Sibylle Koczian a écrit :
(snip)
I don't understand at all why I get the same message with this little
script:
############################
import datetime
class meindatum(datetime.date):
def __init__(self, datum):
print "meindatum"
datetime.date.__init__(self, datum.year, datum.month, datum.day)
x1 = datetime.date.today()
print repr(x1)
x2 = meindatum(x1)
print repr(x2)
#######################################
Executing this from the command line:
s...@elend:~> python /windows/E/LinWin/Python/datum_ableiten.py
datetime.date(2009, 3, 25)
Traceback (most recent call last):
File "/windows/E/LinWin/Python/datum_ableiten.py", line 12, in <module>
x2 = meindatum(x1)
TypeError: an integer is required
s...@elend:~>
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)
HTH
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