Some uses in apt will have python3 then have python3-3.4 subdivision but usually that's because an update broke something and it's usually removed when the issu

Some uses in apt will have python3 then have python3-3.4 subdivision but usually that's because an update broke something and it's usually removed when the issue is resolved (also this is distro specific) I don't know if brew does anything like this however, but I know in the apt environment that's usually how multiple versioning is done.