Random direction of the ball for Pong-like game - pygame

Question

I want to make a Pong-like game, but I don't know how to make the ball go in a random angle and bounce off the walls. What I have so far is this. This just has an enemy player that follows the y axis of the ball and it will bounce off the player and enemy.
import pygame,time,pygame.mixer
from pygame.locals import *
from random import randint
pygame.init()
#set screen to be the window
screen=pygame.display.set_mode((640,480))
#fills screen with white
screen.fill((255,255,255))
#set starting gravity
gravity=0.5
#limits fps
FPS=60
fpstime=pygame.time.Clock()
timer=0
#sets colour codes
red=(255,0,0)
green=(0,255,0)
blue=(0,0,255)
white=(255,255,255)
#set player starting location
playerpos1=10
playerpos2=240
direction=20
#ball starting location
ballpos1=320
ballpos2=240
ballspeed=3
#enemypos
enemypos=ballpos2
#makes the game loop start
FLYING=True
#game loop
while FLYING:
mx,my = pygame.mouse.get_pos()
screen.fill((255,255,255))
#draws the player and ball
pygame.draw.rect(screen,blue,(playerpos1,my,10,50))
pygame.draw.rect(screen,red,(ballpos1,ballpos2,20,20))
pygame.draw.rect(screen,green,(630,ballpos2,10,50))
#ball speed and random direction
ballpos1-=ballspeed
balldirection=randint(60,90)
#draws collision boxes
rightside=pygame.Rect(630,0,10,480)
leftside=pygame.Rect(10,0,10,480)
top=pygame.Rect(0,0,640,10)
ball=pygame.Rect(ballpos1,ballpos2,20,20)
enemy=pygame.Rect((630,ballpos2,10,50))
player=pygame.Rect(playerpos1,my,20,20)
#checks for collisions
if ball.colliderect(player):
ballspeed=-3
if ball.colliderect(enemy):
ballspeed=3
#checks if you exit
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
break
if event.type == KEYDOWN:
if event.key == K_w:
playerpos2-=2
pygame.display.update()
fpstime.tick(FPS)

Answer 1

since pong doesn't require major angle bouncing it can be done easy with a possible eight directions.
side = 'left'
vert = 'up'
if ballX == 'insert collision points with paddles':
if side == 'left':
side = 'right'
else:
side = 'left'
if vert == 'up':
vert = 'down'
else:
vert = 'up'
if vert == 'up':
ballY -=10
else:
ballY +=10
if side == 'left':
ballX-=10
else:
ballx+=10
this will have the ball moving diagonally always, which i found worked fine for pong. If you want picture perfect bouncing i refer you to this tutorial
(http://www.petercollingridge.co.uk/pygame-physics-simulation)