List available python options
ls -larth `which python`*
lrwxrwxrwx 1 root root 10 Mar 23 2016 /usr/bin/python3m -> python3.5m
lrwxrwxrwx 1 root root 9 Mar 23 2016 /usr/bin/python3 -> python3.5
lrwxrwxrwx 1 root root 9 Nov 24 2017 /usr/bin/python2 -> python2.7
lrwxrwxrwx 1 root root 9 Nov 24 2017 /usr/bin/python -> python2.7
-rwxr-xr-x 2 root root 4.3M Nov 28 2017 /usr/bin/python3.5m
-rwxr-xr-x 2 root root 4.3M Nov 28 2017 /usr/bin/python3.5