Tkinter标签文本不更新/覆盖

Question

from Tkinter import *
self.btn_run = Button(window, text="Run Model", command=self.clicked_run)
self.btn_run.grid(column=2, row=6)
self.lbl_finish = Label(window, text="")
self.lbl_finish.grid(column=2, row=7)

# Submit button for run model
def clicked_run(self):        
self.lbl_finish.configure(text="")
if len(train_SKU) == 0 or len(test_SKU) == 0:
tkMessageBox.showinfo('ERROR', 'Train or Test is empty!')
else:
train_model() # trains the machine learning model
self.lbl_finish.configure(text="Finished!")

基本上，我有一个按钮"运行模型"，运行我的机器学习模型。完成后，我想在按钮下面有一条写着"完成！"的文字。当再次按下"Run Model"按钮时，我希望"Finished！"文本清除并仅在ML模型完成时显示。然而，现在，在第一个"完成！"出现后，即使再次按下"运行模型"按钮，它也不会消失。

Answer 1

您可以使用StringVariable并更新窗口

import tkinter as tk
from time import sleep
window = tk.Tk()
var = tk.StringVar()
var.set('')
lbl_finish = tk.Label(window, textvariable=var)
lbl_finish.grid(column=2, row=7)
def clicked_run():
var.set('')
window.update()
sleep(5)
var.set('Finshed')
btn_run = tk.Button(window, text="Run Model", command=clicked_run)
btn_run.grid(column=2, row=6)
if __name__ == '__main__':
window.mainloop()