def utcoffset(self, dt):
return self.__offset
python类utcoffset()的实例源码
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
def test_subclass_datetimetz(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.year
args = 2002, 12, 31, 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.year - 7)
# Pain to set up DST-aware tzinfo classes.
def utcoffset(self, dt):
return self.stdoffset + self.dst(dt)
def test_bogus_dst(self):
class ok(tzinfo):
def utcoffset(self, dt): return HOUR
def dst(self, dt): return HOUR
now = self.theclass.now().replace(tzinfo=utc_real)
# Doesn't blow up.
now.astimezone(ok())
# Does blow up.
class notok(ok):
def dst(self, dt): return None
self.assertRaises(ValueError, now.astimezone, notok())
# Sometimes blow up. In the following, tzinfo.dst()
# implementation may return None or not None depending on
# whether DST is assumed to be in effect. In this situation,
# a ValueError should be raised by astimezone().
class tricky_notok(ok):
def dst(self, dt):
if dt.year == 2000:
return None
else:
return 10*HOUR
dt = self.theclass(2001, 1, 1).replace(tzinfo=utc_real)
self.assertRaises(ValueError, dt.astimezone, tricky_notok())
def utcoffset(self, dt):
return self.__offset
