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The tzinfo methods utcoffset() and dst() must return a timedelta object 

(or None) now.  In 2.3a1 they could also return an int or long, but that
was an unhelpfully redundant leftover from an earlier version wherein
they couldn't return a timedelta.  TOOWTDI.
This commit is contained in:
Tim Peters 2003-01-02 21:28:08 +00:00
parent 4abd5f0fce
commit 397301eccb
5 changed files with 84 additions and 77 deletions
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29
Doc/lib/libdatetime.tex
View File

@ -231,18 +231,19 @@ Supported operations:
{(1)}
\lineiii{\var{t1} = \var{t2} // \var{i}}
{The floor is computed and the remainder (if any) is thrown away.}
{(2)}
{(3)}
\lineiii{+\var{t1}}
{Returns a \class{timedelta} object with the same value.}
{}
{(2)}
\lineiii{-\var{t1}}
{equivalent to \class{timedelta}(-\var{t1.days}, -\var{t1.seconds},
-\var{t1.microseconds}),and to \var{t1}* -1.}
{(1)(3)}
{(1)(4)}
\lineiii{abs(\var{t})}
{equivalent to +\var{t} when \code{t.days >= 0}, and to
-\var{t} when \code{t.days < 0}.}
{(1)}
-\var{t} when \code{t.days < 0}.
overflow.}
{(2)}
\end{tableiii}
\noindent
Notes:
@ -252,9 +253,12 @@ Notes:
This is exact, but may overflow.
\item[(2)]
Division by 0 raises \exception{ZeroDivisionError}.
This is exact, and cannot overflow.
\item[(3)]
Division by 0 raises \exception{ZeroDivisionError}.
\item[(4)]
-\var{timedelta.max} is not representable as a \class{timedelta} object.
\end{description}
@ -883,11 +887,10 @@ implement all of them.
\class{tzinfo} object represents both time zone and DST adjustments,
\method{utcoffset()} should return their sum. If the UTC offset
isn't known, return \code{None}. Else the value returned must be
an integer, in the range -1439 to 1439 inclusive (1440 = 24*60;
the magnitude of the offset must be less than one day), or a
\class{timedelta} object representing a whole number of minutes
in the same range. Most implementations of \method{utcoffset()}
will probably look like one of these two:
a \class{timedelta} object specifying a whole number of minutes in the
range -1439 to 1439 inclusive (1440 = 24*60; the magnitude of the offset
must be less than one day). Most implementations of
\method{utcoffset()} will probably look like one of these two:
\begin{verbatim}
return CONSTANT # fixed-offset class
@ -896,8 +899,6 @@ implement all of them.
If \method{utcoffset()} does not return \code{None},
\method{dst()} should not return \code{None} either.
\end{methoddesc}
@ -905,7 +906,7 @@ implement all of them.
Return the daylight savings time (DST) adjustment, in minutes east of
UTC, or \code{None} if DST information isn't known. Return \code{0} if
DST is not in effect.
If DST is in effect, return the offset as an integer or
If DST is in effect, return the offset as a
\class{timedelta} object (see \method{utcoffset()} for details).
Note that DST offset, if applicable, has
already been added to the UTC offset returned by

15
Doc/lib/tzinfo-examples.py
View File

@ -1,16 +1,18 @@
from datetime import tzinfo
from datetime import tzinfo, timedelta
ZERO = timedelta(0)
class UTC(tzinfo):
"""UTC"""
def utcoffset(self, dt):
return 0
return ZERO
def tzname(self, dt):
return "UTC"
def dst(self, dt):
return 0
return ZERO
class FixedOffset(tzinfo):
"""Fixed offset in minutes east from UTC."""
@ -26,8 +28,7 @@ class FixedOffset(tzinfo):
return self.__name
def dst(self, dt):
# It depends on more than we know in an example.
return None # Indicate we don't know
return ZERO
import time
@ -43,9 +44,9 @@ class LocalTime(tzinfo):
def utcoffset(self, dt):
if self._isdst(dt):
return -time.timezone/60
return timedelta(seconds=-time.timezone)
else:
return -time.altzone/60
return timedelta(seconds=-time.altzone)
def tzname(self, dt):
return time.tzname[self._isdst(dt)]

