Recently I am learning Python C API.
When I read the tutorial
<https://docs.python.org/3/extending/newtypes.html#the-basics>, defining
new types, I feel confused. After PyType_Ready(&noddy_NoddyType) comes
Py_INCREF(&noddy_NoddyType). Actually noddy_NoddyType is a static struct
so I don't understand why I need to Py_INCREF it. Since it's
Py_INCREFed, does it mean sometimes we also need to Py_DECREF it? But
then it seems that type_dealloc will be invoked and it will fail
assert(type->tp_flags & Py_TPFLAGS_HEAPTYPE);
I haven't read the typeobject.c source code totally so I think I must
have missed something. But I am quite confused. Hope someone can give me
some hints. Thanks in advance.
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