George Sakkis wrote:
>
> from itertools import chain, izip, repeat
>
> def ByteProperties(*names, **defaulted_names):
> def byte_property(name, default):
> return property(lambda self: getattr(self, name, default),
> lambda self,v: setattr(self, name, v%256))
> def make_class(clsname, bases, dict):
> for name,default in chain(izip(names, repeat(127)),
> defaulted_names.iteritems()):
> assert name not in dict # sanity check
> dict[name] = byte_property('_'+name, default)
> return type(clsname,bases,dict)
> return make_class
>
>
> class RC(object):
> __metaclass__ = ByteProperties('pwm01', pwm02=64)
Notice that you are NOT using a custom metaclass here, you are just
using the metaclass hook
and you will avoid all issues of custom metaclasses. This is exactly
the approach I advocate
in the paper I referred before, so I think your solution is pretty safe
in that respect. Still I
think in this particular problem avoiding the __metaclass__ at all is
possible and it should be
preferred, just for sake of simplicity, not of safety).
Michele Simionato
M
--
http://mail.python.org/mailman/listinfo/python-list
