Your argument doesn’t work. Python affords you tools like metaclasses, __instancecheck__, __subclasshook__, properties and descriptors exactly so you can use th

Your argument doesn’t work. Python affords you tools like metaclasses, __instancecheck__, __subclasshook__, properties and descriptors exactly so you can use the type system to determine how duck typing is handled in whatever cases you want. Using inheritance and metaprogramming to enforce how and when a given instance or class object satisfies the contract of some interface is a core, fundamental, first-class aspect of Python. Just because you don’t need to use it very often doesn’t mean “it’s the wrong choice for Python” or anything like that at all. It is a thing Python goes way out of its way to enthusiastically support, so therefore it is absolutely a Pythonic way to solve problems.