Update of /cvsroot/python/python/nondist/sandbox/datetime
In directory sc8-pr-cvs1:/tmp/cvs-serv30286
Modified Files:
US.py datetime.py doc.txt test_datetime.py
Log Message:
A step on the way to making tzinfo classes writable by mortals: get rid
of the timetz case. A tzinfo method will always see a datetimetz arg,
or None, now. In the former case, it's still possible that it will get
a datetimetz argument belonging to a different timezone. That will get
fixed next (but I have to pause to bring the 2.3 C implementation into
synch with this change first).
Index: US.py
===================================================================
RCS file: /cvsroot/python/python/nondist/sandbox/datetime/US.py,v
retrieving revision 1.12
retrieving revision 1.13
diff -C2 -d -r1.12 -r1.13
*** US.py 28 Dec 2002 18:16:46 -0000 1.12
--- US.py 30 Dec 2002 19:43:21 -0000 1.13
***************
*** 68,72 ****
def dst(self, dt):
! if dt is None or isinstance(dt, time) or dt.tzinfo is None:
# An exception instead may be sensible here, in one or more of
# the cases.
--- 68,72 ----
def dst(self, dt):
! if dt is None or dt.tzinfo is None:
# An exception instead may be sensible here, in one or more of
# the cases.
Index: datetime.py
===================================================================
RCS file: /cvsroot/python/python/nondist/sandbox/datetime/datetime.py,v
retrieving revision 1.128
retrieving revision 1.129
diff -C2 -d -r1.128 -r1.129
*** datetime.py 27 Dec 2002 21:31:40 -0000 1.128
--- datetime.py 30 Dec 2002 19:43:21 -0000 1.129
***************
*** 217,224 ****
return _time.strftime(newformat, timetuple)
! def _call_tzinfo_method(self, tzinfo, methname):
if tzinfo is None:
return None
! return getattr(tzinfo, methname)(self)
# Just raise TypeError if the arg isn't None or a string.
--- 217,224 ----
return _time.strftime(newformat, timetuple)
! def _call_tzinfo_method(tzinfo, methname, tzinfoarg):
if tzinfo is None:
return None
! return getattr(tzinfo, methname)(tzinfoarg)
# Just raise TypeError if the arg isn't None or a string.
***************
*** 1129,1133 ****
"""Return the timezone offset in minutes east of UTC (negative west of
UTC)."""
! offset = _call_tzinfo_method(self, self._tzinfo, "utcoffset")
offset = _check_utc_offset("utcoffset", offset)
if offset is not None:
--- 1129,1133 ----
"""Return the timezone offset in minutes east of UTC (negative west of
UTC)."""
! offset = _call_tzinfo_method(self._tzinfo, "utcoffset", None)
offset = _check_utc_offset("utcoffset", offset)
if offset is not None:
***************
*** 1137,1141 ****
# Return an integer (or None) instead of a timedelta (or None).
def _utcoffset(self):
! offset = _call_tzinfo_method(self, self._tzinfo, "utcoffset")
offset = _check_utc_offset("utcoffset", offset)
return offset
--- 1137,1141 ----
# Return an integer (or None) instead of a timedelta (or None).
def _utcoffset(self):
! offset = _call_tzinfo_method(self._tzinfo, "utcoffset", None)
offset = _check_utc_offset("utcoffset", offset)
return offset
***************
*** 1148,1152 ****
"-5:00", "EDT", "US/Eastern", "America/New York" are all valid replies.
"""
! name = _call_tzinfo_method(self, self._tzinfo, "tzname")
_check_tzname(name)
return name
--- 1148,1152 ----
"-5:00", "EDT", "US/Eastern", "America/New York" are all valid replies.
"""
! name = _call_tzinfo_method(self._tzinfo, "tzname", None)
_check_tzname(name)
return name
***************
*** 1161,1165 ****
info.
"""
! offset = _call_tzinfo_method(self, self._tzinfo, "dst")
offset = _check_utc_offset("dst", offset)
if offset is not None:
--- 1161,1165 ----
info.
"""
! offset = _call_tzinfo_method(self._tzinfo, "dst", None)
offset = _check_utc_offset("dst", offset)
if offset is not None:
***************
*** 1186,1190 ****
# Return an integer (or None) instead of a timedelta (or None).
def _dst(self):
! offset = _call_tzinfo_method(self, self._tzinfo, "dst")
offset = _check_utc_offset("dst", offset)
return offset
--- 1186,1190 ----
# Return an integer (or None) instead of a timedelta (or None).
def _dst(self):
! offset = _call_tzinfo_method(self._tzinfo, "dst", None)
offset = _check_utc_offset("dst", offset)
return offset
***************
*** 1650,1654 ****
"""Return the timezone offset in minutes east of UTC (negative west of
UTC)."""
