[Python-Dev] Language reference updated for metaclasses (original) (raw)

Eli Bendersky eliben at gmail.com
Tue Jun 5 09:20:58 CEST 2012

On Tue, Jun 5, 2012 at 10:18 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:

On Tue, Jun 5, 2012 at 1:24 PM, Eli Bendersky <eliben at gmail.com> wrote:

"if an explicit metaclass is given and it is not an instance of type(), then it is used directly as the metaclass" Could you elaborate on this point? Would it perhaps be clearer to say "if an explicit metaclass is given and it is not a class"? Unfortunately, the term "a class" is slightly ambiguous. "cls is a class" can mean either "isinstance(cls, type)" or it can be shorthand for "cls is a user-defined class (i.e. not a builtin type)".

Yes, confusing it is (http://eli.thegreenplace.net/2012/03/30/python-objects-types-classes-and-instances-a-glossary/)

Still, instance of type()" is a bit too cryptic for mere mortals, IMHO.

Eli

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