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Python remembers SWIG types because SWIG generates code like this:
PyTypeObject * SwigPyObject_TypeOnce(void) {
 static PyTypeObject swigpyobject_type;
 static int type_init = 0;
 if (!type_init) {
 // ... initialization code ...
 swigpyobject_type = tmp;
 type_init = 1;
 if (PyType_Ready(&swigpyobject_type) < 0)
 return NULL;
 }
}
SWIG should reset "type_init" on a fresh interpreter.
The initXxx() function should do this.