can i obtain a student visa (for language course) while on a visit visa?

Hello all,

i'm currently in Switzerland on a visit visa, (i'm a third-country citizen)
i wish to take up a french language course so the question is:

1-can i enroll and change obtain a student visa while in the country (even if it requires exiting and coming back)

2-can a student visa be issued for a language course (french) ?

i would highly appreciate a solid answer

thanks in advance

Zed.