From the course: Learning SOLID Programming Principles

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Duck Typing

Duck Typing - Python Tutorial

From the course: Learning SOLID Programming Principles

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Duck Typing

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- The Python language does not require a formal definition of an abstract super class. And while it often makes sense to use the abc module to define super classes for abstractions, we have two alternatives. I like to call these "informal subclassing". Because of Python's duck typing, it's not essential to have a single abstract super class. Duck typing means the code doesn't have to follow a strict inheritance hierarchy. If you haven't heard the term "duck typing" before, it comes from this: When I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck. If two Python objects have the same methods and attributes, well, then for all practical purposes in Python they may as well be members of the same class. Python doesn't rely on the declared type, but on the presence of methods and attributes. Tools like mypy will check to confirm that classes used interchangeably really…

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