pygame_start.py

import pygame
import sys #will use the exit function

#Loads all the main pygame modules and initializes them
pygame.init()

screen_width=640
screen_height=480

guyImg = pygame.image.load('guy.png')
guyBigImgRight = pygame.transform.scale(guyImg, (200,200))
guyBigImgLeft = pygame.transform.flip(guyBigImgRight, True, False)

imageToDraw = guyBigImgRight

guyX = 100
guyY = 100
guySpeed = 5
guyVerticalSpeed = 0                 

circleSpeed = 100 #pixels per second

objectList = list()

myClock = pygame.time.Clock()

#Create a new Surface with the dimensions listed above
screen=pygame.display.set_mode((screen_width, screen_height))

#Loop forever:
while True:
    
    dt = myClock.tick(30)
    
    #The following makes the window close when clicking the "X" or exit button
    #Without this, the window will nouot close, and will need to be killed

    for event in pygame.event.get():
        if event.type == pygame.QUIT: sys.exit()
    
    screen.fill((0,0,0))
    
    screen.blit(imageToDraw, (guyX,guyY))
        
    keyPressedValues = pygame.key.get_pressed()
    if keyPressedValues[pygame.K_RIGHT]:
        guyX += guySpeed
        imageToDraw = guyBigImgRight
    if keyPressedValues[pygame.K_LEFT]:
        guyX -= guySpeed
        imageToDraw = guyBigImgLeft
    if keyPressedValues[pygame.K_UP]: guyVerticalSpeed = -20
    
    guyVerticalSpeed += 2
    guyY += guyVerticalSpeed
    
    if guyY > screen_height - 200:
        guyY = screen_height - 200
        guyVerticalSpeed = 0
    
    #Apply all the changes we've made to the screen surface
    #And draw them to the screen
    pygame.display.flip()