There is one book about the CPython internals: https://realpython.com/products/cpython-internals-book/ https://realpython.com/products/cpython-internals-book/.

There is one book about the CPython internals: https://realpython.com/products/cpython-internals-book/ https://realpython.com/products/cpython-internals-book/. You can also explore the CPython dev guides: https://devguide.python.org/internals/ https://devguide.python.org/internals/.