Statix SC's Corrected Code

import pygame
###################################################################
pygame.init()
###################################################################
WHITE=(255,255,255)
RED=(255,0,0)
BLUE=(0,0,255)

screenWidth=600
screenHeight=800
BlockSize=50
FPS=30

screen=pygame.display.set_mode((screenHeight,screenWidth))
Clock=pygame.time.Clock()


class cBall(pygame.sprite.Sprite):
    def __init__ (self, color=RED, width=64, height=64):
        super(cBall,self).__init__()
        self.image=pygame.Surface((width,height))
        self.image.fill(color)
        self.rect=self.image.get_rect()
        self.hs=0
        self.vs=0


    def set_position(self,x,y):
        self.rect.x=x
        self.rect.y=y

    def set_image(self,filename=None):
        if (filename!=None):
            self.image=pygame.image.load(filename)
            self.rect=self.image.get_rect()

    def change_speed(self, hs, vs):
        self.hs += hs
        self.hs += vs

    def update(self):
        self.rect.x += self.hs
        self.rect.y += self.vs



##################################################################


# Note that I moved these three lines OUTSIDE of the While loop, and before them,
# so that object can be initialized and have its position set and it does not overwrite
# itself over and over again in the loop.
ball = cBall()

ball.set_image("brick2.png")

ball.set_position(0,0)

sp_group=pygame.sprite.Group()
sp_group.add(ball)

GameExit=False
while not GameExit:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            GameExit=True
            pygame.quit()
        if event.type==pygame.KEYDOWN:
            if event.key==pygame.K_RIGHT:
                print("keypressed")
                ball.change_speed(5,0)

    # Logic to correct the ball's position...
    ball.update()

    # All the drawing functions to refresh the screen...
    screen.fill(WHITE)
    sp_group.draw(screen)

    # Set the FPS and then actually refresh the screen for real.s
    Clock.tick(FPS)
    pygame.display.update()

##################################################################
pygame.quit()