Templating vars

Output

$ ansible-playbook -i deploy_conf/localhost -vvv -e group=test test.yml
1 plays in test.yml

PLAY: ***************************************************************************

TASK [debug msg={{ my_var }}] ***************************************************
fatal: [localhost]: FAILED! => {"msg": "ERROR! the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'my_var' is undefined", "failed": true}

NO MORE HOSTS LEFT **************************************************************

PLAY RECAP **********************************************************************
localhost                  : ok=0    changed=0    unreachable=0    failed=1

test

---
my_var: "Testing 123"

test.yml

---
- hosts: localhost
  connection: local
  gather_facts: false
  vars_files:
    - group_vars/{{ group }}
  tasks:
    - debug: msg="{{ my_var }}"