On Apr 10, 3:37 pm, Floris Bruynooghe <[EMAIL PROTECTED]>
wrote:
> On Apr 7, 2:19 pm, "Andrii V. Mishkovskyi" <[EMAIL PROTECTED]> wrote:
>
> > 2008/4/7, Floris Bruynooghe <[EMAIL PROTECTED]>:
>
> > > Have been grepping all over the place and failed to find it. I found
> > > the test module for them, but that doesn't get me very far...
>
> > I think you should take a look at 'descrobject.c' file in 'Objects'
> > directory.
>
> Thanks, I found it! So after some looking around here was my
> implementation:
>
> class myproperty(property):
> def setter(self, func):
> self.fset = func
>
> But that doesn't work since fset is a read only attribute (and all of
> this is implemented in C).
>
> So I've settled with the (nearly) original proposal from Guido on
> python-dev:
>
> def propset(prop):
> assert isinstance(prop, property)
> @functools.wraps
> def helper(func):
> return property(prop.fget, func, prop.fdel, prop.__doc__)
> return helper
>
> The downside of this is that upgrade from 2.5 to 2.6 will require code
> changes, I was trying to minimise those to just removing an import
> statement.
>
> Regards
> Floris
Here's an implementation of prop.setter in pure python < 2.6, but
using sys._getframe, and the only test performed is the one below :)
import sys
def find_key(mapping, searchval):
for key, val in mapping.iteritems():
if val == searchval:
return key
_property = property
class property(property):
def setter(self, fset):
cls_ns = sys._getframe(1).f_locals
propname = find_key(cls_ns, self)
# if not propname: there's a problem!
cls_ns[propname] = property(self.fget, fset,
self.fdel, self.__doc__)
return fset
# getter and deleter can be defined the same way!
# -------- Example -------
class Foo(object):
@property
def bar(self):
return self._bar
@bar.setter
def setbar(self, x):
self._bar = '<%s>' % x
# -------- Interactive test -----
>>> foo = Foo()
>>> foo.bar = 3
>>> foo.bar
'<3>'
>>> foo.bar = 'oeufs'
>>> foo.bar
'<oeufs>'
>>>
Having fun'ly yours,
--
Arnaud
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