Python Game Programming Tutorial: Pong Part 3 Moving the Paddles

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#Python #Tutorial #Beginner

[Sondre]

Great tutorial!
If you want to restrict your paddles so they don't go off the screen, add this to your main game loop:
if paddle_a.ycor() >= 250:
paddle_a.sety(250)

if paddle_a.ycor() <= -250:
paddle_a.sety(-250)

if paddle_b.ycor() >= 250:
paddle_b.sety(250)

if paddle_b.ycor() <= -250:
paddle_b.sety(-250)

[GizaVAL]

This video is amazing, explained everything perfectly.

[Lodus_beatbox]

Appreciate being thorough, I'm a 15 year old kid, so a lot of the things that are probably common sense, aren't for me. So giving a lot of details really helped. thanks!

[axion]

Awesome! Loved it! What's the next best thing to do after this? Especially to get some income, even if it's a low key thing/project

[jake.]

I've ran into a small bug when running this code. I've noticed that when paddle A holds down W or S, the paddle will move. However, this is interrupted when paddle B is given a command (Up or Down). This causes paddle A to stop moving. Is there a way around this?

[AlbertoQuadriProject]

Hi Christian, I have a problem.
when pressing "w" nothing moves.

I'm using Python 3, here is the code:


import turtle

wn = turtle.Screen()
wn.title("Pong by QuadriProject")
wn.bgcolor("black")
wn.setup(width=800, height=600)
wn.tracer(0)

#paletta A

paddle_a = turtle.Turtle()
paddle_a.speed(0)
paddle_a.shape("square")
paddle_a.color("white")
paddle_a.shapesize(stretch_wid=5, stretch_len=1)
paddle_a.penup()
paddle_a.goto(-350, 0)


#paletta B

paddle_b = turtle.Turtle()
paddle_b.speed(0)
paddle_b.shape("square")
paddle_b.color("white")
paddle_b.shapesize(stretch_wid=5, stretch_len=1)
paddle_b.penup()
paddle_b.goto(350, 0)



#palla

ball = turtle.Turtle()
ball.speed(0)
ball.shape("square")
ball.color("white")
ball.penup()
ball.goto(0, 0)


#Funzione Move

def paddle_a_up():
y = paddle_a.ycor()
y += 20
paddle_a.sety(y)

#Keyboard chiamata

wn.listen()
wn.onkeypress(paddle_a_up(), "w")




#main game loop

while True:
wn.update()

[crazyaznub]

Is there a way to make the paddle_a move while holding either "w" or "s"? Right now, I have to keep clicking to move paddle_a where with paddle_b ("Up" and "Down" arrows) I can just hold and paddle_b moves continuously. I solved this problem by switching the arrow keys to another letter bound but I would like to know if its possible to get the letter keys to move the paddles on hold?

[JD-ojhr]

What interpreter do you use? Has such a clean look and I love the auto-completion

[zerosquadml]

How can I make the two paddles move at the same time?(I'm on windows) thanks very much. Here's my incomplete code:


import turtle

wn = turtle.Screen()#The window
wn.title("Pong by @Salai Hung")#The title of the window
wn.bgcolor("black")#The color of the window
wn.setup(width=800, height=600)#The setup of the window
wn.tracer(0)

# Paddle A
paddle_a = turtle.Turtle()
paddle_a.speed(0)#The speed of the projectile or item
paddle_a.shape("square")#The shape or silohoutte of the projectile
paddle_a.color("white")#The color of the projectile or shape
paddle_a.shapesize(stretch_wid=5, stretch_len=1)#Where it can go
paddle_a.penup()
paddle_a.goto(-350, 0)#Lets coders skip a variety of information

# Paddle B
paddle_b = turtle.Turtle()
paddle_b.speed(0)#The speed of the projectile or item
paddle_b.shape("square")#The shape or silohoutte of an/the object
paddle_b.color("white")#The color of the, shape or item
paddle_b.shapesize(stretch_wid=5, stretch_len=1)#Where it can go
paddle_b.penup()
paddle_b.goto(350, 0)#Lets coders skip a variety of information

# Ball
ball = turtle.Turtle()
ball.speed(0)#The speed of the projectile or item
ball.shape("square")#The shape or silohoutte of the projectile
ball.color("white")#The color of the projectile or shape
ball.penup()
ball.goto(0, 0)#Lets coders skip a variety of information

# Function
def paddle_a_up():
y = paddle_a.ycor()
y += 20
paddle_a.sety(y)

def paddle_a_down():
y = paddle_a.ycor()
y -= 20
paddle_a.sety(y)

def paddle_b_up():
y = paddle_b.ycor()
y += 20
paddle_b.sety(y)

def paddle_b_down():
y = paddle_b.ycor()
y -= 20
paddle_b.sety(y)

# Keyboard binding
wn.listen()#Listen to a certain line a code
wn.onkeypress(paddle_a_up, "w")#To make a keyboard input
wn.onkeypress(paddle_a_down, "s")#To make a keyboard input
wn.onkeypress(paddle_b_up, "Up")#To make a keyboard input
wn.onkeypress(paddle_b_down, "Down")#To make a keyboard input

# Main game loop
while True:# A true or false statement in which different events can happen in either false or true
wn.update()#Gives updates if a event that was programmed to happen

[checklist]

I need some help... both paddles can move up and down with no problem, but they can not move at the same time. Paddle A would need to stop moving so that paddle b can start moving. How would I be able to make both of them move at the same time?

[dominionbalogun]

during the keyboard bindings, what do you type if you want to us arrows

[joe-rkmx]

so much help thx a lot ceap up the good vids

[liqinxie]

it says
"Traceback (most recent call last):
File "C:/Users/USER/PycharmProjects/pong1/pong.py", line 66, in <module>
wn.onkeypress(paddle_b_down, "Down")
NameError: name 'paddle_b_down' is not defined
"

[dannynguyen]

So i tried to import turtle. It loads upad and everything but my paddles wont display. I tried copying you exact code into my IDLE/atom and launched it but the paddles still dont appear

[AyoBambino]

Hi, i had some issues when making the paddles move up and down. The paddles are growing longer rather than moving, I hope you can help me :)

[cweasegaming]

I'm using classes for this, and so far so good up until this error :
AttributeError: 'Paddles' object has no attribute 'ycor'


It will spit out this error whenever I press w to make it go up. Any ideas?

[kakalak]

It doesn't work in using raspberry pi and the program won't work i press w and nothing happens

[trollface]

i have an error: it said: ('_Screen' object has no attribute 'onkeypress')
can you fix this, i'm using python 3.7, windows 10 pro

[ibrahimabdalla]

This is the first tutorial that explained to me what the frick ycor and xcor mean.

[yuen]

Why pressing "s", the paddle_a can move continuously but pressing "w" doesn't?