All good ones. I'll add this because A: It's common in Python, and B: There are suitable alternatives in the standard library:
Conflating key/value lookups (dicts) with structured data (classes). They are both useful tools, but are for different purposes. Many python programmers (Myself many years ago included!) misused dicts when they should have been using dataclasses.
Everything in the codebase I maintain at my job is an arbitrary dict and there is no type information anywhere. It wasn't even written that long ago (dataclasses were a thing long before this codebase was written).
There's actually a place where the original authors subclassed dict, and dynamically generate attributes of a "data class" such that it can be used with dotted attribute access syntax or dict access syntax but the `__slots__` attribute of these classes is also generated dynamically so you don't have any auto-complete when trying the dotted attribute access. It's genuinely insane lol.