Running a local script on local host with Ansible

I have a python script which is able to retrieve the IP adress of my remote node, and as a pre-task of my ansible playbook I would like to run this script and set the IP adress. Is there a command in Ansible which would allow me to do this ?

yes you can

- name: Run local script
  hosts: localhost
  connection: local
  gather_facts: false
  tasks:
    - name: Execute script
      command: /path/to/your/script.py
      register: script_output

    - name: Print script output
      debug:
        var: script_output.stdout

or as proxx mentioned, u can use delegate_to

- name: Run local script on remote host
  hosts: your_remote_node
  gather_facts: false
  tasks:
    - name: Execute script on control machine
      command: /path/to/your/script.py
      register: script_output
      delegate_to: localhost

    - name: Print script output
      debug:
        var: script_output.stdout

With delegate_to it is possible to control where an action is run.

Straight from the Ansible documentation:

---
- hosts: webservers
  serial: 5

  tasks:
    - name: Take out of load balancer pool
      ansible.builtin.command: /usr/bin/take_out_of_pool {{ inventory_hostname }}
      delegate_to: 127.0.0.1

This will run the command on the ansible host. There is really not much more to it!

Link to Ansible documentation on the topic.