[issue39462] DataClass typo-unsafe attribute creation & unexpected behaviour (dataclasses)

[Marcel]

Marcel <mpv.visser at gmail.com> added the comment:

The demo-script also needs:

"from dataclasses import dataclass"

Sorry about this omission, I've attached the update

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Added file: https://bugs.python.org/file48866/bug_demo_dataclass_typo_unsafe.py

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<https://bugs.python.org/issue39462>
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