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Beginning Game Programming for Teens with Python

This is a post by Tutorial Team Member Julian Meyer, a 13-year-old python developer. You can find him on Google+ and Twitter. Have you ever wondered how video games are created? It’s not as complicated as you might think! In this tutorial, you’ll create a simple game called Bunnies and Badgers, where the hero, the […]


This is a companion discussion topic for the original entry at https://www.raywenderlich.com/2795-beginning-game-programming-for-teens-with-python

Cool dude!!! Well impressed …
I would love to have a tution from you, but unfortunately I won’t be able to…
Anyways you are going well ahead… All the best for your upcoming future challenges little champ…
Best of luck!!!

Beginning Game Programming for Teens with Python- I downloaded the correct version of pygame however it is giving me an error message when I type import pygame can you help me??

Hi, I tried running the program up to the point where you add bad guys and arrow collisions. When I destroy a badger or the badger hits a castle, the game stalls.

When I go into the IDLE to chdeck the code I get this:
“Traceback (most recent call last):
File “C:/Users/Patutai/Documents/Python Tutorial/Python Training Learning Cloud/game resource/game2.py”, line 98, in
badguys.pop(index)
IndexError: pop index out of range”

Help please.

Hello, I’ve made the game using the code and it works and everything, I’m trying to work out a couple of things though.

I’m pretty new to programming and trying to use an old mac (I think a poor choice considering how bad the tech is), planning on getting a raspberry Pi soon but wanted to test theories as I have the laptop etc.

1st I’m trying to change how the game shoots, obviously at the moment it’s using mouse click, but I want to change it to use either the space bar or another key, my attempts so far have failed.

2nd I want to give the option to restart the game and rather than needing to exit and restart the programme, give the option to restart after the win/lose screen? Is that even possible?

Hi there, the program was going perfectly until it came to move. It is non-responsive to WASD for some reason! please help :slight_smile: . I have indented everything correctly and copied straight from the website, so no typos either. Thanks

Can you reply to me with the full scrip copied? Thanks

Here is the complete script updated for Python 3.4. E.g. I changed the / operator to //. Also it seems that the key constants from pygame changed.

# 1 - Import library
import math
import random
import pygame
from pygame.locals import *

# 2 - Initialize the game
pygame.init()
pygame.mixer.init()
width, height = 640, 480
screen = pygame.display.set_mode((width, height))
keys = [False, False, False, False]
playerpos = [100, 100]
acc = [0, 0]
arrows = []
badtimer = 100
badtimer1 = 0
badguys = [[640, 100]]
healthvalue = 194


# 3 - Load images
player = pygame.image.load("resources/images/dude.png")
grass = pygame.image.load("resources/images/grass.png")
castle = pygame.image.load("resources/images/castle.png")
arrow = pygame.image.load("resources/images/bullet.png")
badguyimg1 = pygame.image.load("resources/images/badguy.png")
badguyimg = badguyimg1
healthbar = pygame.image.load("resources/images/healthbar.png")
health = pygame.image.load("resources/images/health.png")
gameover = pygame.image.load("resources/images/gameover.png")
youwin = pygame.image.load("resources/images/youwin.png")

# 3.1 - Load audio
hit = pygame.mixer.Sound("resources/audio/explode.wav")
enemy = pygame.mixer.Sound("resources/audio/enemy.wav")
shoot = pygame.mixer.Sound("resources/audio/shoot.wav")
hit.set_volume(0.05)
enemy.set_volume(0.05)
shoot.set_volume(0.05)
pygame.mixer.music.load('resources/audio/moonlight.wav')
pygame.mixer.music.play(-1, 0.0)
pygame.mixer.music.set_volume(0.25)

