我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用datetime.tzinfo.utcoffset()。
def test_pickling_subclass(self): # Make sure we can pickle/unpickle an instance of a subclass. offset = timedelta(minutes=-300) for otype, args in [ (PicklableFixedOffset, (offset, 'cookie')), (timezone, (offset,)), (timezone, (offset, "EST"))]: orig = otype(*args) oname = orig.tzname(None) self.assertIsInstance(orig, tzinfo) self.assertIs(type(orig), otype) self.assertEqual(orig.utcoffset(None), offset) self.assertEqual(orig.tzname(None), oname) for pickler, unpickler, proto in pickle_choices: green = pickler.dumps(orig, proto) derived = unpickler.loads(green) self.assertIsInstance(derived, tzinfo) self.assertIs(type(derived), otype) self.assertEqual(derived.utcoffset(None), offset) self.assertEqual(derived.tzname(None), oname)
def test_astimezone(self): # Pretty boring! The TZ test is more interesting here. astimezone() # simply can't be applied to a naive object. dt = self.theclass.now() f = FixedOffset(44, "") self.assertRaises(TypeError, dt.astimezone) # not enough args self.assertRaises(TypeError, dt.astimezone, f, f) # too many args self.assertRaises(TypeError, dt.astimezone, dt) # arg wrong type self.assertRaises(ValueError, dt.astimezone, f) # naive self.assertRaises(ValueError, dt.astimezone, tz=f) # naive class Bogus(tzinfo): def utcoffset(self, dt): return None def dst(self, dt): return timedelta(0) bog = Bogus() self.assertRaises(ValueError, dt.astimezone, bog) # naive self.assertRaises(ValueError, dt.replace(tzinfo=bog).astimezone, f) class AlsoBogus(tzinfo): def utcoffset(self, dt): return timedelta(0) def dst(self, dt): return None alsobog = AlsoBogus() self.assertRaises(ValueError, dt.astimezone, alsobog) # also naive
def test_pickling(self): # Try one without a tzinfo. args = 20, 59, 16, 64**2 orig = self.theclass(*args) for pickler, unpickler, proto in pickle_choices: green = pickler.dumps(orig, proto) derived = unpickler.loads(green) self.assertEqual(orig, derived) # Try one with a tzinfo. tinfo = PicklableFixedOffset(-300, 'cookie') orig = self.theclass(5, 6, 7, tzinfo=tinfo) for pickler, unpickler, proto in pickle_choices: green = pickler.dumps(orig, proto) derived = unpickler.loads(green) self.assertEqual(orig, derived) self.assertIsInstance(derived.tzinfo, PicklableFixedOffset) self.assertEqual(derived.utcoffset(), timedelta(minutes=-300)) self.assertEqual(derived.tzname(), 'cookie')
def test_pickling(self): # Try one without a tzinfo. args = 6, 7, 23, 20, 59, 1, 64**2 orig = self.theclass(*args) for pickler, unpickler, proto in pickle_choices: green = pickler.dumps(orig, proto) derived = unpickler.loads(green) self.assertEqual(orig, derived) # Try one with a tzinfo. tinfo = PicklableFixedOffset(-300, 'cookie') orig = self.theclass(*args, **{'tzinfo': tinfo}) derived = self.theclass(1, 1, 1, tzinfo=FixedOffset(0, "", 0)) for pickler, unpickler, proto in pickle_choices: green = pickler.dumps(orig, proto) derived = unpickler.loads(green) self.assertEqual(orig, derived) self.assertIsInstance(derived.tzinfo, PicklableFixedOffset) self.assertEqual(derived.utcoffset(), timedelta(minutes=-300)) self.assertEqual(derived.tzname(), 'cookie')
def test_pickling_subclass(self): # Make sure we can pickle/unpickle an instance of a subclass. offset = timedelta(minutes=-300) orig = PicklableFixedOffset(offset, 'cookie') self.assertIsInstance(orig, tzinfo) self.assertTrue(type(orig) is PicklableFixedOffset) self.assertEqual(orig.utcoffset(None), offset) self.assertEqual(orig.tzname(None), 'cookie') for pickler, unpickler, proto in pickle_choices: green = pickler.dumps(orig, proto) derived = unpickler.loads(green) self.assertIsInstance(derived, tzinfo) self.assertTrue(type(derived) is PicklableFixedOffset) self.assertEqual(derived.utcoffset(None), offset) self.assertEqual(derived.tzname(None), 'cookie') ############################################################################# # Base class for testing a particular aspect of timedelta, time, date and # datetime comparisons.
