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    <p>In my opinion, things like dependency injection are symptoms of a rigid and over-complex framework. When the main body of code becomes much too weighty to change easily, you find yourself having to pick small parts of it, define interfaces for them, and then allowing people to change behaviour via the objects that plug into those interfaces. That's all well and good, but it's better to avoid that sort of complexity in the first place.</p> <p>It's also the symptom of a statically-typed language. When the only tool you have to express abstraction is inheritance, then that's pretty much what you use everywhere. Having said that, C++ is pretty similar but never picked up the fascination with Builders and Interfaces everywhere that Java developers did. It is easy to get over-exuberant with the dream of being flexible and extensible at the cost of writing <a href="http://discuss.joelonsoftware.com/default.asp?joel.3.219431" rel="nofollow noreferrer">far too much generic code with little real benefit</a>. I think it's a cultural thing.</p> <p>Typically I think Python people are used to picking the right tool for the job, which is a coherent and simple whole, rather than the One True Tool (With A Thousand Possible Plugins) that can do anything but offers a bewildering array of possible configuration permutations. There are still interchangeable parts where necessary, but with no need for the big formalism of defining fixed interfaces, due to the flexibility of duck-typing and the relative simplicity of the language.</p>
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    1. POWhy is IoC / DI not common in Python?
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    1. USKylotan
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    1. COYour first point is nonsense.
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    2. CO@Finglas: Which part of it makes no sense? You may disagree with the premises but I think the logic is sound. It also ties with my experience on Python projects - you can swap parts out quickly and easily without any need for the formalised interfaces nor builders to inject one object inside of another.
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    3. COIt isn't so much the framework as the language itself. To create the kind of flexibility that duck-typing languages enjoy, statically typed languages need very sophisticated frameworks and rules. DI is one of those rules. Python folks don't think twice about. Java folks have to really work at it.
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