Ansible – How to use a variable in a variable name

1. - name: Show value of 'variablename'
2. debug: msg="{{ lookup('vars', 'variabl' + myvar)}}"
3. vars:
4. variablename: hello
5. myvar: ename
7. - name: Show default empty since i dont have 'variablnotename'
8. debug: msg="{{ lookup('vars', 'variabl' + myvar, default='')}}"
9. vars:
10. variablename: hello
11. myvar: notename
13. - name: Produce an error since i dont have 'variablnotename'
14. debug: msg="{{ lookup('vars', 'variabl' + myvar)}}"
15. ignore_errors: True
16. vars:
17. variablename: hello
18. myvar: notename
20. - name: find several related variables
21. debug: msg="{{ lookup('vars', 'ansible_play_hosts', 'ansible_play_batch', 'ansible_play_hosts_all') }}"
23. - name: alternate way to find some 'prefixed vars' in loop
24. debug: msg="{{ lookup('vars', 'ansible_play_' + item) }}"
25. loop:
26. - hosts
27. - batch
28. - hosts_all

- name: Show value of 'variablename'
  debug: msg="{{ lookup('vars', 'variabl' + myvar)}}"
  vars:
    variablename: hello
    myvar: ename

- name: Show default empty since i dont have 'variablnotename'
  debug: msg="{{ lookup('vars', 'variabl' + myvar, default='')}}"
  vars:
    variablename: hello
    myvar: notename

- name: Produce an error since i dont have 'variablnotename'
  debug: msg="{{ lookup('vars', 'variabl' + myvar)}}"
  ignore_errors: True
  vars:
    variablename: hello
    myvar: notename

- name: find several related variables
  debug: msg="{{ lookup('vars', 'ansible_play_hosts', 'ansible_play_batch', 'ansible_play_hosts_all') }}"

- name: alternate way to find some 'prefixed vars' in loop
  debug: msg="{{ lookup('vars', 'ansible_play_' + item) }}"
  loop:
    - hosts
    - batch
    - hosts_all