def test_argument_passing(self): cls = self.theclass # A datetime passes itself on, a time passes None. class introspective(tzinfo): def tzname(self, dt): return dt and "real" or "none" def utcoffset(self, dt): return timedelta(minutes = dt and 42 or -42) dst = utcoffset obj = cls(1, 2, 3, tzinfo=introspective()) expected = cls is time and "none" or "real" self.assertEqual(obj.tzname(), expected) expected = timedelta(minutes=(cls is time and -42 or 42)) self.assertEqual(obj.utcoffset(), expected) self.assertEqual(obj.dst(), expected)
def test_astimezone(self): # Pretty boring! The TZ test is more interesting here. astimezone() # simply can't be applied to a naive object. dt = self.theclass.now() f = FixedOffset(44, "") self.assertRaises(ValueError, dt.astimezone) # naive self.assertRaises(TypeError, dt.astimezone, f, f) # too many args self.assertRaises(TypeError, dt.astimezone, dt) # arg wrong type self.assertRaises(ValueError, dt.astimezone, f) # naive self.assertRaises(ValueError, dt.astimezone, tz=f) # naive class Bogus(tzinfo): def utcoffset(self, dt): return None def dst(self, dt): return timedelta(0) bog = Bogus() self.assertRaises(ValueError, dt.astimezone, bog) # naive self.assertRaises(ValueError, dt.replace(tzinfo=bog).astimezone, f) class AlsoBogus(tzinfo): def utcoffset(self, dt): return timedelta(0) def dst(self, dt): return None alsobog = AlsoBogus() self.assertRaises(ValueError, dt.astimezone, alsobog) # also naive
def test_issue23600(self): DSTDIFF = DSTOFFSET = timedelta(hours=1) class UKSummerTime(tzinfo): """Simple time zone which pretends to always be in summer time, since that's what shows the failure. """ def utcoffset(self, dt): return DSTOFFSET def dst(self, dt): return DSTDIFF def tzname(self, dt): return 'UKSummerTime' tz = UKSummerTime() u = datetime(2014, 4, 26, 12, 1, tzinfo=tz) t = tz.fromutc(u) self.assertEqual(t - t.utcoffset(), u)
def test_pickling_subclass(self): # Make sure we can pickle/unpickle an instance of a subclass. offset = timedelta(minutes=-300) orig = PicklableFixedOffset(offset, 'cookie') self.assertIsInstance(orig, tzinfo) self.assertTrue(type(orig) is PicklableFixedOffset) self.assertEqual(orig.utcoffset(None), offset) self.assertEqual(orig.tzname(None), 'cookie') for pickler, unpickler, proto in pickle_choices: green = pickler.dumps(orig, proto) derived = unpickler.loads(green) self.assertIsInstance(derived, tzinfo) self.assertTrue(type(derived) is PicklableFixedOffset) self.assertEqual(derived.utcoffset(None), offset) self.assertEqual(derived.tzname(None), 'cookie') ############################################################################# # Base clase for testing a particular aspect of timedelta, time, date and # datetime comparisons.
def _TIMESTAMP_LTZ_numpy_to_python(self, ctx): tzinfo = self._get_session_tz() scale = ctx['scale'] def conv(value): zero_fill = ctx['zero_fill'] seconds = int(value[0:-scale - 1]) if scale > 0 else int(value) # construct datetime object to get utcoffset dt = ZERO_EPOCH + timedelta(seconds=seconds) offset = tzinfo.utcoffset(dt) if offset.days < 0: ts = (int(value[0:-scale - 1]) + (offset.seconds - 86400) ) * 1000000000 else: ts = (int(value[0:-scale - 1]) + offset.seconds ) * 1000000000 if scale > 0: ts += (-1 if value[0] == u'-' else 1) * int( value[-scale:] + zero_fill) return numpy.datetime64(ts, 'ns') return conv
