def distance(x0, y0, x1, y1):
    """ Returns the distance between two points.
    """
    return sqrt(pow(x1-x0, 2) + pow(y1-y0, 2))
def distance(x0, y0, x1, y1):
    """ Returns the distance between two points.
    """
    return sqrt(pow(x1-x0, 2) + pow(y1-y0, 2))
Returns the distance between two points.