[Python-ideas] Fix that broken callable builtin

[Ionel Cristian Mărieș]

On Sat, Apr 18, 2015 at 2:23 PM, Steven D'Aprano <steve at pearwood.info>
wrote:

> Are you sure this doesn't already work? It works for me in Python 3.3:


It doesn't really work because of the incomplete checks done in
`callable_builtin`. ​This is what I've tried:

>>> class DynamicCallable:
> ...     is_callable = True
> ...
> ...     def __init__(self, target):
> ...         self.target = target
> ...
> ...     @property
> ...     def __call__(self):
> ...         if self.is_callable:
> ...             return self.target
> ...         else:
> ...             raise AttributeError("Not really ...")
> ...
> >>> dc = DynamicCallable(print)
> >>> dc(1, 2, 3)
> 1 2 3
> >>> callable(dc)
> True
> >>> dc.is_callable = False
> >>> callable(dc)
> True ###### This should be False :(
>

If the "bug" is fixed, then the last thing in the above example would
return False.


Thanks,
-- Ionel Cristian Mărieș, http://blog.ionelmc.ro
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