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idiomatic Python dictates that you (almost) never do type-checking, but instead rely on duck-typing for polymorphic behavior. There's nothing wrong with using isinstance to understand inheritance, but it should generally be avoided in "production" code

keyword arguments with default values can go a long way.

In Python, I think it's more accepted to use duck typing -- asking what an object can do, rather than what it is

it goes against the spirit of Python to worry a lot about what types are passed into methods