kxroberto kxrobe...@users.sourceforge.net added the comment:
Well, == whould allow the wanted feature by exception through meta classes
for concerned classes:
class X:
... a=1
...
Y=X
class X:
... a=1
...
Y==X
False
class XCompare(type):
... def __eq__(self, other):
... print tolerant class __eq__
... return self.__name__ == other.__name__
...
class X:
... __metaclass__ = XCompare
... a=1
...
Y=X
class X:
... a=1
...
Y==X
tolerant class __eq__
True
Better than nothing. Its a improvement generally, independently.
But thinking about my acutal use cases and all: It still doesn't satisfy. I
don't want to introduce this extra magic on all those classes just for that
feature - because when needed, the majority of classes are concerned (see
below). One can have only one meta class ... its too tricky and off-road to
guess for most programmers ...
when in doubt, raise an error: That is IMHO too rigid here, and generally
when a feature is then hindered too much. Aren't warnings the right tool for
such case? If really rarely there is problem, should it surface easily already
during dev test time?
Compared to the everday life danger of Pythons dynamic attribute access,
version incompatibilities, etc. its about a rather harmless issue here.
Now I'd vote for a warnings.warn upon == (or old is) failing , and then an
error only when the .__name__ is not matching too. A warning at dev test time
should be enough, when just == (or is) fails.
I mainly like the tolerance during development: e.g. fast reload style edit-run
cycles (reload sometimes improved with special reload fix code), because I
noticed that 95% of code changes/bug fixes do not require a full expensive
app-restart. This pays off particularly with bigger GUI app development/fixing
and similar, where lot of status is accumulated expensively during run time.
But I wished that feature already for a deployed app too.
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