How can I make my bars flash colors in stead of a constant color

Question

im making a visualizer using pygame and im just messing around with it and now instead of having a constant color on the bars that pygame makes I would like it to either flash different colors or cycle different colors as its playing on screen here is the code im working with and im not sure on how to change the colors instead of the constant color which is a blue color at the moment

import sys, math, wave, numpy, pygame
from pygame.locals import *
from scipy.fftpack import dct

Number = 30 # number of bars
HEIGHT = 600 # HEIGHT of a bar
WIDTH = 40 #WIDTH of a bar
FPS = 15

file_name = sys.argv[0]
status = 'stopped'
fpsclock = pygame.time.Clock()

#screen init, music playback

pygame.init()
pygame.mixer.init()
screen = pygame.display.set_mode([Number * WIDTH, 50 + HEIGHT])
pygame.display.set_caption('Audio Visualizer')
my_font = pygame.font.SysFont('consolas', 16)
pygame.mixer.music.load("Sharp-Edges-half.cool.wav")
pygame.mixer.music.play()
pygame.mixer.music.set_endevent()
pygame.mixer.music.set_volume(0.2)
status = "Playing"

#process wave data

f = wave.open("Sharp-Edges-half.cool.wav", 'rb')
params = f.getparams()
nchannels, sampwidth, framerate, nframes = params[:4]
str_data = f.readframes(nframes)
f.close()
wave_data = numpy.fromstring(str_data, dtype = numpy.short)
wave_data.shape = -1, 2
wave_data = wave_data.T

num = nframes

def Visualizer(nums):
    num = int(nums)
    h = abs(dct(wave_data[0][nframes - num:nframes - num + Number]))
    h = [min(HEIGHT, int(i**(1 / 2.5) * HEIGHT / 100)) for i in h]
    draw_bars(h)

def vis(status):
    global num
    if status == "stopped":
        num = nframes
        return
    elif status == "paused":
        Visualizer(num)
    else:
        num -= framerate / FPS
        if num > 0:
            Visualizer(num)

def get_time():
    seconds = max(0, pygame.mixer.music.get_pos() / 1000)
    m, s = divmod(seconds, 60)
    h, m = divmod(m, 60)
    hms = ("%02d:%02d:%02d" % (h, m, s))
    return hms

def controller(key):
    global status
    if status == "stopped":
        if key == K_RETURN:
            pygame.mixer_music.play()
            status = "playing"
    elif status == "paused":
        if key == K_RETURN:
            pygame.mixer_music.stop()
            status = "stopped"
        elif key == K_SPACE:
            pygame.mixer.music.unpause()
            status = "playing"
    elif status == "playing":
        if key == K_RETURN:
            pygame.mixer.music.stop()
            status = "stopped"
        elif key == K_SPACE:
            pygame.mixer.music.pause()
            status = "paused"

def draw_bars(h):
    bars = []
    for i in h:
        bars.append([len(bars) * WIDTH , 50 + HEIGHT - i, WIDTH - 1, i])
    for i in bars:
        pygame.draw.rect(screen, [5,34,250], i, 0)

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == KEYDOWN:
            controller(event.key)

    if num <= 0:
        status = "stopped"

    name = my_font.render(file_name, True, (255,255,255))
    info = my_font.render(status.upper() + "" + get_time(), True, (255,255,255))
    screen.fill((0,0,0))
    screen.blit(name,(0,0))
    screen.blit(info,(0, 18))
    fpsclock.tick(FPS)
    vis(status)
    pygame.display.update()