Add star imported modules as dependencies #6179
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(I manually verified that this fixes the mypy crashes discovered in our internal codebases.) |
msullivan
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Jan 11, 2019
This was referenced Apr 11, 2025
hauntsaninja
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Apr 11, 2025
Fixes #12664 A root cause is there is this stateful `_update_ns_ancestors` thing in `modulefinder`, so if things get called in the wrong order, you can get incorrect results. See also the logic in `all_imported_modules_in_file` where we've fixed several bugs like this previously, like #13124 and #10937 As a result of (seemingly accidentally) reusing imports across modules, we can end up in a situation where the namespace gets added as a dependency to all other modules and so on the cached run we attempt to find namespace before package, which does not work I am not sure this `imports` code path is even needed, so I will open an alternate PR, see #18908. Relevant history: - #6582 - #6179 I can't write a good test for this because it requires something in site_packages, but here's a minimal repro: ``` set -eux rm -rf repro mkdir repro cd repro SITEPACK=env/site-packages mkdir -p $SITEPACK mkdir $SITEPACK/ruamel mkdir $SITEPACK/ruamel/yaml printf 'from ruamel.yaml.main import *' > $SITEPACK/ruamel/yaml/__init__.py printf 'import ruamel.yaml' > $SITEPACK/ruamel/yaml/main.py printf '' > $SITEPACK/ruamel/yaml/py.typed printf 'import ruamel.yaml' > a.py printf 'import a' > main.py rm -rf .mypy_cache PYTHONPATH=$SITEPACK mypy main.py PYTHONPATH=$SITEPACK mypy main.py ```
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Fixes #6110
I tried few approaches, and this one seems the most clean to me. Essentially, we just add some more imports (dependencies) after the second pass, where the star imports are resolved.