[ty] Track literal iterable emptiness for reachability#25222
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Typing conformance resultsNo changes detected ✅Current numbersThe percentage of diagnostics emitted that were expected errors held steady at 94.47%. The percentage of expected errors that received a diagnostic held steady at 89.19%. The number of fully passing files held steady at 95/134. |
Memory usage reportSummary
Significant changesClick to expand detailed breakdownprefect
trio
flake8
sphinx
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| Lint rule | Added | Removed | Changed |
|---|---|---|---|
possibly-unresolved-reference |
0 | 124 | 0 |
unresolved-attribute |
0 | 3 | 0 |
not-iterable |
0 | 2 | 0 |
invalid-assignment |
0 | 1 | 0 |
possibly-missing-import |
0 | 1 | 0 |
| Total | 0 | 131 | 0 |
Flaky changes detected. This PR summary excludes flaky changes; see the HTML report for details.
Raw diff (131 changes)
black (https://github.com/psf/black)
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cloud-init (https://github.com/canonical/cloud-init)
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colour (https://github.com/colour-science/colour)
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core (https://github.com/home-assistant/core)
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cryptography (https://github.com/pyca/cryptography)
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ibis (https://github.com/ibis-project/ibis)
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jax (https://github.com/google/jax)
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mypy (https://github.com/python/mypy)
- mypyc/irbuild/format_str_tokenizer.py:28:55 warning[possibly-missing-import] Member `int_to_str_op` of module `mypyc.primitives.int_ops` may be missing
pandas (https://github.com/pandas-dev/pandas)
- pandas/tests/frame/indexing/test_take.py:48:13 warning[possibly-unresolved-reference] Name `df` used when possibly not defined
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pandera (https://github.com/pandera-dev/pandera)
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poetry (https://github.com/python-poetry/poetry)
- src/poetry/repositories/link_sources/html.py:63:77 warning[possibly-unresolved-reference] Name `metadata` used when possibly not defined
psycopg (https://github.com/psycopg/psycopg)
- tools/update_error_prefixes.py:75:22 warning[possibly-unresolved-reference] Name `default_pgroot` used when possibly not defined
pycryptodome (https://github.com/Legrandin/pycryptodome)
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pydantic (https://github.com/pydantic/pydantic)
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pywin32 (https://github.com/mhammond/pywin32)
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rotki (https://github.com/rotki/rotki)
- rotkehlchen/tests/api/test_bitcoin_transactions.py:102:12 warning[possibly-unresolved-reference] Name `events` used when possibly not defined
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scikit-learn (https://github.com/scikit-learn/scikit-learn)
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scipy (https://github.com/scipy/scipy)
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spack (https://github.com/spack/spack)
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spark (https://github.com/apache/spark)
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static-frame (https://github.com/static-frame/static-frame)
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sympy (https://github.com/sympy/sympy)
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- sympy/printing/pretty/pretty.py:1498:22 error[unresolved-attribute] Attribute `height` is not defined on `None` in union `None | Unknown | prettyForm`
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- sympy/utilities/tests/test_iterables.py:416:39 warning[possibly-unresolved-reference] Name `nul` used when possibly not defined
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tornado (https://github.com/tornadoweb/tornado)
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vision (https://github.com/pytorch/vision)
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- torchvision/models/feature_extraction.py:601:87 warning[possibly-unresolved-reference] Name `name` used when possibly not defined
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carljm
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Jun 25, 2026
| { | ||
| let after_iter = self.flow_snapshot(); | ||
| let constraint = self | ||
| .record_reachability_constraint(PredicateOrLiteral::Literal(is_non_empty)); |
Contributor
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I think this PR can be significantly simpler. There's no need to create a node in the reachability TDD for a reachability decision that we can make with full confidence immediately in semantic indexing. For these cases we can instead just merge or not-merge control flow snapshots directly here. I think the pattern here should be: "what is the known emptiness of the iterator? if empty, mark loop body unreachable and restore post-iterator snapshot before visiting else. if non-empty, visit body normally and do not merge zero-iteration path back in. if unknown, then we check for possibly adding a range constraint node, and proceed as main currently does."
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Good call, thank you!
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|
|
||
| ```py | ||
| def _(items: list[int], mapping: dict[str, int]): | ||
| for item in [*items]: |
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It looks like we are smart about the fact that [*items, 1] is known non-empty (and similar for e.g. {*mapping, "c": 2}), but this is currently not tested.
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Summary
This extends the static reachability analysis for synchronous
forloops from #25220 to tuple, list, set, dictionary, string, and bytes literals whose emptiness is known syntactically. We record their static truthiness: a non-empty literal proves that the body executes at least once, while an empty literal marks the body unreachable and prevents its definitions from flowing past the loop.Starred elements and dictionary unpacking remain ambiguous when they are the only elements, while an explicit element still proves non-emptiness. Other iterables continue on the existing ambiguous path. Synchronous literals used in
async fordo not use this shortcut because they do not satisfy async iteration.