def dist_2(x0, y0, x1, y1):
    r"""Return the squared distance between two points.

    This is faster than calculating distance but should
    only be used with comparable ratios.

    Parameters
    ----------
    x0: float
        Starting x coordinate
    y0: float
        Starting y coordinate
    x1: float
        Ending x coordinate
    y1: float
        Ending y coordinate

    Returns
    -------
    d2: float
        squared distance

    See Also
    --------
    distance

    """
    d0 = x1 - x0
    d1 = y1 - y0
    return d0 * d0 + d1 * d1
r"""Return the squared distance between two points.

    This is faster than calculating distance but should
    only be used with comparable ratios.

    Parameters
    ----------
    x0: float
        Starting x coordinate
    y0: float
        Starting y coordinate
    x1: float
        Ending x coordinate
    y1: float
        Ending y coordinate

    Returns
    -------
    d2: float
        squared distance

    See Also
    --------
    distance