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In term of API, we get something like:
 _PyInitError err;
 _PyPreConfig preconfig = _PyPreConfig_INIT;
 preconfig.utf8_mode = 1;
 preconfig.allocator = "malloc";
 _PyInitError err = _Py_PreInitializeFromPreConfig(&preconfig);
 if (_Py_INIT_FAILED(err)) {
 _Py_ExitInitError(err);
 }
 /* PyMem_RawMalloc and Py_DecodeLocale can now be used */
 _PyCoreConfig config = _PyCoreConfig_INIT;
 config.user_site_directory = 0;
 err = _Py_InitializeFromConfig(&config);
 if (_Py_INIT_FAILED(err)) {
 _Py_ExitInitError(err);
 }
 /* ... use Python ... */
 Py_Finalize();
 /* Note: no need to "free" preconfig nor config memory, they use constants */