On Thu, 15 Dec 2011 05:35:55 -0800, Steve Howell wrote:
> For the special methods like __enter__ and __exit__, the tricky part
> isn't understanding what would happen once the methods were called; the
> tricky part is getting them to be called in the first place, if they
> were not declared inside the class or attached to the class.
If you *must* have per-instance special methods, my advice is to use a
bit of scaffolding like this:
class Whatever:
def __enter__(self, *args):
try:
enter = self.__dict__['__enter__']
except KeyError:
do_something_else() # or just let the exception occur
else:
enter(*args)
Otherwise just live with the limitation that you can override all methods
per-instance *except* dunders, and design your application accordingly.
--
Steven
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