[czardoz]

One minor clarification here: Cinder[1] is actually 100% compatible with C extensions (by virtue of being a fork of CPython).

[1]: https://github.com/facebookincubator/cinder

[tekknolagi]

Guido appears to have meant to refer to Skybison (https://github.com/facebookexperimental/skybison), which is not 100% compatible.