Chapter 6 - Functions - Programming Exercises - Page 212: 6.47

This program uses the turtle module to display two chessboards on the screen. The drawChessboard function takes in the start and end coordinates of the chessboard and uses a nested loop to draw each square in the correct location and color. The program then calls the drawChessboard function twice to display two chessboards, once with the upper-left corner at (-200, 200) and the bottom-right corner at (200, -200), and once with the upper-left corner at (-400, 0) and the bottom-right corner at (-200, -200). (Please see the step by step algorithm below)

import turtle def drawChessboard(startx, endx, starty, endy): $\hspace{4mm}$# Define the square size (function starts here) $\hspace{4mm}$square_size = (endx - startx) / 8 $\hspace{4mm}$# Set the pen color to black $\hspace{4mm}$turtle.pencolor("black") $\hspace{4mm}$# increase speed of turtle $\hspace{4mm}$turtle.speed(0) $\hspace{4mm}$# Loop through each row $\hspace{4mm}$for row in range(8): $\hspace{8mm}$# Loop through each column $\hspace{8mm}$for col in range(8): $\hspace{12mm}$# Calculate the top-left corner of the square $\hspace{12mm}$x = startx + col * square_size $\hspace{12mm}$y = starty - row * square_size $\hspace{12mm}$# Draw the square $\hspace{12mm}$turtle.penup() $\hspace{12mm}$turtle.goto(x, y) $\hspace{12mm}$turtle.pendown() $\hspace{12mm}$turtle.begin_fill() $\hspace{12mm}$for i in range(4): $\hspace{16mm}$turtle.forward(square_size) $\hspace{16mm}$turtle.right(90) $\hspace{12mm}$turtle.end_fill() $\hspace{12mm}$# Change the fill color for the next square in the chessboard $\hspace{12mm}$if turtle.fillcolor() == "black": $\hspace{16mm}$turtle.fillcolor("white") $\hspace{12mm}$else: $\hspace{16mm}$turtle.fillcolor("black") $\hspace{8mm}$# Change the fill color for the next row in chessboard $\hspace{8mm}$if turtle.fillcolor() == "black": $\hspace{12mm}$turtle.fillcolor("white") $\hspace{8mm}$else: $\hspace{12mm}$turtle.fillcolor("black") # (function ends here) # Set the screen size turtle.screensize(800, 800) # Draw the first chessboard drawChessboard(-400, 0, 200, -200) # Draw the second chessboard drawChessboard(100, 500, 200, -200) # Hide the turtle and exit turtle.hideturtle() turtle.done()