[Python-ideas] check interfaces, isducktype(X, A)

[Gregory Salvan]

Hi,
I've made a try of a function that check object/class members for duck
typing.

For now I've basically called it isducktype(X, A)
it returns true if:
- X has all attributes of A
- X methods have same number of arguments than corresponding A methods

or if A.__ducktypecheck__(X) returns True

Behaviour looks like isinstance and issubclass (support tuples...).

To test it:
The patch with example is here:
https://gist.github.com/apieum/7751279

Or you can use my branch here:
https://bitbucket.org/gsalvan/cpython/commits/branch/default


Any opinion about a feature like this ?
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