Slide 7
Slide 7 text
Don’t check whether it is-a duck:
check whether it quacks-like-a duck,
walks-like-a duck, etc, etc,
depending on exactly what subset
of duck-like behavior you need [...]
— Alex Martelli in comp-lang-python, 2000-07-26
"polymorphism (was Re: Type checking in python?)"
source: https://mail.python.org/pipermail/python-list/2000-July/046184.html
Duck
typing
defined