[Python-Dev] bool does not want to be subclassed?
Tim Peters
tim.one at comcast.net
Thu Feb 12 16:09:28 EST 2004
See
http://mail.python.org/pipermail/python-dev/2002-March/020822.html
[Guido]
I thought about this last night, and realized that you shouldn't be
allowed to subclass bool at all! A subclass would only be useful
when it has instances, but the mere existance of an instance of a
subclass of bool would break the invariant that True and False are
the only instances of bool! (An instance of a subclass of C is also
an instance of C.) I think it's important not to provide a backdoor
to create additional bool instances, so I think bool should not be
subclassable.
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