capable.core219.predicate

Return callable predicate function from Python lambda expression.

Parameters

`_terms` (required)

Required: yes

One term is required. Python lambda expression string. Example lambda x: x % 2 == 0

`on_error`

Type: str · Default: false · Choices: false | fail

Controls behavior when predicate execution fails or does not return bool. false, given as string or boolean, returns False for that predicate call. fail raises plugin error.

Examples

- name: Return predicate function and use in playbook
  vars:
    is_even: "{{ lookup('capable.core219.predicate', 'lambda x: x % 2 == 0') }}"
  ansible.builtin.assert:
    that:
      - is_even(4) is sameas true
      - is_even(5) is sameas false

- name: Fail through on predicate failure
  vars:
    will_fail: "{{ lookup('capable.core219.predicate', 'lambda x: 1 / x > 0', on_error='fail') }}"
  ansible.builtin.debug:
    msg: "{{ will_fail(0) }}"

Return Values

`data`

Type: raw

Callable predicate function object.

Authors

Kirill Satarin (@kksat)