feat: error for Final fields with init=False (#13119) #20382
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Test cases from PR python#14285, thanks to @jakezych. Co-Authored-By: Jake Zych <56098501+jakezych@users.noreply.github.com> Co-Authored-By: Rafael Christof <rafaeldana@danatelecom.com>
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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This Pull Request adds an error report when a dataclass field is declared as
Final, hasinit=False, and lacks a default value, as discussed in Issue #13119. This change adds a check to detect this combination while avoiding complex control flow analysis, as requested. It also flags no error if there's a__post_init__method, to avoid possible false positives.Test cases were adapted from PR #14285. I also added a new test case for default values provided on the field declaration.
Thanks to @jakezych for the original test cases.
Fixes #13119