On 2018-04-14 23:14, Guido van Rossum wrote:
That actually sounds like a pretty big problem. I'm sure there is lots
of code that doesn't *just* duck-type nor calls inspect but uses
isinstance() to decide how to extract the desired information.
I have been thinking about this some more...
One solution to improve backwards compatibility would be to duplicate
some classes. For example, make a separate class for bound methods in
extension types, which would be literally a duplicate of the existing
types.MethodType class (possibly with a different name). In other words,
a bound method of an extension type would work exactly the same way as
an existing bound method but it would artificially be a different class
for the benefit of non-duck-typing.
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