The yml:

    - name:  RUN PYTHON ON TARGET
      changed_when: false
      shell: python3 /.../try_python.py {{side_a}}
      become: true
      become_user: xxxx
      register: py_output

The script (adapted to AAP and tested locally):

# name = input()
with open("/.../try_txt.txt", "w") as file:
    file.write(f"{{$1}}")

The survey contains only the "side_a" variable, and it is working already for bash cases.