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Title: docs(skills): add dataclass-over-NamedTuple guideline to usethis-python-functions skill by Copilot · Pull Request #1882 · usethis-python/usethis-python · GitHub

Open Graph Title: docs(skills): add dataclass-over-NamedTuple guideline to usethis-python-functions skill by Copilot · Pull Request #1882 · usethis-python/usethis-python

X Title: docs(skills): add dataclass-over-NamedTuple guideline to usethis-python-functions skill by Copilot · Pull Request #1882 · usethis-python/usethis-python

Description: Agents defaulted to NamedTuple for structured return types despite it leaking unintended tuple semantics (positional indexing, iteration, unpacking, positional equality). @dataclass is the correct default for grouping named fields. Changes usethis-python-functions skill (v1.3 → v1.4): adds a new "Prefer dataclasses over NamedTuples for structured types" section covering: Why NamedTuple is the wrong default (tuple semantics leak implementation details) When NamedTuple is genuinely appropriate (positional comparison, iteration, interop with tuple-expecting code) Canonical example contrasting the two approaches Common mistakes (choosing NamedTuple for brevity or speculative future unpacking) # Bad: positional indexing silently works; fragile on field reorder class Result(NamedTuple): stdout: str stderr: str result[0] # compiles and runs; wrong if fields ever reorder # Good: only named access available @dataclass class Result: stdout: str stderr: str result.stdout # explicit and refactor-safe Placed in usethis-python-functions alongside the existing "Avoid returning tuples" section, which already recommends dataclasses as the structured alternative.

Open Graph Description: Agents defaulted to NamedTuple for structured return types despite it leaking unintended tuple semantics (positional indexing, iteration, unpacking, positional equality). @dataclass is the correct ...

X Description: Agents defaulted to NamedTuple for structured return types despite it leaking unintended tuple semantics (positional indexing, iteration, unpacking, positional equality). @dataclass is the correct ...

Opengraph URL: https://github.com/usethis-python/usethis-python/pull/1882

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