! offset = _call_tzinfo_method(self, self._tzinfo, "utcoffset")
offset = _check_utc_offset("utcoffset", offset)
if offset is not None:
--- 1650,1654 ----
"""Return the timezone offset in minutes east of UTC (negative west of
UTC)."""
! offset = _call_tzinfo_method(self._tzinfo, "utcoffset", self)
offset = _check_utc_offset("utcoffset", offset)
if offset is not None:
***************
*** 1658,1662 ****
# Return an integer (or None) instead of a timedelta (or None).
def _utcoffset(self):
! offset = _call_tzinfo_method(self, self._tzinfo, "utcoffset")
offset = _check_utc_offset("utcoffset", offset)
return offset
--- 1658,1662 ----
# Return an integer (or None) instead of a timedelta (or None).
def _utcoffset(self):
! offset = _call_tzinfo_method(self._tzinfo, "utcoffset", self)
offset = _check_utc_offset("utcoffset", offset)
return offset
***************
*** 1669,1673 ****
"-5:00", "EDT", "US/Eastern", "America/New York" are all valid replies.
"""
! name = _call_tzinfo_method(self, self._tzinfo, "tzname")
_check_tzname(name)
return name
--- 1669,1673 ----
"-5:00", "EDT", "US/Eastern", "America/New York" are all valid replies.
"""
! name = _call_tzinfo_method(self._tzinfo, "tzname", self)
_check_tzname(name)
return name
***************
*** 1682,1686 ****
info.
"""
! offset = _call_tzinfo_method(self, self._tzinfo, "dst")
offset = _check_utc_offset("dst", offset)
if offset is not None:
--- 1682,1686 ----
info.
"""
! offset = _call_tzinfo_method(self._tzinfo, "dst", self)
offset = _check_utc_offset("dst", offset)
if offset is not None:
***************
*** 1690,1694 ****
# Return an integer (or None) instead of a timedelta (or None).1573
def _dst(self):
! offset = _call_tzinfo_method(self, self._tzinfo, "dst")
offset = _check_utc_offset("dst", offset)
return offset
--- 1690,1694 ----
# Return an integer (or None) instead of a timedelta (or None).1573
def _dst(self):
! offset = _call_tzinfo_method(self._tzinfo, "dst", self)
offset = _check_utc_offset("dst", offset)
return offset
Index: doc.txt
===================================================================
RCS file: /cvsroot/python/python/nondist/sandbox/datetime/doc.txt,v
retrieving revision 1.74
retrieving revision 1.75
diff -C2 -d -r1.74 -r1.75
*** doc.txt 27 Dec 2002 21:31:40 -0000 1.74
--- doc.txt 30 Dec 2002 19:43:21 -0000 1.75
***************
*** 760,764 ****
class should not be instantiated. You need to derive a concrete
subclass, and (at least) supply implementations of the standard tzinfo
! methods needed by the datetime methods you use. The datetime module does
not supply any concrete subclasses of tzinfo.
--- 760,764 ----
class should not be instantiated. You need to derive a concrete
subclass, and (at least) supply implementations of the standard tzinfo
! methods needed by the datetime methods you use. The datetime module does
not supply any concrete subclasses of tzinfo.
***************
*** 777,786 ****
A concrete subclass of tzinfo may need to implement the following
methods. Exactly which methods are needed depends on the uses made
! of aware datetime objects; if in doubt, simply implement all of them.
! The methods are called by a datetimetz or timetz object, passing itself
! as the argument. A tzinfo subclass's methods should be prepared to
! accept an argument of type None, timetz, or datetimetz.
! - utcoffset(dt)
Return offset of local time from UTC, in minutes east of UTC. If
local time is west of UTC, this should be negative. Note that this
--- 777,783 ----
A concrete subclass of tzinfo may need to implement the following
methods. Exactly which methods are needed depends on the uses made
! of aware datetime objects. If in doubt, simply implement all of them.
! - utcoffset(self, dt)
Return offset of local time from UTC, in minutes east of UTC. If
local time is west of UTC, this should be negative. Note that this
***************
*** 791,797 ****
timedelta object, in the range -1439 to 1439 inclusive (1440 = 24*60;
the magnitude of the offset must be less than one day, and must be
! a whole number of minutes).
! - tzname(dt)
Return the timezone name corresponding to the datetime represented
by dt, as a string. Nothing about string names is defined by the
--- 788,798 ----
timedelta object, in the range -1439 to 1439 inclusive (1440 = 24*60;
the magnitude of the offset must be less than one day, and must be
! a whole number of minutes). Most implementations of utcoffset()
! will probably look like:
! return CONSTANT # fixed-offset class
! return CONSTANT + self.dst(dt) # daylight-aware class
!
