<filename>20.py
def plus_one(x):
    """[summary]

    Args:
        x ([type]): [description]

    Returns:
        [type]: [description]
    """

    return x + 1

<filename>20.py
def plus_one(x):
    """[summary]

    Args:
        x ([type]): [description]

    Returns:
        [type]: [description]
    """

    return x + 1

[summary]      Args:         x ([type]): [description]      Returns:         [type]: [description]