Python3.x 如何在 20 秒后重复使用 Pillow 在现有图像上创建新图像

我正试着做一个小小的电梯推介节目来展示我自己.程序从2分钟开始倒计时，我希望它每20秒自动更新一张图片.这让我可以在20秒内详细介绍所显示的图片，然后继续.

然而，我被困在了图像切换部分.我已经研究了.After()、.time()、.sleep()，并研究了线程--这对我来说仍然是一个未知且粗糙的概念.

到目前为止，这就是我所在的地方.

目前，我的 idea 到处都是，我不确定哪种方法(最好)可行.我考虑过在倒计时函数中使用嵌套的if语句，但我认为这会使一切变得非常难以阅读.

我已经考虑过设置第二个函数来处理图像更改，您可以在下面看到一个早期的不起作用的示例.

from tkinter import *
from tkinter import ttk
from PIL import Image, ImageTk
import math
import time
import datetime


# ---------------------------- CONSTANTS ------------------------------- #
PINK = "#e2979c"
RED = "#e7305b"
GREEN = "#9bdeac"
YELLOW = "#f7f5dd"
BLUE = "#678ac2"
FONT_NAME = "Courier"
REPEATS = 0

# ---------------------------- TIMER MECHANISM ------------------------------- #


def countdown(total_seconds=60, total_minutes=2):
    if total_seconds == 60:
        total_seconds -= 1
        total_minutes -= 1
        timer_text.config(text=f"{total_minutes}:{total_seconds}")
        window.after(1000, countdown, total_seconds, total_minutes)
    elif total_seconds == 1 and total_minutes != 0:
        total_seconds += 59
        timer_text.config(text=f"{total_minutes}:00")
        window.after(1000, countdown, total_seconds, total_minutes)
    elif total_seconds == 0 and total_minutes > 0:
        total_seconds = 59
        total_minutes -= 1
        timer_text.config(text=f"{total_minutes}:{total_seconds}")
        window.after(1000, countdown, total_seconds, total_minutes)
    elif 11 > total_seconds > 0:
        total_seconds -= 1
        timer_text.config(text=f"{total_minutes}:0{total_seconds}")
        window.after(1000, countdown, total_seconds, total_minutes)
    elif total_seconds == 0 and total_minutes == 0:
        pass
    else:
        total_seconds -= 1
        timer_text.config(text=f"{total_minutes}:{total_seconds}")
        window.after(1000, countdown, total_seconds, total_minutes)


def image_change():
    global REPEATS
    REPEATS += 1
    if REPEATS == 1:
        second_img = (Image.open("edward.png"))
        second_resized_image = second_img.resize((850, 450), Image.LANCZOS)
        second_new_image = ImageTk.PhotoImage(second_resized_image)
        canvas.create_image(450, 225, anchor=CENTER, image=second_new_image)
    elif REPEATS == 2:
        print("repeats worked once")
    else:
        print("Error with repeats")


# ---------------------------- UI SETUP ------------------------------- #

# Create window & canvas


window = Tk()
window.title("Elevator Pitch")
window.geometry("900x600")
window.configure(bg=BLUE)

canvas = Canvas(window, width=900, height=500, bg=BLUE)
canvas.grid(column=1, row=1)

img = (Image.open("paco.png"))
resized_image = img.resize((850, 450), Image.LANCZOS)
new_image = ImageTk.PhotoImage(resized_image)
canvas.create_image(450, 225, anchor=CENTER, image=new_image)


# Create timer text & button


timer_text = Label(window, text="2:00", font=(FONT_NAME, 35, "bold"), bg=BLUE)
timer_text.grid(column=1, row=2)

start_button = Button(text="Start", command=countdown)
start_button.grid(column=1, row=3)

# Create new images


window.mainloop()