If you are not familiar with modules, check out Ansible - Getting Started with Modules.

Typically, the shell, command, or script modules are used to invoke a command on a managed node (e.g. target systems).

Python (e.g. /usr/bin/python) needs to exist on the managed node to use these modules.

• shell
• command

Python is not needed to use these modules. 

• script
• raw (this article)

---
- hosts: all
  tasks:
  - name: install Python using raw
    raw: yum -y install python
...

If changed is displayed, this means that Python was successfully installed on the control node (e.g. the target host).

TASK [install Python using raw]
changed: [server1.example.com]