CPython's NotImplemented Implementation in C
NotImplemented is an immortal static singleton that binary operators return to say ’not my job’ — the interpreter then tries the reflected operand before raising TypeError.
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CPython's object Implementation in C
object is a 16-byte struct holding just ob_refcnt and ob_type — and PyBaseObject_Type fills in the defaults every other type inherits or overrides.
CPython's OrderedDict in C: O(1) Insertion Order That Just Works
OrderedDict is a dict subclass with a linked list of keys and a lazily rebuilt mirror array, giving O(1) node lookup without touching every dict resize.
CPython's pickle.PickleBuffer Implementation in C: Out-of-Band Data Without Copies
PickleBuffer is a tiny C object that holds one Py_buffer view and forwards every buffer request straight to the original exporter — no copies, no managed-buffer layer.
CPython's PyCapsule Implementation in C: A void* Wrapper for Extension Modules
A PyCapsule is a typed, name-checked void* wrapper: the name stops you reading the wrong capsule, and the destructor gets one shot to clean up before the memory goes.