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I searched for "_PyObject_DebugMallocStats" in top 5000 PyPI projects. There is a single project using it: guppy3.
Extract of guppy3 src/heapy/xmemstats.c:
...
 dlptr__PyObject_DebugMallocStats = addr_of_symbol("_PyObject_DebugMallocStats");
...
static PyObject *
hp_xmemstats(PyObject *self, PyObject *args)
{
 if (dlptr__PyObject_DebugMallocStats) {
 fprintf(stderr, "======================================================================\n");
 fprintf(stderr, "Output from _PyObject_DebugMallocStats()\n\n");
 dlptr__PyObject_DebugMallocStats(stderr);
 }
 ...
}
addr_of_symbol() is implemented with dlsym() or GetModuleHandle(NULL)+GetProcAddress(): it searchs for the symbol in the current process.