test_time.py 文件源码

def test_monotonic(self):
        # monotonic() should not go backward
        times = [time.monotonic() for n in range(100)]
        t1 = times[0]
        for t2 in times[1:]:
            self.assertGreaterEqual(t2, t1, "times=%s" % times)
            t1 = t2

        # monotonic() includes time elapsed during a sleep
        t1 = time.monotonic()
        time.sleep(0.5)
        t2 = time.monotonic()
        dt = t2 - t1
        self.assertGreater(t2, t1)
        # Issue #20101: On some Windows machines, dt may be slightly low
        self.assertTrue(0.45 <= dt <= 1.0, dt)

        # monotonic() is a monotonic but non adjustable clock
        info = time.get_clock_info('monotonic')
        self.assertTrue(info.monotonic)
        self.assertFalse(info.adjustable)