You have Python 3 installed, but you do not have pip3 installed. One of the following also apply to your situation:
Problem scenario #1
You run an Ansible playbook. You receive the error message "Aborting, target uses selinux but python bindings (libselinux-python) aren't installed."
Problem scenario #2
You run an Ansible playbook. You receive the error message "module 'selinux' has no attribute 'is_selinux_enabled'".
What should you do?
Assuming you pip has been installed, do the following:
1. Run this command (where /path/to is the directory path to where pip is installed):
sudo /path/to/pip install --upgrade pip
2. Run this command:
sudo pip3 install selinux
You are done.
If you cannot install pip (and it is not installed), see this posting How Do You Get the libselinux-python to Work with Python 3?.