6 ms·

So are there downsides to just always setting slots=True on all of my python data types?

• itamarst 1y ago
  You can't add extra attributes that weren't part of the original dataclass definition: >>> from dataclasses import dataclass >>> @dataclass ... class C: pass ... >>> C().x = 1 >>> @dataclass(slots=True) ... class D: pass ... >>> D().x = 1 Traceback (most recent call last): File "<python-input-4>", line 1, in <module> D().x = 1 ^^^^^ AttributeError: 'D' object has no attribute 'x' and no __dict__ for setting new attributes Most of the time this is not a thing you actually need to do.
  • masklinn 1y ago
    Also some of the introspection stops working e.g. vars(). If you're using dataclasses it's less of an issue because dataclasses.asdict.
  • monomial 1y ago
    I rarely need to dynamically add attributes myself on dataclasses like this but unfortunately this also means things like `@cached_property` won't work because it can't internally cache the method result anywhere.
    • franga2000 1y ago
      IIRC you can just include a __dict__ slot and @cached_property should start working again. I