> Why is it a problem that python calls out to other languages as needed? There is not problem if a) someone has written that code in the other language alread

> Why is it a problem that python calls out to other languages as needed? There is not problem if a) someone has written that code in the other language already and b) it works correctly. But it's harder to build, modify and debug these things, generally. Glue code is useful, but it definitely has a cost.