Edward O added the comment:
Here is a workaround for subclasses (2&3-compatible):
--- start code ---
class MyDate(datetime):
@classmethod
def fromDT(cls, d):
""" :type d: datetime """
return cls(d.year, d.month, d.day, d.hour, d.minute, d.second,
d.microsecond, d.tzinfo)
def replace(self, *args, **kw):
""" :type other: datetime.timedelta
:rtype: MyDate """
return self.fromDT(super(MyDate, self).replace(*args, **kw))
--- end code ---
This is really a bug and not a misuse as datetime was specifically adapted to
be subclassing-friendly. From a look at the (python) source, this seems to be
the only bit that was forgotten.
The real fix is as per yselivanov comment [and no, this has nothing to do with
pickle or copy AFAIK]
----------
versions: +Python 3.4
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<http://bugs.python.org/issue20371>
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