root@x1:~# dpkg-query --show | grep python[^3[
grep: Unmatched [ or [^
root@x1:~# dpkg-query --show | grep python[^3]
dh-python	2.20151103ubuntu1
python-apt-common	1.1.0~beta1build1
root@x1:~# python2
The program 'python2' is currently not installed. You can install it by typing:
apt install python-minimal