8000 gh-120170: Exclude __mp_main__ in C version of whichmodule() by li-dan · Pull Request #120171 · python/cpython · GitHub
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gh-120170: Exclude __mp_main__ in C version of whichmodule() #120171

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Merged
merged 2 commits into from
May 23, 2025
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gh-120170: Exclude __mp_main__ in C version of whichmodule() #120171

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gh-120170: Exclude __mp_main__ in C version of whichmodule()
li-dan Jan 29, 2025
9bf9bb3
Merge branch 'main' into fix_120170
lysnikolaou Feb 10, 2025
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2024-06-06-17-49-07.gh-issue-120170.DUxhmT.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix an issue in the :mod:`!_pickle` extension module in which importing
:mod:`multiprocessing` could change how pickle identifies which module an
object belongs to, potentially breaking the unpickling of those objects.
4 changes: 4 additions & 0 deletions Modules/_pickle.c
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Expand Up @@ -1870,6 +1870,10 @@ _checkmodule(PyObject *module_name, PyObject *module,
_PyUnicode_EqualToASCIIString(module_name, "__main__")) {
return -1;
}
if (PyUnicode_Check(module_name) &&
_PyUnicode_EqualToASCIIString(module_name, "__mp_main__")) {
return -1;
}

PyObject *candidate = getattribute(module, dotted_path, 0);
if (candidate == NULL) {
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