如何使用 Tkinter 创建自动更新的 GUI？

from Tkinter import *
import time
#Tkinter stuff

class App(object):
    def __init__(self):
        self.root = Tk()

        self.labeltitle = Label(root, text="",  fg="black", font="Helvetica 40 underline bold")
        self.labeltitle.pack()

        self.labelstep = Label(root, text="",  fg="black", font="Helvetica 30 bold")
        self.labelstep.pack()

        self.labeldesc = Label(root, text="",  fg="black", font="Helvetica 30 bold")
        self.labeldesc.pack()

        self.labeltime = Label(root, text="",  fg="black", font="Helvetica 70")
        self.labeltime.pack()

        self.labelweight = Label(root, text="",  fg="black", font="Helvetica 25")
        self.labelweight.pack()

        self.labelspeed = Label(root, text="",  fg="black", font="Helvetica 20")
        self.labelspeed.pack()

        self.labeltemp = Label(root, text="", fg="black", font="Helvetica 20")
        self.labeltemp.pack()

        self.button = Button(root, text='Close recipe', width=25, command=root.destroy)
        self.button.pack()

    def Update(self, label, change):
        label.config(text=str(change))

def main():
    app = App()
    app.mainloop()

if __name__ == "__main__":
    main()

我正在尝试创建一个食谱显示，它将在 Tkinter GUI 的屏幕上显示步骤、说明、重量和其他变量。

但是，我不知道如何更新 GUI 以随着配方的每个新步骤而变化，因为内容必须根据用户输入（从服务器获取）动态更新。如何根据步骤的变化实现GUI其他元素的更新？

您可以使用after()在（例如）1000 毫秒（1 秒）后运行函数来执行某些操作并更新标签上的文本。该函数可以在 1000 毫秒后再次（一次又一次）自行运行。

以当前时间为例

from Tkinter import *
import datetime

root = Tk()

lab = Label(root)
lab.pack()

def clock():
    time = datetime.datetime.now().strftime("Time: %H:%M:%S")
    lab.config(text=time)
    #lab['text'] = time
    root.after(1000, clock) # run itself again after 1000 ms
    
# run first time
clock()

root.mainloop()

顺便说一句：你可以使用StringVar as 桑达尔·纳塔拉吉·桑达尔 https://stackoverflow.com/users/1545322/sundar-nataraj-%d0%a1%d1%83%d0%bd%d0%b4%d0%b0%d1%80建议

编辑：(2022.01.01)

已更新至 Python 3，并包含以下建议的其他更改PEP 8——Python 代码风格指南 https://www.python.org/dev/peps/pep-0008/

import tkinter as tk   # PEP8: `import *` is not preferred
import datetime

# --- functions ---
# PEP8: all functions before main code
# PEP8: `lower_case_name` for funcitons
# PEP8: verb as function's name
                     
def update_clock():
    # get current time as text
    current_time = datetime.datetime.now().strftime("Time: %H:%M:%S")
    
    # udpate text in Label
    lab.config(text=current_time)
    #lab['text'] = current_time
    
    # run itself again after 1000 ms
    root.after(1000, update_clock) 

# --- main ---

root = tk.Tk()

lab = tk.Label(root)
lab.pack()
    
# run first time at once
update_clock()

# run furst time after 1000ms (1s)
#root.after(1000, update_clock)

root.mainloop()