pygame error in my clicker game

[CrazyMakes]

# i am trying to follow pep 8 here

# importing stuff

import pygame
import time

# initializing pygame

pygame.init()

# defining variables

autog = 0
coins = 0
display_width = 800
display_height = 600
white = (255, 255, 255)
black = (0, 0, 0)
grey = (128, 128, 128)
light_grey = (224, 224, 224)

# creating display and caption

gameDisplay = pygame.display.set_mode((display_width, display_height))
pygame.display.set_caption("clicky clicks")

# defining functions


def DrawText(text, Textcolor, Rectcolor, x, y, fsize):
    font = pygame.font.Font('freesansbold.ttf', fsize)
    text = font.render(text, True, Textcolor, Rectcolor)
    textRect = text.get_rect()
    textRect.center = (x, y)
    gameDisplay.blit(text, textRect)


def rectangle(display, color, x, y, w, h):
    pygame.draw.rect(display, color, (x, y, w, h))


def main_loop():
    global autog
    tc = 0
    mong = 1
    cost = 50
    cost2 = 50
    global coins
    game_running = True
    while game_running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_running = False

            if event.type == pygame.MOUSEBUTTONDOWN:
                tc += 1
                print(tc)
                mopos = pygame.mouse.get_pos()
                if mopos >= (350, 0):
                    if mopos <= (450, 0):
                        print("button clicked 1")
                        coins += mong

                if mopos <= (800, 0):
                    if mopos >= (600, 0):
                        print("button clicked 2")
                        if coins >= cost:
                            coins = coins - cost
                            cost = cost * 2
                            mong += 3

                if mopos >= (50, 0):
                    if mopos <= (245, 0):
                        print("button clicked 3")
                        if coins >= cost2:
                            coins = coins - cost2
                            cost2 = cost2 * 2
                            autog += 1
                            while True:
                                time.sleep(0.5)
                                coins = coins + autog

        # drawing stuff

        gameDisplay.fill(white)
        DrawText("Clicky Clicks", black, white, 400, 100, 50)
        DrawText("you have " + str(coins) + " coins", black, white, 100, 50, 20)
        DrawText("upgrade 50*2", black, light_grey, 700, 300, 20)
        DrawText("buy auto miner 50*2", black, light_grey, 150, 370, 20)
        rectangle(gameDisplay, light_grey, 50, 400, 200, 300)
        rectangle(gameDisplay, black, 350, 250, 100, 100)
        rectangle(gameDisplay, light_grey, 600, 317, 200, 300)
        pygame.display.update()

# ending the program


main_loop()
pygame.quit()
quit()

So I have 2 problems 1 is that when I made my buttons they had a problem that when I clicked above or below the buttons they still activated. my second problem was with this code while True:
time.sleep(0.5)
coins = coins + autog this code is in button 3 and it crashes the program when I click the button

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I just realized i posted this in the wrong thread is there a way to change which thread this is on