/usr/bin/python3 is technically preinstalled, but it’s just a stub that looks up the currently selected Xcode installation and execs the real python3 from there

/usr/bin/python3 is technically preinstalled, but it’s just a stub that looks up the currently selected Xcode installation and execs the real python3 from there. (Same as /usr/bin/clang, /usr/bin/swift, and so on.)