Am 28.05.2010 11:31, schrieb eb303:
> On May 27, 3:24 pm, Christian Heimes <li...@cheimes.de> wrote:
>>> Do I miss something?
>>> Is this the way to do it, or is there a better one?
>>
>> A better way was introduced in Python 2.6.
>> Seehttp://docs.python.org/library/functions.html?highlight=property#prop...
>> I have a Python only version around if you are still using Python 2.5.
>>
>> Christian
>
> Mmmm, I might still miss something. OK, I can replace my initial
> property using @property and @p.setter, but it doesn't seem to work in
> subclasses:
>
> class A(object):
> @property
> def p(self):
> return self._p
> @p.setter
> def _set_p(self, p):
> self._p = p
> class B(A):
> @p.setter
> def _set_p(self, p):
> …
>
> results in:
>
> Traceback (most recent call last):
> File "toto.py", line 8, in <module>
> class B(A):
> File "toto.py", line 9, in B
> @p.setter
> NameError: name 'p' is not defined
It doesn't work because "p" is not in the scope of B's body while B is
created. You have to write
class B(A):
# access the "p" property from class A
@A.p.setter
def p(self, p):
pass
# once p is in the class body scope, you must not use A.p again
@p.deleter
def p(self):
pass
Christian
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