62
Lib/test/test_datetime.py
View File

@ -26,6 +26,10 @@ class TestModule(unittest.TestCase):
class FixedOffset(tzinfo):
def __init__(self, offset, name, dstoffset=42):
if isinstance(offset, int):
offset = timedelta(minutes=offset)
if isinstance(dstoffset, int):
dstoffset = timedelta(minutes=dstoffset)
self.__offset = offset
self.__name = name
self.__dstoffset = dstoffset
@ -72,9 +76,9 @@ class TestTZInfo(unittest.TestCase):
fo = FixedOffset(3, "Three")
self.failUnless(isinstance(fo, tzinfo))
for dt in datetime.now(), None:
self.assertEqual(fo.utcoffset(dt), 3)
self.assertEqual(fo.utcoffset(dt), timedelta(minutes=3))
self.assertEqual(fo.tzname(dt), "Three")
self.assertEqual(fo.dst(dt), 42)
self.assertEqual(fo.dst(dt), timedelta(minutes=42))
def test_pickling_base(self):
import pickle, cPickle
@ -94,10 +98,11 @@ class TestTZInfo(unittest.TestCase):
import pickle, cPickle
# Make sure we can pickle/unpickle an instance of a subclass.
orig = PicklableFixedOffset(-300, 'cookie')
offset = timedelta(minutes=-300)
orig = PicklableFixedOffset(offset, 'cookie')
self.failUnless(isinstance(orig, tzinfo))
self.failUnless(type(orig) is PicklableFixedOffset)
self.assertEqual(orig.utcoffset(None), -300)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), 'cookie')
for pickler in pickle, cPickle:
for binary in 0, 1:
@ -105,7 +110,7 @@ class TestTZInfo(unittest.TestCase):
derived = pickler.loads(green)
self.failUnless(isinstance(derived, tzinfo))
self.failUnless(type(derived) is PicklableFixedOffset)
self.assertEqual(derived.utcoffset(None), -300)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), 'cookie')
#############################################################################
@ -1562,7 +1567,8 @@ class TZInfoBase(unittest.TestCase):
# A datetimetz passes itself on, a timetz passes None.
class introspective(tzinfo):
def tzname(self, dt): return dt and "real" or "none"
def utcoffset(self, dt): return dt and 42 or -42
def utcoffset(self, dt):
return timedelta(minutes = dt and 42 or -42)
dst = utcoffset
obj = cls(1, 2, 3, tzinfo=introspective())
@ -1593,7 +1599,7 @@ class TZInfoBase(unittest.TestCase):
def test_utc_offset_out_of_bounds(self):
class Edgy(tzinfo):
def __init__(self, offset):
self.offset = offset
self.offset = timedelta(minutes=offset)
def utcoffset(self, dt):
return self.offset
@ -1629,15 +1635,11 @@ class TZInfoBase(unittest.TestCase):
self.failUnless(t.dst() is None)
self.failUnless(t.tzname() is None)
class C2(tzinfo):
def utcoffset(self, dt): return -1439
def dst(self, dt): return 1439
def tzname(self, dt): return "aname"
class C3(tzinfo):
def utcoffset(self, dt): return timedelta(minutes=-1439)
def dst(self, dt): return timedelta(minutes=1439)
def tzname(self, dt): return "aname"
for t in cls(1, 1, 1, tzinfo=C2()), cls(1, 1, 1, tzinfo=C3()):
t = cls(1, 1, 1, tzinfo=C3())
self.assertEqual(t.utcoffset(), timedelta(minutes=-1439))
self.assertEqual(t.dst(), timedelta(minutes=1439))
self.assertEqual(t.tzname(), "aname")
@ -1645,7 +1647,7 @@ class TZInfoBase(unittest.TestCase):
# Wrong types.
class C4(tzinfo):
def utcoffset(self, dt): return "aname"
def dst(self, dt): return ()
def dst(self, dt): return 7
def tzname(self, dt): return 0
t = cls(1, 1, 1, tzinfo=C4())
