The Python function is implemented in C and uses a faster algorithm [1], and this particular factorial is so small they put it in a lookup table [2]. It is a strange and very unequal choice for a demo.

[1] https://github.com/python/cpython/blob/0d9d48959e050b66cb37a...

[2] https://github.com/python/cpython/blob/0d9d48959e050b66cb37a...