do
rm /usr/bin/python3
ln -s /usr/bin/python3.6 /usr/bin/python3
much better solution:
Damn, Python is used throughout much of Ubuntu for system scripts and software, and software relies on having Python (and the commands to start Python) in a certain spot. do back then.
rm /usr/bin/python3
ln -s /usr/bin/python3.5 /usr/bin/python3
create alias in ~/.bash_aliases
alias python3='/usr/bin/python3.6'
Scripts can then start with something like:
#!/usr/bin/env python3