self.assertRaises(TypeError, t.utcoffset)
@ -1653,13 +1655,10 @@ class TZInfoBase(unittest.TestCase):
self.assertRaises(TypeError, t.tzname)
# Offset out of range.
class C5(tzinfo):
def utcoffset(self, dt): return -1440
def dst(self, dt): return 1440
class C6(tzinfo):
def utcoffset(self, dt): return timedelta(hours=-24)
def dst(self, dt): return timedelta(hours=24)
for t in cls(1, 1, 1, tzinfo=C5()), cls(1, 1, 1, tzinfo=C6()):
t = cls(1, 1, 1, tzinfo=C6())
self.assertRaises(ValueError, t.utcoffset)
self.assertRaises(ValueError, t.dst)
@ -1679,9 +1678,11 @@ class TZInfoBase(unittest.TestCase):
class OperandDependentOffset(tzinfo):
def utcoffset(self, t):
if t.minute < 10:
return t.minute # d0 and d1 equal after adjustment
# d0 and d1 equal after adjustment
return timedelta(minutes=t.minute)
else:
return 59 # d2 off in the weeds
# d2 off in the weeds
return timedelta(minutes=59)
base = cls(8, 9, 10, tzinfo=OperandDependentOffset())
d0 = base.replace(minute=3)
@ -1937,9 +1938,9 @@ class TestTimeTZ(TestTime, TZInfoBase):
# In timetz w/ identical tzinfo objects, utcoffset is ignored.
class Varies(tzinfo):
def __init__(self):
self.offset = 22
self.offset = timedelta(minutes=22)
def utcoffset(self, t):
self.offset += 1
self.offset += timedelta(minutes=1)
return self.offset
v = Varies()
@ -2028,7 +2029,8 @@ class TestDateTimeTZ(TestDateTime, TZInfoBase):
# Try a bogus uctoffset.
class Bogus(tzinfo):
def utcoffset(self, dt): return 1440 # out of bounds
def utcoffset(self, dt):
return timedelta(minutes=1440) # out of bounds
t1 = self.theclass(2, 2, 2, tzinfo=Bogus())
t2 = self.theclass(2, 2, 2, tzinfo=FixedOffset(0, ""))
self.assertRaises(ValueError, lambda: t1 == t2)
@ -2259,6 +2261,8 @@ class TestDateTimeTZ(TestDateTime, TZInfoBase):
# DST flag.
class DST(tzinfo):
def __init__(self, dstvalue):
if isinstance(dstvalue, int):
dstvalue = timedelta(minutes=dstvalue)
self.dstvalue = dstvalue
def dst(self, dt):
return self.dstvalue
@ -2291,6 +2295,8 @@ class TestDateTimeTZ(TestDateTime, TZInfoBase):
def test_utctimetuple(self):
class DST(tzinfo):
def __init__(self, dstvalue):
if isinstance(dstvalue, int):
dstvalue = timedelta(minutes=dstvalue)
self.dstvalue = dstvalue
def dst(self, dt):
return self.dstvalue
@ -2303,7 +2309,7 @@ class TestDateTimeTZ(TestDateTime, TZInfoBase):
class UOFS(DST):
def __init__(self, uofs, dofs=None):
DST.__init__(self, dofs)
self.uofs = uofs
self.uofs = timedelta(minutes=uofs)
def utcoffset(self, dt):
return self.uofs
@ -2454,9 +2460,11 @@ class TestDateTimeTZ(TestDateTime, TZInfoBase):
class OperandDependentOffset(tzinfo):
def utcoffset(self, t):
if t.minute < 10:
return t.minute # d0 and d1 equal after adjustment
# d0 and d1 equal after adjustment
return timedelta(minutes=t.minute)
else:
return 59 # d2 off in the weeds
# d2 off in the weeds
return timedelta(minutes=59)
base = cls(8, 9, 10, 11, 12, 13, 14, tzinfo=OperandDependentOffset())
d0 = base.replace(minute=3)
@ -2502,9 +2510,9 @@ class TestDateTimeTZ(TestDateTime, TZInfoBase):
# In datetimetz w/ identical tzinfo objects, utcoffset is ignored.
class Varies(tzinfo):
def __init__(self):
self.offset = 22
self.offset = timedelta(minutes=22)
def utcoffset(self, t):
self.offset += 1
self.offset += timedelta(minutes=1)
return self.offset
v = Varies()

