Python Turtle Pong Game with AI Paddle

This article provides a step‑by‑step tutorial for creating a Pong game in Python using the turtle module, including an AI‑controlled paddle that always tracks the ball.

Step 1 imports turtle and random , creates the screen, sets its title, background color, and size. Step 2 creates the ball object, sets its shape, color, initial position, and movement vectors ( dx and dy ). Step 3 creates the AI paddle, positioning it on the left side and stretching it vertically. Step 4 creates the player paddle on the right side with the same dimensions. Step 5 defines move_ai_paddle() to move the AI paddle toward the ball’s y‑coordinate. Step 6 defines paddle2_up() and paddle2_down() to move the player paddle with the Up/Down keys and binds these functions to keypress events. Step 7 runs an infinite while True loop that updates the screen, moves the ball, checks for wall collisions, moves the AI paddle, detects scoring conditions, and handles collisions with both paddles, including a 90% chance of collision for the AI paddle.

The complete source code is provided below for direct copying.

<code># Step 1 import set up turtle and Screen
import turtle
import random
s = turtle.Screen()
s.title("Pong")
s.bgcolor("black")
s.setup(width=600, height=400)

# Step 2 Create ball
ball = turtle.Turtle()
ball.speed(0)
ball.shape("circle")
ball.color("white")
ball.penup()
ball.goto(0, 0)
ball.dx = 4
ball.dy = 4

# Step 3 Create AI paddle
ai = turtle.Turtle()
ai.speed(0)
ai.shape("square")
ai.color("white")
ai.penup()
ai.goto(-250, 0)
ai.shapesize(stretch_wid=5, stretch_len=1)

# Step 4 Create a paddle For You
you = turtle.Turtle()
you.speed(0)
you.shape("square")
you.color("white")
you.penup()
you.goto(250, 0)
you.shapesize(stretch_wid=5, stretch_len=1)

# Step 5 Create Function to move AI paddle
def move_ai_paddle():
    y = ball.ycor()
    if y > 0:
        ai.sety(ai.ycor() + 2)
    else:
        ai.sety(ai.ycor() - 2)

# Step 6 Create a Function to move the your paddle
def paddle2_up():
    y = you.ycor()
    y += 20
    you.sety(y)

def paddle2_down():
    y = you.ycor()
    y -= 20
    you.sety(y)
# Your Paddle control it with key
s.listen()
s.onkeypress(paddle2_up, "Up")
s.onkeypress(paddle2_down, "Down")

# Step 7 Start the game with a while loop
while True:
    s.update()
    # Move the ball
    ball.setx(ball.xcor() + ball.dx)
    ball.sety(ball.ycor() + ball.dy)
    # Check for collisions with the walls
    if ball.ycor() > 190 or ball.ycor() < -190:
        ball.dy *= -1
    # Move the robot paddle towards the ball
    if ball.ycor() > ai.ycor():
        ai.sety(ai.ycor() + 4)
    elif ball.ycor() < ai.ycor():
        ai.sety(ai.ycor() - 4)
    # Check for end game conditions
    if ball.xcor() > 300:
        turtle.textinput("Game End", "You Loss Pong Game With AI!")
        break
    if ball.xcor() < -300:
        turtle.textinput("Game End", "You Win Pong Game With AI!")
        break
    # Check for collisions with the robot paddle
    if (ball.xcor() < -240 and ball.xcor() > -250) and (ball.ycor() < ai.ycor() + 40 and ball.ycor() > ai.ycor() - 40):
        if random.random() < 0.9: # 90% chance of collision
            ball.dx *= -1
    # Check for collisions with the user paddle
    if (ball.xcor() > 240 and ball.xcor() < 250) and (ball.ycor() < you.ycor() + 40 and ball.ycor() > you.ycor() - 40):
        ball.dx *= -1

turtle.exitonclick()</code>