On 4/15/2013 10:32 PM, Steven D'Aprano wrote:
On Mon, 15 Apr 2013 20:52:58 -0400, Terry Jan Reedy wrote:
Some builtin classes cannot be subclassed. There is an issue to document
which better. That does not mean that it is not a class.
I think it is also important to document whether that is a language
feature, or a mere restriction of the implementation. There is an
important distinction to be made between:
"In CPython, you cannot subclass slice or FunctionType. Other Pythons may
have more, or fewer, restrictions."
and:
"No language that calls itself Python is permitted to allow slice and
FunctionType to be subclassable."
If I had a say in this, I would vote for the first case, with the
possible exception of documented singleton types like NoneType and bool.
I will keep the above in mind if I write or review a patch. here are 4
non-subclassable builtin classes. Two are already documented. Bool in
one, forget which other. I believe it was recently decided to leave the
other two as is given the absence of any practical use case.
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