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

The parted module can be used to create a remove a partition on a storage device. Let's say the /dev/sdb storage device has not yet been configured with a parition. The following playbook would create the /dev/sdb1 partition on the storage device, using all of the available storage on the disk for the new partition.

AVOID TROUBLE

The modification of a partition can only be done by root or a user or group that has been granted sudo access. Refer to beome / sudo to understand how to run a playbook as root or with become (sudo) permission.

---
- hosts: all
  tasks:
    - name: create the /dev/sdb1 partition
      parted:
        device: /dev/sdb
        number: 1
        part_start: "0%"
        part_end: "100%"
        state: present
...

Instead of using part_start: 0% and part_end: 100%, which uses all of the available space on the disk for the partition, you could specify the amount of space you want allocated for the partition, such as 1 GB.

---
- hosts: all
  tasks:
    - name: create a 1 GB /dev/sdb1 partition
      parted:
        device: /dev/sdb
        number: 1
        part_start: 1GiB
        state: present
...

The flags option can be used to set a partition type, such as setting a partition type to swap or LVM.

---
- hosts: all
  tasks:
    - name: create a 1 GB /dev/sdb2 swap partition
      parted:
        device: /dev/sdb
        number: 2
        part_start: 1GiB
        flags: [ swap ]
        state: present
...