Creating the ball to spawn randomly - oop

Question

I am fairly new to Object-Oriented Programming, but I have this Pong game, all I am looking to add to it is have the ball spawn randomly. Not asking for anyone to write my code for me, just looking for a little push in the right direction.
import pygame, sys, random
from pygame.locals import *
pygame.init()
mainClock = pygame.time.Clock()
WINDOWWIDTH = 620
WINDOWHEIGHT = 440
windowSurface = pygame.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT), 0, 32)
pygame.display.set_caption('Pong')
pygame.font.init()
FPS = 60
class Player(object):
def __init__(self, x, y, padWid, padHei):
self.x, self.y = 0, WINDOWHEIGHT/2
self.speed = 3
self.padWid, self.padHei = 8, 64
self.score = 0
self.scoreFont = pygame.font.Font("imagine_font.ttf", 64)
def scoring(self):
scoreBlit = self.scoreFont.render(str(self.score), 1, (255, 255, 255))
windowSurface.blit(scoreBlit, (32, 16))
if self.score == 10:
print ("player 1 wins!")
exit()
def movement(self):
keys = pygame.key.get_pressed()
if keys[pygame.K_w]:
self.y -= self.speed
elif keys[pygame.K_s]:
self.y += self.speed
if self.y <= 0:
self.y = 0
elif self.y >= WINDOWHEIGHT-64:
self.y = WINDOWHEIGHT-64
def draw(self):
pygame.draw.rect(windowSurface, (255, 255, 255), (self.x, self.y, self.padWid, self.padHei))
class Enemy(Player):
def __init__(self, x, y, padWid, padHei):
self.x, self.y = WINDOWWIDTH-8, WINDOWHEIGHT/2
self.speed = 3
self.padWid, self.padHei = 8, 64
self.score = 0
self.scoreFont = pygame.font.Font("imagine_font.ttf", 64)
def scoring(self):
scoreBlit = self.scoreFont.render(str(self.score), 1, (255, 255, 255))
windowSurface.blit(scoreBlit, (WINDOWHEIGHT+92, 16))
if self.score == 10:
print ("Player 2 wins!")
exit()
def movement(self):
keys = pygame.key.get_pressed()
if keys[pygame.K_UP]:
self.y -= self.speed
elif keys[pygame.K_DOWN]:
self.y += self.speed
if self.y <= 0:
self.y = 0
elif self.y >= WINDOWHEIGHT-64:
self.y = WINDOWHEIGHT-64
def draw(self):
pygame.draw.rect(windowSurface, (255, 255, 255), (self.x, self.y, self.padWid, self.padHei))
class Ball(object):
def __init__(self, x, y, size):
self.x, self.y = WINDOWWIDTH/2, WINDOWHEIGHT/2
self.speed_x = -3
self.speed_y = 3
self.size = 8
def movement(self):
self.x += self.speed_x
self.y += self.speed_y
#wall col
if self.y <= 0:
self.speed_y *= -1
elif self.y >= WINDOWHEIGHT-self.size:
self.speed_y *= -1
if self.x <= 0:
self.__init__(WINDOWWIDTH/2, WINDOWHEIGHT/2, 8)
enemy.score += 1
elif self.x >= WINDOWWIDTH-self.size:
self.__init__(WINDOWWIDTH/2, WINDOWHEIGHT/2, 8)
self.speed_x = 3
player.score += 1
for n in range(-self.size, player.padHei):
if self.y == player.y + n:
if self.x <= player.x + player.padWid:
self.speed_x *= -1
break
n += 1
for n in range(-self.size, enemy.padHei):
if self.y == enemy.y + n:
if self.x >= enemy.x - enemy.padWid:
self.speed_x *= -1
break
n += 1
def draw(self):
pygame.draw.rect(windowSurface, (255, 255, 255), (self.x, self.y, 8, 8))
def main():
global balls, BALLSIZE, windowSurface, player, ball, enemy, mainClock, FPS
player = Player('16', '2', '8', '64')
ball = Ball('2', '2', '8')
enemy = Enemy('-16', '2', '8' , '64')
while True:
#process
for event in pygame.event.get():
if event.type == pygame.QUIT:
print ("Game exited by user")
exit()
ball.movement()
player.movement()
enemy.movement()
windowSurface.fill((0, 0, 0))
ball.draw()
player.draw()
player.scoring()
enemy.draw()
enemy.scoring()
pygame.display.flip()
mainClock.tick(FPS)
main()

Answer 1

If you want the ball to spawn randomly, use pygame.draw.circle() to draw the ping pong ball.
To generate it randomly, import Math, and then for pygame.draw.circle() 3rd argument put
(Math.randint(1, Screen.width), Math.randint(1, Screen.height))
Here is docs:
http://www.pygame.org/docs/ref/draw.html#pygame.draw.circle