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> And don't even get me started with dependency injection in Python.

Could I get you started? Or could you point me to a place to get myself started? I primarily code in Python and I've found dependency injection, by which I mean giving a function all the inputs it needs to calculate via parameters, is a principle worth designing projects around.



Here’s 1% that gives 50% of result. Replace:

    class C:
        def __init__(self):
            self.foo = ConcreteFoo()
with:

   class C:
        def __init__(self, foo: SupportsFoo):
            self.foo = foo
where SupportsFoo is a Protocol. That’s it.




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