Python code that takes three sets of coordinates, representing three vertices of a rectangle, and calculates the fourth vertex

alis_rectangle_party.py

def find_alis_fourth_rectangle_vertex(coord1, coord2, coord3):
    x_coords = [coord1[0], coord2[0], coord3[0]]
    y_coords = [coord1[1], coord2[1], coord3[1]]

    fourth_x = None
    fourth_y = None

    for x in x_coords:
        if x_coords.count(x) == 1:
            fourth_x = x
            break

    for y in y_coords:
        if y_coords.count(y) == 1:
            fourth_y = y
            break

    return fourth_x, fourth_y


print("Enter the coordinates of three vertices of the rectangle:")

coords1 = list(map(float, input().split()))
coords2 = list(map(float, input().split()))
coords3 = list(map(float, input().split()))
coord1 = (coords1[0], coords1[1])
coord2 = (coords2[0], coords2[1])
coord3 = (coords3[0], coords3[1])

fourth_vertex = find_alis_fourth_rectangle_vertex(coord1, coord2, coord3)

print(fourth_vertex)