Steven D'Aprano wrote:
Actually, if you look at my example, you will see that it is a method and it
does get the self argument. Here is the critical code again:
from types import MethodType
polly.talk = MethodType(
lambda self: print("Polly wants a spam sandwich!"), polly)
Doing it by hand is cheating.
That's certainly not correct, because Python had classes and instances
before it had descriptors!
Before the descriptor protocol, a subset of its functionality
was hard-wired into the interpreter. There has always been
some magic going on across the instance-class boundary that
doesn't occur across the class-baseclass boundary.
Ah wait, I
think I've got it. If you want (say) your class object itself to support
(say) the + operator, it isn't enough to write a __add__ method on the
class, you have to write it on the metaclass.
That's right.
--
Greg
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