Six steps to complete in M4Lab2# Define a list to store 3 colors# Define statements for each mouse button# Within the program suite, draw on screen with a different color# When your program runs, a black box appears. # Draw with a different color using the left, middle, and right cursor buttons# The middle cursor is the scrollwheel. You can configure a random color.# Close the draw window. In the Python shell, type exit() to quit import pygameimport random # optional for this program, but useful for random colors, such as# randcolor = random.randrange (0, 255)pygame.init()# Defines the display size with a width and height of 300, 300size = width, height = 300, 300# Step 1: Define a colors list to describe 3 colors.# Hint, use their RGB number valuesscreen = pygame.display.set_mode(size)# Draws the screen using the sizepygame.display.set_caption("Click and drag to draw")# Displays the title at the top of the draw screenkeep_going# The program continues unti you close the window and type exit() in the shell= True# Step 2: define a radius variable for your pen at 5, 10 or 15# Test them to see which radius you prefer and use it.mousedown = False# we have not started drawing yetwhile keep_going != False:for event in pygame.event.get():if event.type == pygame.QUIT:keep_goingpygame.quit()if event.typeFalse== pygame. MOUSEBUTTONDOWN:lown Trueif event.type == pygame. MOUSEBUTTONUP:mousedown = Falsemou:if mousedown: # start drawingspot = pygame.mouse.get_pos() # locate the pen's position as the 1st spotif pygame. mouse.get_pressed () [0]: # Boolean for button 1button_color = colors[0] # selects the first color from the list# Step 3: write the elif for pressing button 2, similar to button 1# Step 4: write the statement for button 2's color# Step 5: write the else statement for button 3# Step 6: choose a color from the listpygame.draw.circle(screen, button_color, spot, radius)# The pen is in the shape of a circle that draws on the screen# using the button color, the position of the spot, and the pen's radiuspygame.display.update()# You can draw until you close the Pygame windowpygame.quit ( )# The program ends after you type exit() in the Python shell.# For fun, try defining a random color and calling it for button_color# randcolor = random.randrange (0,255)

Solution :: line 15: I have used (255,0,0),(255,255,0),(0,255,0) i.e (Red, yellow ,Green) Instead you can generate random colors and use them as shown here colors = [] colors.append(tuple(random.sample(range(0,256),3))) ## generates a tuple with 3 random values (R,G,B) Repeat above random generation three times for three different colors for three mouse buttons pygame.mouse.get_pressed()[0] ---- for left button click pygame.mouse.get_pressed()[1] ---- for Middle button click pygame.mouse.get_pressed()[2] ---- for Right button click from line 48 to 54 we check for the type of button clicked and change the color and then draw circle (line 58)Thank you .... Please feel free to ask the doubts if you have any doubts will solved it ....