Pygame Problem

#!/usr/bin/python

# Expected environment:
# C:\Python26
# C:\Python26\include\pygame

import pygame
pygame.init()


class Button():

    color = "red"
    text_color = pygame.Color("black")
    font = pygame.font.Font(None,30)

    def __init__(self,background,topleft,rel_text,pres_text):
        self.background = background
        self.topleft = topleft
        self.rel_text = rel_text
        self.pres_text = pres_text
        self.__draw(rel_text)

    def pressed(self):
        """Changes color to represent button being pressed"""
        self.color = "blue"
        self.__draw("Pause")

    def released(self):
        """Changes back to the origonal color once relaesed"""
        self.color = "red"
        self.__draw("Bla")


    def __draw(self,text):
         self.shape = pygame.draw.rect(
             self.background,               # drawing surface
             pygame.Color(self.color),    # line colour
             self.topleft)

#        self.text = self.font.render(text,True,self.text_color)

#        self.background.blit(self.text,(80,100))

    def testClick(self,xy):
        """Tests to see if the button has been clicked
        - excpects x,y coordinates such as mouse position"""
        x,y = xy
        test = pygame.Rect(x,y,1,1)
        if self.shape.contains(test):
            return True
        else:
            return False




#=========:=========:=========:=========:=========:=========:=========:
def main():
    """
    capture events and display a message for each
    """
    screen = pygame.display.set_mode((640, 480))
    pygame.display.set_caption("GTunes")

    background = pygame.Surface(screen.get_size())
    background = background.convert()
    background.fill(pygame.color.Color("grey"))

    pause = Button(background,(50, 100, 80, 30),"Play","Pause")
    play = Button(background,(150, 100, 80, 30),"","")



    color = pygame.Color("black")

    font = pygame.font.Font(None,30)
    text = font.render("Bla",True,pygame.Color("black"))



    looping = True
    while looping:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                looping = False
            elif event.type == pygame.KEYDOWN:
                keyName = pygame.key.name(event.key)
                print "key pressed:", keyName
                if event.key == pygame.K_ESCAPE:
                    looping = False
            elif event.type == pygame.MOUSEBUTTONDOWN:
                print "mouse down:", pygame.mouse.get_pos()
                if play.testClick(pygame.mouse.get_pos()):
                    play.pressed()
                    text = font.render("New",True,pygame.Color("black"))
            elif event.type == pygame.MOUSEBUTTONUP:
                print "mouse up:", pygame.mouse.get_pos()
                play.released()



        screen.blit(background, (0, 0))
        screen.blit(text,(80,100))
        pygame.display.flip()

#=========:=========:=========:=========:=========:=========:=========:
if __name__ == "__main__":
    main()