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Using a very common utility in the standard library is to avoid reinventing the wheel is not "clean code"?

defaultdict is ubiquitous in modern python, and is far from a complicated concept to grasp.

I don't think that's the right metaphor to use here, it exists at a different level than what I would consider "reinventing the wheel". That to me is more some attempt to make a novel outward-facing facet of the program when there's not much reason to do so. For example, reimplementing shared memory using a custom kernel driver as your IPC mechanism, despite it not doing anything that shared memory doesn't already do.

The difference between the examples is so trivial I'm not really sure why the parent comment felt compelled to complain.

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