def _derive_offset_timestamp(self, value, is_utc=False): """ Derives TZ offset and timestamp from the datatime object """ tzinfo = value.tzinfo if tzinfo is None: # If no tzinfo is attached, use local timezone. tzinfo = self._get_session_tz() if not is_utc else pytz.UTC t = pytz.utc.localize(value, is_dst=False).astimezone(tzinfo) else: # if tzinfo is attached, just covert to epoch time # as the server expects it in UTC anyway t = value offset = tzinfo.utcoffset( t.replace(tzinfo=None)).total_seconds() / 60 + 1440 return offset, t
def __init__(self, offset): # tzinfo.utcoffset() throws an error for sub-minute amounts, # so round minutes = round(offset / 60.0, 0) self.__offset = timedelta(minutes=minutes)
def utcoffset(self, dt): return self.__offset
def test_non_abstractness(self): # In order to allow subclasses to get pickled, the C implementation # wasn't able to get away with having __init__ raise # NotImplementedError. useless = tzinfo() dt = datetime.max self.assertRaises(NotImplementedError, useless.tzname, dt) self.assertRaises(NotImplementedError, useless.utcoffset, dt) self.assertRaises(NotImplementedError, useless.dst, dt)
def test_subclass_must_override(self): class NotEnough(tzinfo): def __init__(self, offset, name): self.__offset = offset self.__name = name self.assertTrue(issubclass(NotEnough, tzinfo)) ne = NotEnough(3, "NotByALongShot") self.assertIsInstance(ne, tzinfo) dt = datetime.now() self.assertRaises(NotImplementedError, ne.tzname, dt) self.assertRaises(NotImplementedError, ne.utcoffset, dt) self.assertRaises(NotImplementedError, ne.dst, dt)
def test_normal(self): fo = FixedOffset(3, "Three") self.assertIsInstance(fo, tzinfo) for dt in datetime.now(), None: self.assertEqual(fo.utcoffset(dt), timedelta(minutes=3)) self.assertEqual(fo.tzname(dt), "Three") self.assertEqual(fo.dst(dt), timedelta(minutes=42))
def test_utcoffset(self): dummy = self.DT for h in [0, 1.5, 12]: offset = h * HOUR self.assertEqual(offset, timezone(offset).utcoffset(dummy)) self.assertEqual(-offset, timezone(-offset).utcoffset(dummy)) with self.assertRaises(TypeError): self.EST.utcoffset('') with self.assertRaises(TypeError): self.EST.utcoffset(5)
def test_fromutc(self): with self.assertRaises(ValueError): timezone.utc.fromutc(self.DT) with self.assertRaises(TypeError): timezone.utc.fromutc('not datetime') for tz in [self.EST, self.ACDT, Eastern]: utctime = self.DT.replace(tzinfo=tz) local = tz.fromutc(utctime) self.assertEqual(local - utctime, tz.utcoffset(local)) self.assertEqual(local, self.DT.replace(tzinfo=timezone.utc))
def test_aware_datetime(self): # test that timezone instances can be used by datetime t = datetime(1, 1, 1) for tz in [timezone.min, timezone.max, timezone.utc]: self.assertEqual(tz.tzname(t), t.replace(tzinfo=tz).tzname()) self.assertEqual(tz.utcoffset(t), t.replace(tzinfo=tz).utcoffset()) self.assertEqual(tz.dst(t), t.replace(tzinfo=tz).dst()) ############################################################################# # Base clase for testing a particular aspect of timedelta, time, date and # datetime comparisons.
def test_strptime(self): string = '2004-12-01 13:02:47.197' format = '%Y-%m-%d %H:%M:%S.