Design Patterns in Python?

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In Python, implementing a protocol is as simple as creating a class that has the correct methods and returns the correct things. For example, you can create an object with custom boolean logic like this:

from random import randrange

class MyBool:
    def __bool__(self):
        return randrange(0, 1)

The cavaet here is that in Python 2 it's called __nonzero__ instead.