Bruno Desthuilliers schrieb:
> Sibylle Koczian a écrit :
> (snip)
>>
>>
>> The print command inside the __init__ method isn't executed, so that
>> method doesn't seem to start at all.
>
> this often happens with (usually C-coded) immutable types. The
> initializer is not called, only the "proper" constructor (__new__). The
> following should work (not tested):
>
> class Meindatum(datetime.date):
> def __new__(self, datum):
> print "meindatum"
> return datetime.date(datum.year, datum.month, datum.day)
>
Thank you, that works, and I learned something (didn't know how Python
objects are created). After some trial, error and searching on the
Python website I found how to give Meindatum additional data attributes.
Now it looks like this:
class Sonderdatum(datetime.date):
"""
Date with additional attribute (integer)
"""
def __new__(cls, datum):
print "Hier Sonderdatum.__new__"
(x, y, z) = (datum.year, datum.month, datum.day)
print "Jahr: %d, Monat: %d, Tag: %d" % (x, y, z)
return super(Sonderdatum, cls).__new__(cls, datum.year,
datum.month,
datum.day)
def __init__(self, datum, sonder=0):
print "Hier Sonderdatum.__init__"
# superclass __init__ is _not_ called!
# super(Sonderdatum, self).__init__(x, y, z)
self.sonder = sonder
def testeSondertage():
datum = datetime.datetime.strptime("01.01.2009", "%x")
print repr(datum.date())
xx = Sonderdatum(datum.date())
print xx.year, xx.month, xx.day, xx.sonder
if __name__ == "__main__":
locale.setlocale(locale.LC_ALL, '')
testeSondertage()
And now I'll put this into something remotely useful.
Je vous prie d'agréer mes meilleurs salutations,
Sibylle
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