%f' expected = _strptime._strptime_datetime(self.theclass, string, format) got = self.theclass.strptime(string, format) self.assertEqual(expected, got) self.assertIs(type(expected), self.theclass) self.assertIs(type(got), self.theclass) strptime = self.theclass.strptime self.assertEqual(strptime("+0002", "%z").utcoffset(), 2 * MINUTE) self.assertEqual(strptime("-0002", "%z").utcoffset(), -2 * MINUTE) # Only local timezone and UTC are supported for tzseconds, tzname in ((0, 'UTC'), (0, 'GMT'), (-_time.timezone, _time.tzname[0])): if tzseconds < 0: sign = '-' seconds = -tzseconds else: sign ='+' seconds = tzseconds hours, minutes = divmod(seconds//60, 60) dtstr = "{}{:02d}{:02d} {}".format(sign, hours, minutes, tzname) dt = strptime(dtstr, "%z %Z") self.assertEqual(dt.utcoffset(), timedelta(seconds=tzseconds)) self.assertEqual(dt.tzname(), tzname) # Can produce inconsistent datetime dtstr, fmt = "+1234 UTC", "%z %Z" dt = strptime(dtstr, fmt) self.assertEqual(dt.utcoffset(), 12 * HOUR + 34 * MINUTE) self.assertEqual(dt.tzname(), 'UTC') # yet will roundtrip self.assertEqual(dt.strftime(fmt), dtstr) # Produce naive datetime if no %z is provided self.assertEqual(strptime("UTC", "%Z").tzinfo, None) with self.assertRaises(ValueError): strptime("-2400", "%z") with self.assertRaises(ValueError): strptime("-000", "%z")
def test_bad_tzinfo_classes(self): cls = self.theclass self.assertRaises(TypeError, cls, 1, 1, 1, tzinfo=12) class NiceTry(object): def __init__(self): pass def utcoffset(self, dt): pass self.assertRaises(TypeError, cls, 1, 1, 1, tzinfo=NiceTry) class BetterTry(tzinfo): def __init__(self): pass def utcoffset(self, dt): pass b = BetterTry() t = cls(1, 1, 1, tzinfo=b) self.assertTrue(t.tzinfo is b)
def test_utc_offset_out_of_bounds(self): class Edgy(tzinfo): def __init__(self, offset): self.offset = timedelta(minutes=offset) def utcoffset(self, dt): return self.offset cls = self.theclass for offset, legit in ((-1440, False), (-1439, True), (1439, True), (1440, False)): if cls is time: t = cls(1, 2, 3, tzinfo=Edgy(offset)) elif cls is datetime: t = cls(6, 6, 6, 1, 2, 3, tzinfo=Edgy(offset)) else: assert 0, "impossible" if legit: aofs = abs(offset) h, m = divmod(aofs, 60) tag = "%c%02d:%02d" % (offset < 0 and '-' or '+', h, m) if isinstance(t, datetime): t = t.timetz() self.assertEqual(str(t), "01:02:03" + tag) else: self.assertRaises(ValueError, str, t)
def test_mixed_compare(self): t1 = time(1, 2, 3) t2 = time(1, 2, 3) self.assertEqual(t1, t2) t2 = t2.replace(tzinfo=None) self.assertEqual(t1, t2) t2 = t2.replace(tzinfo=FixedOffset(None, "")) self.assertEqual(t1, t2) t2 = t2.replace(tzinfo=FixedOffset(0, "")) self.assertRaises(TypeError, lambda: t1 == t2) # In time w/ identical tzinfo objects, utcoffset is ignored. class Varies(tzinfo): def __init__(self): self.offset = timedelta(minutes=22) def utcoffset(self, t): self.offset += timedelta(minutes=1) return self.offset v = Varies() t1 = t2.replace(tzinfo=v) t2 = t2.replace(tzinfo=v) self.assertEqual(t1.utcoffset(), timedelta(minutes=23)) self.assertEqual(t2.utcoffset(), timedelta(minutes=24)) self.assertEqual(t1, t2) # But if they're not identical, it isn't ignored. t2 = t2.replace(tzinfo=Varies()) self.assertTrue(t1 < t2) # t1's offset counter still going up
def test_subclass_timetz(self): class C(self.theclass): theAnswer = 42 def __new__(cls, *args, **kws): temp = kws.copy() extra = temp.pop('extra') result = self.theclass.__new__(cls, *args, **temp) result.extra = extra return result def newmeth(self, start): return start + self.hour + self.second args = 4, 5, 6, 500, FixedOffset(-300, "EST", 1) dt1 = self.theclass(*args) dt2 = C(*args, **{'extra': 7}) self.assertEqual(dt2.__class__, C) self.assertEqual(dt2.theAnswer, 42) self.assertEqual(dt2.extra, 7) self.assertEqual(dt1.utcoffset(), dt2.utcoffset()) self.assertEqual(dt2.newmeth(-7), dt1.hour + dt1.second - 7) # Testing datetime objects with a non-None tzinfo.
