if we want to effect diagonal movement of an object on game window, we need to use numeric key pad keys. while keys 4,6,8 and 2 correspond to left, right, up and down arrows, num keys 7, 9, 3 and 1 can be used to move the object in up-left, up-right, down-right and down-left diagonal movements. these keys are identified by pygame with following values −

k_kp1       keypad 1
k_kp2       keypad 2
k_kp3       keypad 3
k_kp4       keypad 4
k_kp5       keypad 5
k_kp6       keypad 6
k_kp7       keypad 7
k_kp8       keypad 8
k_kp9       keypad 9

example

for left, right, up and down arrow press, x and y coordinates are incremented/decremented as before. for diagonal movement, both coordinates are changed as per direction. for instance, for k_kp7 key-press, both x and y are decremented by 5, for k_kp9 x is incremented and y is decremented.

image_filename = 'pygame.png'
import pygame
from pygame.locals import *
from sys import exit
pygame.init()
screen = pygame.display.set_mode((400,300))
pygame.display.set_caption("moving with arrows")
img = pygame.image.load(image_filename)
x = 0
y= 150
while true:
   screen.fill((255,255,255))
   screen.blit(img, (x, y))
   for event in pygame.event.get():
      if event.type == quit:
         exit() 
      if event.type == keydown:
         if event.key == k_kp6:
            x= x+5
         if event.key == k_kp4:
            x=x-5
         if event.key == k_kp8:
            y=y-5
         if event.key == k_kp2:
            y=y+5
         if event.key == k_kp7:
            x=x-5
            y=y-5
         if event.key == k_kp9:
            x=x+5
            y=y-5
         if event.key == k_kp3:
            x=x+5
            y=y+5
         if event.key == k_kp1:
            x=x-5
            y=y+5
   pygame.display.update()

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