Python：当使用threading.Timer时，如何在标签（Tkinter）中重写输出？

我正在编写一个程序，使用python GUI Tkinter显示当前的日期、时间和天气。天气详情是使用另一个网站的API检索的。当我运行程序时，我希望时间在变化（秒移动等）。我已经研究了线程和计时器，并得出了下面的输出。但是，我希望每秒钟都有时间来重写自己，而不是每秒钟都创建一个新标签。谁能告诉我怎么做

from tkinter import *
import requests
import time 
import threading

url='http://api.openweathermap.org/data/2.5/weather?q=Athlone,ie&appid=ca8b6f0388c49b7d926706a9c498310d'
data=requests.get(url)
read=data.json()
Cname = ("City Name: {}".format(read['name']))
TempDeg =("Tempterature: {}".format(read['main']['temp'] - 273.15))
WeaDesc =("Description: {}".format(read['weather'][0]['description']))

frame = Tk() #Constructor to make the frame in the background to put widgets on
frame.configure(background='black')
#frame.attributes('-fullscreen', True) #Takes up whole screen, no title bar
frame.state('zoomed') #Takes up whole screen with title bar on top. (Easier to exit when testing)

currentdate = time.strftime("%d/%m/%Y")

lbl1 = Label(frame, text=Cname, font=('Times New Roman', 30), fg='white', bg = 'black') 
lbl2 = Label (frame, text=TempDeg + '°C', font=('Times New Roman', 30), fg='white', bg = 'black')
lbl3 = Label (frame, text=WeaDesc, font=('Times New Roman',30), fg='white', bg = 'black')
#lbl4 = Label (frame, text=localtime, font=('Times New Roman',30), fg='white', bg = 'black')
lbl5 = Label (frame, text=currentdate, font=('Times New Roman',30), fg='white', bg = 'black')
lbl6 = Label (frame, text='*Insert complimentary comment here*', font=('Lucida Handwriting', 25), fg = 'white', bg = 'black')

def f():
    localtime = time.strftime("%H:%M:%S")
    lbl4 = Label (frame, text=localtime, font=('Times New Roman',30), fg='white', bg = 'black')
    lbl4.pack()
    threading.Timer(1, f).start()

f()
#lbl4.pack()
lbl5.pack()
lbl1.pack()
lbl2.pack()
lbl3.pack()
lbl6.pack()

frame.mainloop() #inifinte loop that allows the window to stay open

---

忽略随机的#注释，它们是由我插入的，以帮助我理解一些代码，因为我是新手。

要更改标签文本，您只需执行以下操作：

lbl4.config（text=localtime）

在f（）函数中

您还必须通过取消对lbl4原始定义的注释来定义标签一次。删除f（）中的pack（）调用。

您可以使用

frame.after(1000, f) 

而不是od

threading.Timer（1，f）.start（）

您必须在函数外部创建

lbl4

，然后在函数更改文本中使用

lbl4['text'] = localtime
#or 
lbl4.config(text=localtime)

工作示例

import tkinter as tk
import requests
import time 

# --- functions ---

def f():
    localtime = time.strftime("%H:%M:%S")
    lbl4['text'] = localtime
    # run again after 1000ms (1s)
    frame.after(1000, f)

# --- main ---

url = 'http://api.openweathermap.org/data/2.5/weather?q=Athlone,ie&appid=ca8b6f0388c49b7d926706a9c498310d'
data = requests.get(url)
read = data.json()
Cname = "City Name: {}".format(read['name'])
TempDeg = "Tempterature: {}".format(read['main']['temp'] - 273.15)
WeaDesc = "Description: {}".format(read['weather'][0]['description'])

frame = tk.Tk()
frame.configure(background='black')
#frame.attributes('-fullscreen', True) #Takes up whole screen, no title bar
#frame.state('zoomed') #Takes up whole screen with title bar on top. (Easier to exit when testing)

currentdate = time.strftime("%d/%m/%Y")

font = ('Times New Roman', 30)

lbl1 = tk.Label(frame, text=Cname, font=font, fg='white', bg='black') 
lbl2 = tk.Label(frame, text=TempDeg+'°C', font=font, fg='white', bg='black')
lbl3 = tk.Label(frame, text=WeaDesc, font=font, fg='white', bg='black')

# empty label
lbl4 = tk.Label(frame, font=font, fg='white', bg='black')

lbl5 = tk.Label(frame, text=currentdate, font=font, fg='white', bg='black')
lbl6 = tk.Label(frame, text='*Insert complimentary comment here*', font=('Lucida Handwriting', 25), fg='white', bg='black')

lbl4.pack()
lbl5.pack()
lbl1.pack()
lbl2.pack()
lbl3.pack()
lbl6.pack()

# run first time
f()

frame.mainloop()

---

如果您所做的只是更新时钟，那么您肯定不需要线程。例如：使用

root.after（毫秒，回调）

而不是thread@BryanOakley我只是以时钟为例。我需要更新当前GUI上的所有详细信息，因为我计划让程序连续运行数小时/数天？您仍然不需要线程，除非获取数据以更新显示需要几百毫秒以上的时间。@BryanOakley好的，谢谢您的反馈。还有一个问题，我是否需要像你在评论中附加的链接中那样使用“自我”论点？你的回答让我有点困惑。。这就是f（）现在的样子吗？def（）：lbl4.config（text=localtime）threading.Timer（1，f）.start（）