How to use the oommfc.CGEvolver function in oommfc

def driver_script(driver, system, compute=None, **kwargs):
    mif = ''
    if isinstance(driver, oc.MinDriver):
        # Check evolver and set default if not passed.
        if not hasattr(driver, 'evolver'):
            driver.evolver = oc.CGEvolver()
        elif not isinstance(driver.evolver, oc.CGEvolver):
            msg = f'Cannot use {type(driver.evolver)} for evolver.'
            raise TypeError(msg)

        # Define default stopping_mxHxm if not passed. OOMMF cannot run without
        # this value.
        if not hasattr(driver, 'stopping_mxHxm'):
            driver.stopping_mxHxm = 0.1

        mif += oc.scripts.evolver_script(driver.evolver)

        # Minimisation driver script.
        mif += '# MinDriver\n'
        mif += 'Specify Oxs_MinDriver {\n'
        mif += '  evolver :evolver\n'
        mif += '  mesh :mesh\n'

def driver_script(driver, system, compute=None, **kwargs):
    mif = ''
    if isinstance(driver, oc.MinDriver):
        # Check evolver and set default if not passed.
        if not hasattr(driver, 'evolver'):
            driver.evolver = oc.CGEvolver()
        elif not isinstance(driver.evolver, oc.CGEvolver):
            msg = f'Cannot use {type(driver.evolver)} for evolver.'
            raise TypeError(msg)

        # Define default stopping_mxHxm if not passed. OOMMF cannot run without
        # this value.
        if not hasattr(driver, 'stopping_mxHxm'):
            driver.stopping_mxHxm = 0.1

        mif += oc.scripts.evolver_script(driver.evolver)

        # Minimisation driver script.
        mif += '# MinDriver\n'
        mif += 'Specify Oxs_MinDriver {\n'
        mif += '  evolver :evolver\n'
        mif += '  mesh :mesh\n'
        mif += '  Ms :m0_norm\n'

mif += eps_primemif

    # Scripts for a specific evolver.
    if isinstance(evolver, oc.EulerEvolver):
        mif += '# EulerEvolver\n'
        mif += 'Specify Oxs_EulerEvolve:evolver {\n'
    elif isinstance(evolver, oc.RungeKuttaEvolver):
        mif += '# RungeKuttaEvolver\n'
        mif += 'Specify Oxs_RungeKuttaEvolve:evolver {\n'
    elif isinstance(evolver, oc.SpinTEvolver):
        mif += '# Zhang-Li evolver\n'
        mif += 'Specify Anv_SpinTEvolve:evolver {\n'
    elif isinstance(evolver, oc.SpinXferEvolver):
        mif += '# Slonczewski evolver\n'
        mif += 'Specify Oxs_SpinXferEvolve:evolver {\n'
    elif isinstance(evolver, oc.CGEvolver):
        mif += '# CGEvolver\n'
        mif += 'Specify Oxs_CGEvolve:evolver {\n'

    # Define all other parameters.
    for attr, value in evolver:
        mif += f'  {attr} {value}\n'
    mif += '}\n\n'

    return mif