https://www.pypy.org/
https://www.pypy.org/download.html
https://doc.pypy.org/en/latest/introduction.html

2021
https://towardsdatascience.com/run-your-python-code-as-fast-as-c-4ae49935a826
    https://nuancesprog.ru/p/14989/
2020
https://realpython.com/pypy-faster-python/
    https://proglib.io/p/pypy-uskoryaem-python-s-minimalnymi-usiliyami-2020-11-26