[issue3263] Odd code fragment in ABC definitions

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

There are tons of ways to violate Liskov in Python. Liskov is not always
the right rule.

NotImplemented is not appropriate -- it is only used as a magic return
value from binary functions.

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resolution:  -> rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3263>
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