---
- name: install and check python
  hosts: all
  become: no
  gather_facts: yes


  vars:
    install_pkgs: yes


  tasks:
    - name: Debug python interpreter
      debug:
        var: ansible_python_interpreter


    - name: Install python packages
      package:
        name  : "{{ item }}"
        state : present
      with_items:
        - python2
        - python3
      when:
        - install_pkgs|bool


    - name: Check python version
      command: "{{ ansible_python_interpreter }} --version"
      register: r_python_version


    - name: Show python 2 version
      debug:
        var: r_python_version.stderr
      when: r_python_version.stderr != ""


    - name: Show python 3 version
      debug:
        var: r_python_version.stdout
      when: r_python_version.stdout != ""


...