Cython is a subset of Python, while PyPy has shitty C interop if nothing changed from the last time that I checked. Ergo in a general sense Python = CPython. If

Cython is a subset of Python, while PyPy has shitty C interop if nothing changed from the last time that I checked. Ergo in a general sense Python = CPython. If you have specific needs you may want to consider the alternatives, but saying that Cython is Python is at least shady if not completely deceptive.