Python timedelta.resolution方法代码示例

# 需要导入模块: from datetime import timedelta [as 别名]
# 或者: from datetime.timedelta import resolution [as 别名]
def test_overflow(self):
        tiny = timedelta.resolution

        td = timedelta.min + tiny
        td -= tiny  # no problem
        self.assertRaises(OverflowError, td.__sub__, tiny)
        self.assertRaises(OverflowError, td.__add__, -tiny)

        td = timedelta.max - tiny
        td += tiny  # no problem
        self.assertRaises(OverflowError, td.__add__, tiny)
        self.assertRaises(OverflowError, td.__sub__, -tiny)

        self.assertRaises(OverflowError, lambda: -timedelta.max)

        day = timedelta(1)
        self.assertRaises(OverflowError, day.__mul__, 10**9)
        self.assertRaises(OverflowError, day.__mul__, 1e9)
        self.assertRaises(OverflowError, day.__truediv__, 1e-20)
        self.assertRaises(OverflowError, day.__truediv__, 1e-10)
        self.assertRaises(OverflowError, day.__truediv__, 9e-10) 

# 需要导入模块: from datetime import timedelta [as 别名]
# 或者: from datetime.timedelta import resolution [as 别名]
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assertTrue(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assertTrue(dt1 < dt2) 

# 需要导入模块: from datetime import timedelta [as 别名]
# 或者: from datetime.timedelta import resolution [as 别名]
def test_resolution_info(self):
        self.assertIsInstance(timedelta.min, timedelta)
        self.assertIsInstance(timedelta.max, timedelta)
        self.assertIsInstance(timedelta.resolution, timedelta)
        self.assertTrue(timedelta.max > timedelta.min)
        self.assertEqual(timedelta.min, timedelta(-999999999))
        self.assertEqual(timedelta.max, timedelta(999999999, 24*3600-1, 1e6-1))
        self.assertEqual(timedelta.resolution, timedelta(0, 0, 1)) 

# 需要导入模块: from datetime import timedelta [as 别名]
# 或者: from datetime.timedelta import resolution [as 别名]
def test_overflow(self):
        tiny = timedelta.resolution

        td = timedelta.min + tiny
        td -= tiny  # no problem
        self.assertRaises(OverflowError, td.__sub__, tiny)
        self.assertRaises(OverflowError, td.__add__, -tiny)

        td = timedelta.max - tiny
        td += tiny  # no problem
        self.assertRaises(OverflowError, td.__add__, tiny)
        self.assertRaises(OverflowError, td.__sub__, -tiny)

        self.assertRaises(OverflowError, lambda: -timedelta.max) 

# 需要导入模块: from datetime import timedelta [as 别名]
# 或者: from datetime.timedelta import resolution [as 别名]
def test_today(self):
        import time

        # We claim that today() is like fromtimestamp(time.time()), so
        # prove it.
        for dummy in range(3):
            today = self.theclass.today()
            ts = time.time()
            todayagain = self.theclass.fromtimestamp(ts)
            if today == todayagain:
                break
            # There are several legit reasons that could fail:
            # 1. It recently became midnight, between the today() and the
            #    time() calls.
            # 2. The platform time() has such fine resolution that we'll
            #    never get the same value twice.
            # 3. The platform time() has poor resolution, and we just
            #    happened to call today() right before a resolution quantum
            #    boundary.
            # 4. The system clock got fiddled between calls.
            # In any case, wait a little while and try again.
            time.sleep(0.1)

        # It worked or it didn't.  If it didn't, assume it's reason #2, and
        # let the test pass if they're within half a second of each other.
        if today != todayagain:
            self.assertAlmostEqual(todayagain, today,
                                   delta=timedelta(seconds=0.5)) 

# 需要导入模块: from datetime import timedelta [as 别名]
# 或者: from datetime.timedelta import resolution [as 别名]
def test_today(self):
        import time

        # We claim that today() is like fromtimestamp(time.time()), so
        # prove it.
        for dummy in range(3):
            today = self.theclass.today()
            ts = time.time()
            todayagain = self.theclass.fromtimestamp(ts)
            if today == todayagain:
                break
            # There are several legit reasons that could fail:
            # 1. It recently became midnight, between the today() and the
            #    time() calls.
            # 2. The platform time() has such fine resolution that we'll
            #    never get the same value twice.
            # 3. The platform time() has poor resolution, and we just
            #    happened to call today() right before a resolution quantum
            #    boundary.
            # 4. The system clock got fiddled between calls.
            # In any case, wait a little while and try again.
            time.sleep(0.1)

        # It worked or it didn't.  If it didn't, assume it's reason #2, and
        # let the test pass if they're within half a second of each other.
        self.assertTrue(today == todayagain or
                        abs(todayagain - today) < timedelta(seconds=0.5)) 

# 需要导入模块: from datetime import timedelta [as 别名]
# 或者: from datetime.timedelta import resolution [as 别名]
def test_microsecond_rounding(self):
        td = timedelta
        eq = self.assertEqual

        # Single-field rounding.
        eq(td(milliseconds=0.4/1000), td(0))    # rounds to 0
        eq(td(milliseconds=-0.4/1000), td(0))    # rounds to 0
        eq(td(milliseconds=0.5/1000), td(microseconds=0))
        eq(td(milliseconds=-0.5/1000), td(microseconds=-0))
        eq(td(milliseconds=0.6/1000), td(microseconds=1))
        eq(td(milliseconds=-0.6/1000), td(microseconds=-1))
        eq(td(milliseconds=1.5/1000), td(microseconds=2))
        eq(td(milliseconds=-1.5/1000), td(microseconds=-2))
        eq(td(seconds=0.5/10**6), td(microseconds=0))
        eq(td(seconds=-0.5/10**6), td(microseconds=-0))
        eq(td(seconds=1/2**7), td(microseconds=7812))
        eq(td(seconds=-1/2**7), td(microseconds=-7812))

        # Rounding due to contributions from more than one field.
        us_per_hour = 3600e6
        us_per_day = us_per_hour * 24
        eq(td(days=.4/us_per_day), td(0))
        eq(td(hours=.2/us_per_hour), td(0))
        eq(td(days=.4/us_per_day, hours=.2/us_per_hour), td(microseconds=1))

        eq(td(days=-.4/us_per_day), td(0))
        eq(td(hours=-.2/us_per_hour), td(0))
        eq(td(days=-.4/us_per_day, hours=-.2/us_per_hour), td(microseconds=-1))

        # Test for a patch in Issue 8860
        eq(td(microseconds=0.5), 0.5*td(microseconds=1.0))
        eq(td(microseconds=0.5)//td.resolution, 0.5*td.resolution//td.resolution)