no alternatives for python

[Bump]

Some scripts just call python when they mean python3 or python2. I don't know if it's a good practice to symlink python to python3/python2 or you are expected to explicitly call python3/2 when you want it.

update-alternatives --list python
update-alternatives: error: no alternatives for python

ls /usr/bin/python?
/usr/bin/python2 /usr/bin/python3

[Kai Kasurinen (kai-kasurinen)]

In Ubuntu, all python packages use explicit python3 or python2
interpreter and do not use unversioned /usr/bin/python at all.
Some third-party code may still be python2 based, yet may use
/usr/bin/python.

https://launchpad.net/ubuntu/+source/what-is-python
https://launchpad.net/ubuntu/+source/what-is-python/4

[Kai Kasurinen (kai-kasurinen)]

python-is-python3 - symlinks /usr/bin/python to python3
python-is-python2 - symlinks /usr/bin/python to the DEPRECATED python2

[Bump (bump55)]

I don't think it's a good idea to mess with system defaults. Plus if you call the ./script directly it should have already a shebang line with python version.
So python is just for backward compatibility with python2 scripts.