A very common pattern in using properties is as follows:
class Foo(object):
@property
def c(self):
if not hasattr(self, '_c'):
self._c = some_operation(self.a, self.b)
return self._c
Basically, the common usage is to only calculate a properties value
once, and to reuse the result for every lookup after that. This is so
common, that it seems most of my uses of property come in this form.
To this end, should a cachedproperty builtin be included to do this
automatically? Optionally, it might automatically include a default
fset (change the cached value) and fdel (remove the cached value, to
be regenerated next time). I will contribute code, if such a patch
would be accepted.
PS - It seems I am taking over the python-dev summaries, but the
holidays have interfered with those duties! I apologize, and promise
they will come shortly.
--
Read my blog! I depend on your acceptance of my opinion! I am interesting!
http://ironfroggy-code.blogspot.com/
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