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Commit4b99d39

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gh-120170: Exclude __mp_main__ in C version of whichmodule()
Importing multiprocessing adds an alias to __main__ named __mp_main__.In#23403, the Python version of whichmodule() was fixed to exclude__mp_main__. Apply the same fix to the C version of the function.
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Fix an issue in the:mod:`!_pickle` extension module in which importing
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:mod:`multiprocessing` could change how pickle identifies which module an
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object belongs to, potentially breaking the unpickling of those objects.

‎Modules/_pickle.c

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@@ -1888,6 +1888,10 @@ _checkmodule(PyObject *module_name, PyObject *module,
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_PyUnicode_EqualToASCIIString(module_name,"__main__")) {
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return-1;
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}
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if (PyUnicode_Check(module_name)&&
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_PyUnicode_EqualToASCIIString(module_name,"__mp_main__")) {
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return-1;
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}
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PyObject*candidate=get_deep_attribute(module,dotted_path,NULL);
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if (candidate==NULL) {

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