Mouse Click Color Changer

import pygame, random, sys
from pygame.locals import *

#Mouse click color changer.

#Initializing variables
#RGB    =     R     G      B
white   =   (255,   255,  255)
black   =   (0,     0,      0)
red     =   (255,   0,      0)
green   =   (0,     255,    0)
blue    =   (0,     0,    255)

bgcolor =   white

#List
otherColors = [black, red, green, blue]

#Window Size & Clock Rate
width   =   640
height  =   480
fps     =   30

#Initialize main
def main():
    pygame.init()
    pygame.mixer.init()

    fpsClock = pygame.time.Clock()
    displayScreen = pygame.display.set_mode((width, height))
    pygame.display.set_caption('Mouse Click Color Changer')

    colorBoard = getRandomizedColor(otherColors)

    #Game Loop
    while True:
        #Process Input (Events)
        mouseClicked = False

        for event in pygame.event.get():
            if event.type == QUIT or (event.type == KEYUP and event.key == K_ESCAPE):
                pygame.quit()
                sys.exit()

            elif event.type == MOUSEBUTTONUP:
                mouseClicked = True

        #Update
        if mouseClicked:
            #Change Color
            displayScreen.fill(otherColors)

        #Render (Draw)
        displayScreen.fill(bgcolor)

        #redraws screen (https://www.pygame.org/docs/tut/newbieguide.html)
        pygame.display.update()
        fpsClock.tick(fps)


def getRandomizedColor(changeColor):
    #get a list of every possible color
    backgroundColor = []
    for color in otherColors:
        backgroundColor.append(color)

    #Randomize the order of the list
    changeColor = random.shuffle(backgroundColor)
    return changeColor


if __name__ == '__main__':
    main()