How to Spawn additional Rectangles in Pygame?

Hey Guys!
i started learning python a month ago (2 to 3 times a week) now Im creating a simple game and i Really need your help!

So, the game goes like this_
"New (additional) Red squares" will be added(spawned and remain) on screen each time the "White square" eats a "Green square"

as simple as that :)

Please keep in mind: that my code is sloppy and not efficient and i should probably use classes. :)

Here is the code:

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


pygame.init()
gameDisplay = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Square-it")
clock = pygame.time.Clock()

xxx = randint(10, 780)
yyy = randint(10, 580)
block_width = 15
block_height = 15
block_color = pygame.Color("green")
block = pygame.Rect(xxx, yyy, block_width, block_height)

xx = randint(20, 780)
yy = randint(20, 580)
obstacle_width = 10
obstacle_height = 10
obstacle_color = pygame.Color("red")
obstacle = pygame.Rect(xx, yy, obstacle_width, obstacle_height)

a = 400
b = 300
hero_WIDTH = 10
hero_HEIGHT = 10
heroColor = pygame.Color("white")
hero = pygame.Rect(a, b, hero_WIDTH, hero_HEIGHT)

'''Heath Bar'''
def x():
    x = a - (health_WIDTH/2) + (hero_WIDTH/2)
    return x

def y():
    y = b - (health_HEIGHT/2) - (hero_HEIGHT/3)
    return y

health_HEIGHT = 3
health_WIDTH = 32
healthColor = pygame.Color("green")
health = pygame.Rect(x(), y(), health_WIDTH, health_HEIGHT)

score =0

while True:

    clock.tick(60)
    '''When removing (line below), the square creates a line behind it!!!'''
    gameDisplay.fill((0, 20, 5))
    gameDisplay.fill(heroColor, hero)
    gameDisplay.fill(block_color, block )
    gameDisplay.fill(healthColor, health)
    gameDisplay.fill(obstacle_color, obstacle)

    '''Score Text'''
    white = (255, 255, 255)
    message = "score: " + str(int(score))
    font = pygame.font.Font(None, 40)
    text = font.render(message, 1, white)
    gameDisplay.blit(text, (10, 10))

    pygame.display.update()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
           sys.exit()

    if hero.colliderect(block):
        block = pygame.Rect(randint(10, 780), randint(10, 580), block_width, block_height)
        score += int(block_width) * int(block_height) / 10

    elif hero.colliderect(obstacle):
        obstacle = pygame.Rect(randint(5, 790), randint(5, 590), obstacle_width, obstacle_height)
        score -= int(obstacle_width) * int(obstacle_height)/10
        hero.inflate_ip(1, 1)
        health.inflate_ip(1, 0)


    '''Hero'''
    keys = pygame.key.get_pressed()
    if keys[K_LEFT]:
        hero.left = hero.left - 10

    if keys[K_RIGHT]:
        hero.right = hero.right + 10

    if keys[K_UP]:
        hero.top = hero.top - 10

    if keys[K_DOWN]:
        hero.bottom = hero.bottom + 10

    if keys[K_SPACE]:
        hero.space = hero.space

    '''Health'''
    keys = pygame.key.get_pressed()
    if keys[K_LEFT]:
        health.left = health.left - 10

    if keys[K_RIGHT]:
        health.right = health.right + 10

    if keys[K_UP]:
        health.top = health.top - 10

    if keys[K_DOWN]:
        health.bottom = health.bottom + 10

    if keys[K_SPACE]:
        health.space = health.space