Files
RustPython/Lib/test
Kwak Byoung Min 2ffde783fc Fix csv.writer QUOTE_NONE with quotechar=None (#8201)
* Prevent csv QUOTE_NONE writer panics without quotechar

Handle csv.writer rows with QUOTE_NONE through a RustPython-owned unquoted writer path so quotechar=None no longer reaches the unfinished csv_core configuration branch. Escape delimiter, newline, quotechar, and escapechar bytes according to the active dialect, and preserve CPython's single-empty-field error behavior.

Constraint: Match CPython csv.writer behavior without changing Lib/ copied stdlib files.
Rejected: Relying on csv_core QuoteStyle::Never | it does not model CPython QUOTE_NONE escaping with quotechar=None.
Confidence: high
Scope-risk: narrow
Directive: Keep QUOTE_NONE writer behavior separate unless csv_core gains matching CPython semantics.
Tested: prek run --all-files; cargo test --workspace --exclude rustpython_wasm --exclude rustpython-venvlauncher; cargo build --release --features sqlite; pytest -v in extra_tests
Assisted-by: Codex:gpt-5.5

* Keep csv parity tests aligned with QUOTE_NONE support

Remove the stale RustPython expected-failure marker for the CPython escaped-field writer test that now passes, and cover CR/LF escaping in the snippet regression requested during review.

Constraint: RustPython test policy allows removing expectedFailure markers only when the upstream test passes.

Rejected: Refactoring writer row boilerplate in this follow-up | review marked it as a heavy-lift nitpick and it would broaden the CI fix.

Confidence: high

Scope-risk: narrow

Tested: cargo run --release --features sqlite -- -m test test_csv; cargo run -- extra_tests/snippets/stdlib_csv.py; PATH=/tmp/pyshim:$PATH prek run --all-files; git diff --check; cargo test --workspace --exclude rustpython_wasm --exclude rustpython-venvlauncher; pytest -v in extra_tests

Assisted-by: Codex:gpt-5.5

* Keep csv quote-style dispatch coherent

Review feedback pointed out that adjacent branches selected behavior from the same quoting discriminator. Use one match so future quote-style additions are routed in a single place.

Constraint: RustPython review requested merging adjacent quote-style checks.
Confidence: high
Scope-risk: narrow
Tested: cargo fmt --check
Tested: target/release/rustpython extra_tests/snippets/stdlib_csv.py
Tested: target/release/rustpython -m test test_csv
Tested: PATH=/tmp/pyshim:$PATH prek run --all-files
Tested: RUST_TEST_THREADS=1 cargo test --workspace --exclude rustpython_wasm --exclude rustpython-venvlauncher -- --test-threads=1
Tested: cargo clippy --workspace --exclude rustpython_wasm --exclude rustpython-venvlauncher --all-targets
Assisted-by: Codex:gpt-5.5
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