On 2011-08-07, at 18:37 , David Townshend wrote:
Is there any reason not to allow similar behaviour for True and False? i.e. True() == True As far as I undersand, that's not the proposal for NoneType (or NotImplementedType or ellipsis) at all.
You're suggesting that the *value* could be callable (and return itself), the proposal is about *types*, and them becoming "normal" (callable) types: currently, if you get a hold of NoneType, NotImplementedType or ellipsis (generally via a call to `type`) you can not use it to get an instance of that class back: >>> type(None)() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: cannot create 'NoneType' instances >>> type(NotImplemented)() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: cannot create 'NotImplementedType' instances >>> type(...)() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: cannot create 'ellipsis' instances This proposal is merely about removing this forbidding. Booleans don't have this issue: `bool` is already a normal (callable) type, and returns `False` when called without arguments.