Hans Mulder wrote:
On 8/08/12 04:14:01, Steven D'Aprano wrote:
NoneType raises an error if you try to create a second instance. bool
just returns one of the two singletons (doubletons?) again.
py> type(None)()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: cannot create 'NoneType' instances
Why is that?
An oversight, and until a few months ago nobody had complained loud
enough. ;)
Why doesn't it just return an existing instance of the type,
like bool, int, str and other built-in non-mutable types do?
In 3.3 it now does.
~Ethan~
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