getpath miscalculates sys.path from second initialization with PYTHONHOME on Windows · Issue #91985 · python/cpython (original) (raw)

When I ran the code below in a python build directory:

#include <Python.h>
int
main(int argc, char *argv[])
{
    PyConfig config;
    PyConfig_InitPythonConfig(&config);
    for (int i=0; i < 3; i++) {
        printf("\n%d\n", i);
        Py_InitializeFromConfig(&config);
        PyRun_SimpleString("import sys; list(map(print, sys.path))");
        Py_Finalize();
    }
    PyConfig_Clear(&config);
    return 0;
}

• Expected results without PYTHONHOME:

0
C:\cpython-main\PCbuild\amd64\python311.zip
C:\cpython-main\Lib
C:\cpython-main\PCbuild\amd64
C:\cpython-main
C:\cpython-main\Lib\site-packages

1
C:\cpython-main\PCbuild\amd64\python311.zip
C:\cpython-main\Lib
C:\cpython-main\PCbuild\amd64
C:\cpython-main
C:\cpython-main\Lib\site-packages

2
C:\cpython-main\PCbuild\amd64\python311.zip
C:\cpython-main\Lib
C:\cpython-main\PCbuild\amd64
C:\cpython-main
C:\cpython-main\Lib\site-packages

• set PYTHONHOME=C:\cpython-main:

0
C:\cpython-main\PCbuild\amd64\python311.zip
C:\cpython-main\Lib
C:\cpython-main\PCbuild\amd64
C:\cpython-main
C:\cpython-main\Lib\site-packages

1
C:\cpython-main\PCbuild\amd64\python311.zip
C:\cpython-main\Lib
C:\cpython-main\DLLs  # <<<<<<<<<< unexpected
C:\cpython-main
C:\cpython-main\Lib\site-packages

2
C:\cpython-main\PCbuild\amd64\python311.zip
C:\cpython-main\Lib
C:\cpython-main\DLLs  # <<<<<<<<<< unexpected
C:\cpython-main
C:\cpython-main\Lib\site-packages

Currently, test_embed fails due to this. (#32313)