# 4 - keep looping through
# 4 - keep looping through
running = 1
exitcode = 0
while running:
    # 5 - clear the screen before drawing it again
    screen.fill(0)
    # 6 - draw the screen elements
    for x in range(width//grass.get_width()+1):
        for y in range(height//grass.get_height()+1):
            screen.blit(grass, (x*100, y*100))
    screen.blit(castle, (0, 30))
    screen.blit(castle, (0, 135))
    screen.blit(castle, (0, 240))
    screen.blit(castle, (0, 345))
    # 6.1 - Set player position and rotation
    position = pygame.mouse.get_pos()
    angle = math.atan2(position[1]-(playerpos[1]+32),position[0]-(playerpos[0]+26))
    playerrot = pygame.transform.rotate(player, 360-angle*57.29)
    playerpos1 = (playerpos[0]-playerrot.get_rect().width/2, playerpos[1]-playerrot.get_rect().height/2)
    screen.blit(playerrot, playerpos1)
    # 6.2 - Draw arrows
    for bullet in arrows:
        index = 0
        velx = math.cos(bullet[0])*10
        vely = math.sin(bullet[0])*10
        bullet[1] += velx
        bullet[2] += vely
        if bullet[1]<-64 or bullet[1]>640 or bullet[2]<-64 or bullet[2]>480:
            arrows.pop(index)
        index += 1
        for projectile in arrows:
            arrow1 = pygame.transform.rotate(arrow, 360-projectile[0]*57.29)
            screen.blit(arrow1, (projectile[1], projectile[2]))
    # 6.3 - Draw badgers
    if badtimer == 0:
        badguys.append([640, random.randint(50, 430)])
        badtimer = 100 - (badtimer1 * 2)
        if badtimer1 >= 35:
            badtimer1 = 35
        else:
            badtimer1 += 5
    index = 0
    for badguy in badguys:
        if badguy[0] < -64:
            badguys.pop(index)
        badguy[0] -= 7
        # 6.3.1 - Attack castle
        badrect = pygame.Rect(badguyimg.get_rect())
        badrect.top = badguy[1]
        badrect.left = badguy[0]
        if badrect.left < 64:
            hit.play()
            healthvalue -= random.randint(5,20)
            badguys.pop(index)
        # 6.3.2 - Check for collisions
        index1 = 0
        for bullet in arrows:
            bullrect = pygame.Rect(arrow.get_rect())
            bullrect.left = bullet[1]
            bullrect.top = bullet[2]
            if badrect.colliderect(bullrect):
                enemy.play()
                acc[0] += 1
                badguys.pop(index)
                arrows.pop(index1)
            index1 += 1
        # 6.3.3 - Next bad guy
        index += 1
    for badguy in badguys:
        screen.blit(badguyimg, badguy)
    # 6.4 - Draw clock
    font = pygame.font.Font(None, 24)
    survivedtext = font.render(str((90000-pygame.time.get_ticks())//60000)+":"+str((90000-pygame.time.get_ticks())//1000%60).zfill(2), True, (0,0,0))
    textRect = survivedtext.get_rect()
    textRect.topright = [635, 5]
    screen.blit(survivedtext, textRect)
    # 6.5 - Draw health bar
    screen.blit(healthbar, (5, 5))
    for health1 in range(healthvalue):
        screen.blit(health, (health1 + 8, 8))
    # 7 - update the screen
    pygame.display.flip()
    # 8 - loop through the events
    for event in pygame.event.get():
        # check if the event is the X button
        if event.type == KEYDOWN:
            if event.key == K_w:
                keys[0] = True
            elif event.key == K_a:
                keys[1] = True
            elif event.key == K_s:
                keys[2] = True
            elif event.key == K_d:
                keys[3] = True
        if event.type == KEYUP:
            if event.key == K_w:
                keys[0] = False
            elif event.key == K_a:
                keys[1] = False
            elif event.key == K_s:
                keys[2] = False
            elif event.key == K_d:
                keys[3] = False
        if event.type == QUIT:
            # if it is quit the game
            pygame.quit()
            exit(0)
        if event.type == MOUSEBUTTONDOWN:
            shoot.play()
            position = pygame.mouse.get_pos()
            acc[1] += 1
            arrows.append([math.atan2(position[1]-(playerpos1[1]+32),position[0]-(playerpos1[0]+26)),playerpos1[0]+32,playerpos1[1]+32])
    # 9 - Move player
    if keys[0]:
        playerpos[1] -= 5
    elif keys[2]:
        playerpos[1] += 5
    if keys[1]:
        playerpos[0] -= 5
    elif keys[3]:
        playerpos[0] += 5
    badtimer -= 1
    # 10 - Win/Lose check
    if pygame.time.get_ticks() >= 90000:
        running = 0
        exitcode = 1
    if healthvalue <= 0:
        running = 0
        exitcode = 0
    if acc[1] != 0:
        accuracy = acc[0]*1.0/acc[1]*100
    else:
        accuracy = 0

# 11 - Win/lose display
if exitcode == 0:
    pygame.font.init()
    font = pygame.font.Font(None, 24)
    text = font.render("Accuracy: "+str(accuracy)+"%", True, (255, 0, 0))
    textRect = text.get_rect()
    textRect.centerx = screen.get_rect().centerx
    textRect.centery = screen.get_rect().centery+24
    screen.blit(gameover, (0, 0))
    screen.blit(text, textRect)
else:
    pygame.font.init()
    font = pygame.font.Font(None, 24)
    text = font.render("Accuracy: "+str(accuracy)+"%", True, (0, 255, 0))
    textRect = text.get_rect()
    textRect.centerx = screen.get_rect().centerx
    textRect.centery = screen.get_rect().centery+24
    screen.blit(youwin, (0, 0))
    screen.blit(text, textRect)

while 1:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            exit(0)
    pygame.display.flip()

If i want to change image of player then how could i do that???
Please give the steps for image changing also.

can you please help me I keep on getting this message when I try to import pygame

Traceback (most recent call last):
File “<pyshell#0>”, line 1, in
import pygame
File “C:\Users\zacha\AppData\Local\Programs\Python\Python36-32\pygame.py”, line 2, in
from pygame.locals import*
ModuleNotFoundError: No module named ‘pygame.locals’; ‘pygame’ is not a package

Python 3.6 'float err … ".
Edit below # 6 below …

For x in range (int (width / grass.get_width ()) + 1)
For y in range (int (height / grass.get_height ()) + 1):

Good Luck!!..

Why the game getting slower on higher resolution ?

Hi i got as far as checking if i downloaded pygame correctly and it turns out i didnt so i came her because it said to so can someone plz tell me how to properly install it. thx

It’s the greatest tutoial for teens that I have ever seen! I have translated this into Chinese.

Hey ,
I got error in importing pygame can you plz help me What I should do…?

Hey i downloaded the python code and once i put it in import pygame it comes up with this

import pygame

Traceback (most recent call last):
File “<pyshell#0>”, line 1, in
import pygame
File “/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pygame/init.py”, line 95, in
from pygame.base import *
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pygame/base.so, 2): no suitable image found. Did find:
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pygame/base.so: no matching architecture in universal wrapper

any help would be appreciated

This tutorial is more than six months old so questions are no longer supported at the moment for it. We will update it as soon as possible. Thank you! :]