse(one < one)

        For two instances of L{DelayedCall} C{a} and C{b}, C{a < b} is true
        if and only if C{a} is scheduled to run before C{b}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/test/test_base.py