7
Misc/NEWS
View File

@ -27,9 +27,14 @@ Extension modules
microsecond <http://www.python.org/sf/661086>.
In dt.asdatetime(tz), if tz.utcoffset(dt) returns a duration,
ValueError is raised of tz.dst(dt) returns None (2.3a1 treated it
ValueError is raised if tz.dst(dt) returns None (2.3a1 treated it
as 0 instead).
The tzinfo methods utcoffset() and dst() must return a timedelta object
(or None) now. In 2.3a1 they could also return an int or long, but that
was an unhelpfully redundant leftover from an earlier version wherein
they couldn't return a timedelta. TOOWTDI.
Library
-------

36
Modules/datetimemodule.c
View File

@ -629,11 +629,9 @@ replace_tzinfo(PyObject *self, PyObject *newtzinfo)
/* Call getattr(tzinfo, name)(tzinfoarg), and extract an int from the
* result. tzinfo must be an instance of the tzinfo class. If the method
* returns None, this returns 0 and sets *none to 1. If the method doesn't
* return a Python int or long or timedelta, TypeError is raised and this
* returns -1. If it returns an int or long, but is outside the valid
* range for a UTC minute offset, or it returns a timedelta and the value is
* out of range or isn't a whole number of minutes, ValueError is raised and
* this returns -1.
* return None or timedelta, TypeError is raised and this returns -1. If it
* returnsa timedelta and the value is out of range or isn't a whole number
* of minutes, ValueError is raised and this returns -1.
* Else *none is set to 0 and the integer method result is returned.
*/
static int
@ -641,7 +639,7 @@ call_utc_tzinfo_method(PyObject *tzinfo, char *name, PyObject *tzinfoarg,
int *none)
{
PyObject *u;
long result = -1; /* Py{Int,Long}_AsLong return long */
int result = -1;
assert(tzinfo != NULL);
assert(PyTZInfo_Check(tzinfo));
@ -656,12 +654,6 @@ call_utc_tzinfo_method(PyObject *tzinfo, char *name, PyObject *tzinfoarg,
result = 0;
*none = 1;
}
else if (PyInt_Check(u))
result = PyInt_AS_LONG(u);
else if (PyLong_Check(u))
result = PyLong_AsLong(u);
else if (PyDelta_Check(u)) {
const int days = GET_TD_DAYS(u);
if (days < -1 || days > 0)
@ -683,7 +675,7 @@ call_utc_tzinfo_method(PyObject *tzinfo, char *name, PyObject *tzinfoarg,
}
else {
PyErr_Format(PyExc_TypeError,
"tzinfo.%s() must return None, integer or "
"tzinfo.%s() must return None or "
"timedelta, not '%s'",
name, u->ob_type->tp_name);
}
@ -696,16 +688,16 @@ call_utc_tzinfo_method(PyObject *tzinfo, char *name, PyObject *tzinfoarg,
name, result);
result = -1;
}
return (int)result;
return result;
}
/* Call tzinfo.utcoffset(tzinfoarg), and extract an integer from the
* result. tzinfo must be an instance of the tzinfo class. If utcoffset()
* returns None, call_utcoffset returns 0 and sets *none to 1. If uctoffset()
& doesn't return a Python int or long, TypeError is raised and this
* returns -1. If utcoffset() returns an int outside the legitimate range
* for a UTC offset, ValueError is raised and this returns -1. Else
* *none is set to 0 and the offset is returned.
* doesn't return None or timedelta, TypeError is raised and this returns -1.
* If utcoffset() returns an invalid timedelta (out of range, or not a whole
* # of minutes), ValueError is raised and this returns -1. Else *none is
* set to 0 and the offset is returned (as int # of minutes east of UTC).
*/
static int
call_utcoffset(PyObject *tzinfo, PyObject *tzinfoarg, int *none)
@ -745,10 +737,10 @@ offset_as_timedelta(PyObject *tzinfo, char *name, PyObject *tzinfoarg) {
/* Call tzinfo.dst(tzinfoarg), and extract an integer from the
* result. tzinfo must be an instance of the tzinfo class. If dst()
* returns None, call_dst returns 0 and sets *none to 1. If dst()
& doesn't return a Python int or long, TypeError is raised and this
* returns -1. If dst() returns an int outside the legitimate range
* for a UTC offset, ValueError is raised and this returns -1. Else
* *none is set to 0 and the offset is returned.
& doesn't return None or timedelta, TypeError is raised and this
* returns -1. If dst() returns an invalid timedelta for for a UTC offset,
* ValueError is raised and this returns -1. Else *none is set to 0 and
* the offset is returned (as an int # of minutes east of UTC).
*/
static int
call_dst(PyObject *tzinfo, PyObject *tzinfoarg, int *none)