def euclidean_distance(x1, y1, x2, y2):
    """
    Given two points (x1, y1) and (x2, y2), calculate and return the euclidean
    distance between the points.
    """
    return None  # your code here
    
if __name__ == "__main__":
    # these lines are to help you test your code to make sure it is working -
    # feel free to add your own tests!
    print("euclidean distance between (0, 4) and (6, 2) is 6.32")
    print(euclidean_distance(0, 4, 6, 2))
    print("euclidean distance between (-3, 1) and (-3, -5) is 6.0")
    print(euclidean_distance(-3, 1, -3, -5))