Ansible offers two keywords for creating loops: loop and with_<lookup>.
$ vim create-users.yml
---
- name: Create New Users
hosts: all
gather_facts: false
tasks:
- name: Create Users Task
user:
name: "{{ item }}"
state: present
password: "{{ default_user_password | password_hash('sha512', 'A512') }}"
shell: /bin/bash
groups: "{{ admin_group }}"
append: true
loop:
- bob
- wendy
- lofty
- dizzy
...