DRY Principle Visualizer

The Copy-Paste Nightmare

                # Site A

                d1 = ((x2-x1)*2 + (y2-y1)*2)**0.5

                # Site B

                d2 = ((x2-x1)*2 + (y2-y1)*2)**0.5

                # Site C

                d3 = ((x2-x1)*2 + (y2-y1)*2)**0.5

The Function Approach

                def calc_dist(x1, y1, x2, y2):

                    return ((x2-x1)*2 + (y2-y1)*2)**0.5

d1 = calc_dist(site_A)

d2 = calc_dist(site_B)

d3 = calc_dist(site_C)

Both scripts calculate the distance for 3 different sites. The left uses copy-paste, the right uses a reusable function.