[Python-3000] C API for ints and strings

["Martin v. Löwis"]

> I actually need to convert it to mpz_t, which is best done via text
> in a C string in a base which is a power of 2. Since PyUnicode_Format
> for Python3 int creates a byte string first, it's quite silly to let
> a byte string be converted to a Unicode string and then back.

You could use _PyLong_AsByteArray.

Regards,
Martin