On 3/21/07, Eric Firing <[EMAIL PROTECTED]> wrote:
> Properties would be OK for 2.3; I was thinking we might want to use
> them. When a getter and setter already exist, all it takes is the one
> extra line of code, plus a suitable (unused) name for the property. I
> decided not to pursue traits (if at all) until we can use the Enthought
> package as-is. But I think that properties could be converted to traits
> very easily if we wanted to do that in the future, so starting with
> properties would not be wasted effort. This is getting a bit off-topic,
> though.
Minor note: if you are going to use properties, make sure all classes
using them are new-style (inherit from object). With old-style
classes, properties fail in silent and mysterious ways that may lead
to much head-scratching.
As far as I can see, it is not currently the case in lines.py (where
Line2D inherits from Artist, which is an old-style class).
agg.py, which makes extensive use of property(), has it properly
wrapped in the following:
import types
try:
_object = types.ObjectType
_newclass = 1
except AttributeError:
class _object : pass
_newclass = 0
del types
and then all calls to property() are of the form:
if _newclass:x = property(_agg.point_type_x_get, _agg.point_type_x_set)
Currently the only two files I see using property() are agg.py and
lines.py; once artist.py is fixed to be new-style, things should be
fine.
And yes, properties are actually OK even with 2.2, so there's no
reason to avoid them (and they do provide a nicer, claner user API).
Decorators are 2.4-only though.
Cheers,
f
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