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Title: bpo-28411: Remove PyInterpreterState.modules. by ericsnowcurrently · Pull Request #3606 · python/cpython · GitHub

Open Graph Title: bpo-28411: Remove PyInterpreterState.modules. by ericsnowcurrently · Pull Request #3606 · python/cpython

X Title: bpo-28411: Remove PyInterpreterState.modules. by ericsnowcurrently · Pull Request #3606 · python/cpython

Description: The status quo for sys.modules is broken. While importlib (and a few other places) use sys.modules directly, the C-API (including PyImport_Import(), etc.) use PyInterpreterState.modules directly. Since assigning to sys.modules does not update PyInterpreterState.modules, the two can get out of sync. The workaround, which we use in the test suite, is complicated. This patch resolves the issue by getting rid of PyInterpreterState.modules and making sys.modules authoritative in the C-API. Note that this code was landed earlier (PR #1638), but reverted due to problems when a bogus value (e.g. []) is assigned to sys.modules (see bpo-31404), which is very much a corner case. I've broken that original patch up and already landed the majority. The remaining piece here is to actually drop PyInterpreterState.modules. This PR should not be merged until the problem described in bpo-31404 is resolved. https://bugs.python.org/issue28411

Open Graph Description: The status quo for sys.modules is broken. While importlib (and a few other places) use sys.modules directly, the C-API (including PyImport_Import(), etc.) use PyInterpreterState.modules directly. ...

X Description: The status quo for sys.modules is broken. While importlib (and a few other places) use sys.modules directly, the C-API (including PyImport_Import(), etc.) use PyInterpreterState.modules directly. ...

Opengraph URL: https://github.com/python/cpython/pull/3606

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3920902 Look up sys.modules in PyImport_GetModuleDict(). ericsnowcurrently Oct 7, 2016 https://github.com/python/cpython/pull/3606/commits/3920902cf54118351a5249166e959f568c28a57d
9c8f4dd Check sys.modules in _PyImport_EnsureInitialized(). ericsnowcurrently Oct 10, 2016 https://github.com/python/cpython/pull/3606/commits/9c8f4dd08e193aa8cddfc7f55910a47f92ebc0ca
4e97cbf Drop PyInterpreterState.modules. ericsnowcurrently Oct 7, 2016 https://github.com/python/cpython/pull/3606/commits/4e97cbfeb44de88d5741c2194d996f01b4ab7797
19694f3 Add a Misc/NEWS entry. ericsnowcurrently Sep 4, 2017 https://github.com/python/cpython/pull/3606/commits/19694f380888fd694b91039545ed92a0f8dbc95c
548428c Add a whatsnew entry for porting. ericsnowcurrently Sep 4, 2017 https://github.com/python/cpython/pull/3606/commits/548428c6f6abd18afe28acf148e905fb31c5bfa3
b31768e Use PyImport_GetModuleDict() in pickle. ericsnowcurrently Sep 15, 2017 https://github.com/python/cpython/pull/3606/commits/b31768e0cfb1ea1b8ab1d88789083febf7f93c08
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