! - tzname(self, dt)
Return the timezone name corresponding to the datetime represented
by dt, as a string. Nothing about string names is defined by the
***************
*** 804,808 ****
of dt passed, especially if the tzinfo class is accounting for DST.
! - dst(dt)
Return the DST offset, in minutes east of UTC, or None if DST
information isn't known. Return 0 if DST is not in effect.
--- 805,809 ----
of dt passed, especially if the tzinfo class is accounting for DST.
! - dst(self, dt)
Return the DST offset, in minutes east of UTC, or None if DST
information isn't known. Return 0 if DST is not in effect.
***************
*** 815,818 ****
--- 816,840 ----
tzinfo object's dst() method to determine how the tm_isdst flag
should be set.
+
+ These methods are called by a datetimetz or timetz object, in response to
+ their methods of the same names. A datetimetz object passes itself as the
+ argument, and a timetz object passes None as the argument. A tzinfo
+ subclass's methods should therefore be prepared to accept a dt argument of
+ None, or of class datetimetz.
+
+ When None is passed, it's up to the class designer to decide the best
+ response. For example, returning None is appropriate if the class wishes
+ to say that timetz objects don't participate in the tzinfo protocol. In
+ other applications, it may be more useful for utcoffset(None} to return the
+ standard UTC offset.
+
+ When a datetimetz object is passed in response to a datetimetz method,
+ dt.tzinfo is the same object as self. tzinfo methods can rely on this,
+ unless user code calls tzinfo methods directly. The intent is that the
+ tzinfo methods interpret dt as being in local time, and not need to worry
+ about objects in other timezones.
+ XXX That isn't always true yet: datetimetz.astimezone(tz) can pass
+ XXX a datetimetz with a "foreign" tzinfo to a self.tzinfo method. This
+ XXX needs to be repaired.
Example tzinfo classes:
Index: test_datetime.py
===================================================================
RCS file: /cvsroot/python/python/nondist/sandbox/datetime/test_datetime.py,v
retrieving revision 1.87
retrieving revision 1.88
diff -C2 -d -r1.87 -r1.88
*** test_datetime.py 30 Dec 2002 17:36:58 -0000 1.87
--- test_datetime.py 30 Dec 2002 19:43:21 -0000 1.88
***************
*** 1570,1573 ****
--- 1570,1590 ----
class TZInfoBase(unittest.TestCase):
+ def test_argument_passing(self):
+ cls = self.theclass
+ # 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
+ dst = utcoffset
+
+ obj = cls(1, 2, 3, tzinfo=introspective())
+
+ expected = cls is timetz and "none" or "real"
+ self.assertEqual(obj.tzname(), expected)
+
+ expected = timedelta(minutes=(cls is timetz and -42 or 42))
+ self.assertEqual(obj.utcoffset(), expected)
+ self.assertEqual(obj.dst(), expected)
+
def test_bad_tzinfo_classes(self):
cls = self.theclass
***************
*** 1690,1709 ****
# However, if they're different members, uctoffset is not ignored.
! d0 = base.replace(minute=3, tzinfo=OperandDependentOffset())
! d1 = base.replace(minute=9, tzinfo=OperandDependentOffset())
! d2 = base.replace(minute=11, tzinfo=OperandDependentOffset())
! for x in d0, d1, d2:
! for y in d0, d1, d2:
! got = cmp(x, y)
! if (x is d0 or x is d1) and (y is d0 or y is d1):
! expected = 0
! elif x is y is d2:
! expected = 0
! elif x is d2:
! expected = -1
! else:
! assert y is d2
! expected = 1
! self.assertEqual(got, expected)
--- 1707,1730 ----
# However, if they're different members, uctoffset is not ignored.
! # Note that a timetz can't actually have an operand-depedent offset,
! # though (and timetz.utcoffset() passes None to tzinfo.utcoffset()),
! # so skip this test for timetz.
! if cls is not timetz:
! d0 = base.replace(minute=3, tzinfo=OperandDependentOffset())
! d1 = base.replace(minute=9, tzinfo=OperandDependentOffset())
! d2 = base.replace(minute=11, tzinfo=OperandDependentOffset())
! for x in d0, d1, d2:
! for y in d0, d1, d2:
! got = cmp(x, y)
! if (x is d0 or x is d1) and (y is d0 or y is d1):
! expected = 0
! elif x is y is d2:
! expected = 0
! elif x is d2:
! expected = -1
! else:
! assert y is d2
! expected = 1
! self.assertEqual(got, expected)
***************
*** 2550,2554 ****
def dst(self, dt):
! if dt is None or isinstance(dt, time) or dt.tzinfo is None:
# An exception instead may be sensible here, in one or more of
# the cases.
--- 2571,2575 ----
def dst(self, dt):
! if dt is None or dt.tzinfo is None:
# An exception instead may be sensible here, in one or more of
# the cases.
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