CPython's Iterator Implementation in C
A for loop compiles to PyObject_GetIter plus repeated tp_iternext calls — two C function pointers, no Python-level dispatch for built-in types.
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CPython's LazyImport Implementation in C
Lazy imports work by parking a proxy object in the namespace and atomically replacing it with the real module the first time the name is touched.
CPython's list Implementation in C
CPython’s list is a contiguous array of pointers with a separate size and capacity, growing by about an eighth each time so appends stay O(1) amortized.
CPython's memoryview Implementation in C
CPython splits memoryview into a shared managed-buffer snapshot and a per-view copy of shape/strides, so slicing adjusts pointers instead of copying data.
CPython's Module Implementation in C
A Python module is a PyModuleObject with a dict as its namespace, plus optional per-module C state — and its tp_getattro is where lazy imports get resolved.