def test_zones(self): est = FixedOffset(-300, "EST") utc = FixedOffset(0, "UTC") met = FixedOffset(60, "MET") t1 = datetime(2002, 3, 19, 7, 47, tzinfo=est) t2 = datetime(2002, 3, 19, 12, 47, tzinfo=utc) t3 = datetime(2002, 3, 19, 13, 47, tzinfo=met) self.assertEqual(t1.tzinfo, est) self.assertEqual(t2.tzinfo, utc) self.assertEqual(t3.tzinfo, met) self.assertEqual(t1.utcoffset(), timedelta(minutes=-300)) self.assertEqual(t2.utcoffset(), timedelta(minutes=0)) self.assertEqual(t3.utcoffset(), timedelta(minutes=60)) self.assertEqual(t1.tzname(), "EST") self.assertEqual(t2.tzname(), "UTC") self.assertEqual(t3.tzname(), "MET") self.assertEqual(hash(t1), hash(t2)) self.assertEqual(hash(t1), hash(t3)) self.assertEqual(hash(t2), hash(t3)) self.assertEqual(t1, t2) self.assertEqual(t1, t3) self.assertEqual(t2, t3) self.assertEqual(str(t1), "2002-03-19 07:47:00-05:00") self.assertEqual(str(t2), "2002-03-19 12:47:00+00:00") self.assertEqual(str(t3), "2002-03-19 13:47:00+01:00") d = 'datetime.datetime(2002, 3, 19, ' self.assertEqual(repr(t1), d + "7, 47, tzinfo=est)") self.assertEqual(repr(t2), d + "12, 47, tzinfo=utc)") self.assertEqual(repr(t3), d + "13, 47, tzinfo=met)")
def test_tzinfo_now(self): meth = self.theclass.now # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up). base = meth() # Try with and without naming the keyword. off42 = FixedOffset(42, "42") another = meth(off42) again = meth(tz=off42) self.assertTrue(another.tzinfo is again.tzinfo) self.assertEqual(another.utcoffset(), timedelta(minutes=42)) # Bad argument with and w/o naming the keyword. self.assertRaises(TypeError, meth, 16) self.assertRaises(TypeError, meth, tzinfo=16) # Bad keyword name. self.assertRaises(TypeError, meth, tinfo=off42) # Too many args. self.assertRaises(TypeError, meth, off42, off42) # We don't know which time zone we're in, and don't have a tzinfo # class to represent it, so seeing whether a tz argument actually # does a conversion is tricky. utc = FixedOffset(0, "utc", 0) for weirdtz in [FixedOffset(timedelta(hours=15, minutes=58), "weirdtz", 0), timezone(timedelta(hours=15, minutes=58), "weirdtz"),]: for dummy in range(3): now = datetime.now(weirdtz) self.assertTrue(now.tzinfo is weirdtz) utcnow = datetime.utcnow().replace(tzinfo=utc) now2 = utcnow.astimezone(weirdtz) if abs(now - now2) < timedelta(seconds=30): break # Else the code is broken, or more than 30 seconds passed between # calls; assuming the latter, just try again. else: # Three strikes and we're out. self.fail("utcnow(), now(tz), or astimezone() may be broken")
def test_more_astimezone(self): # The inherited test_astimezone covered some trivial and error cases. fnone = FixedOffset(None, "None") f44m = FixedOffset(44, "44") fm5h = FixedOffset(-timedelta(hours=5), "m300") dt = self.theclass.now(tz=f44m) self.assertTrue(dt.tzinfo is f44m) # Replacing with degenerate tzinfo raises an exception. self.assertRaises(ValueError, dt.astimezone, fnone) # Ditto with None tz. self.assertRaises(TypeError, dt.astimezone, None) # Replacing with same tzinfo makes no change. x = dt.astimezone(dt.tzinfo) self.assertTrue(x.tzinfo is f44m) self.assertEqual(x.date(), dt.date()) self.assertEqual(x.time(), dt.time()) # Replacing with different tzinfo does adjust. got = dt.astimezone(fm5h) self.assertTrue(got.tzinfo is fm5h) self.assertEqual(got.utcoffset(), timedelta(hours=-5)) expected = dt - dt.utcoffset() # in effect, convert to UTC expected += fm5h.utcoffset(dt) # and from there to local time expected = expected.replace(tzinfo=fm5h) # and attach new tzinfo self.assertEqual(got.date(), expected.date()) self.assertEqual(got.time(), expected.time()) self.assertEqual(got.timetz(), expected.timetz()) self.assertTrue(got.tzinfo is expected.tzinfo) self.assertEqual(got, expected)
def test_mixed_compare(self): t1 = datetime(1, 2, 3, 4, 5, 6, 7) t2 = datetime(1, 2, 3, 4, 5, 6, 7) self.assertEqual(t1, t2) t2 = t2.replace(tzinfo=None) self.assertEqual(t1, t2) t2 = t2.replace(tzinfo=FixedOffset(None, "")) self.assertEqual(t1, t2) t2 = t2.replace(tzinfo=FixedOffset(0, "")) self.assertRaises(TypeError, lambda: t1 == t2) # In datetime w/ identical tzinfo objects, utcoffset is ignored. class Varies(tzinfo): def __init__(self): self.offset = timedelta(minutes=22) def utcoffset(self, t): self.offset += timedelta(minutes=1) return self.offset v = Varies() t1 = t2.replace(tzinfo=v) t2 = t2.replace(tzinfo=v) self.assertEqual(t1.utcoffset(), timedelta(minutes=23)) self.assertEqual(t2.utcoffset(), timedelta(minutes=24)) self.assertEqual(t1, t2) # But if they're not identical, it isn't ignored. t2 = t2.replace(tzinfo=Varies()) self.assertTrue(t1 < t2) # t1's offset counter still going up
