__instancecheck__ metaclasses, how do they work: why do I get True when I tuple, why doesn't print run?

[Peter J. Holzer]

On 2019-11-04 14:54:23 +0000, Rhodri James wrote:
> On 04/11/2019 14:33, Veek M wrote:
> > __metaclass__ = whatever; # is python2.x syntax
> 
> But not Python3: see PEP 3115

Doesn't "X is python2.x syntax" imply "X is not python3 syntax"?

        hp

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   _  | Peter J. Holzer    | Story must make more sense than reality.
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| |   | hjp at hjp.at         |    -- Charles Stross, "Creative writing
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