Gavin Panella wrote:
> Hi,
>
> On Python 2.6 and 3.1 the following code works fine:
>
> class Foo(object):
>
> @classmethod
> def __enter__(cls):
> print("__enter__")
>
> @classmethod
> def __exit__(cls, exc_type, exc_value, traceback):
> print("__exit__")
>
> with Foo: pass
>
> However, in 2.7 and 3.2 I get:
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> AttributeError: __exit__
>
> Is this a regression or a deliberate change? Off the top of my head I
> can't think that this pattern is particularly useful, but it seems
> like something that ought to work.
This seems to work:
class MetaWith (type):
@classmethod
def __enter__(cls):
print("__enter__")
@classmethod
def __exit__(cls, exc_type, exc_value, traceback):
print("__exit__")
class With (object):
__metaclass__ = MetaWith
with With:
pass
Mel.
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