如何修改Tkinter线程化进度条示例的窗口标题为“progress”

最简实现方式 #

窗口标题由Tkinter的主窗口实例（tk.Tk()对象）控制，直接在创建主窗口后添加一行代码即可：

ROOT = tk.Tk()
ROOT.title("progress")  # 设置窗口标题
APP = AppGUI(ROOT)
ROOT.mainloop()

原代码的其他问题修正 #

原代码存在两处会导致程序异常的问题，需要一并修正：

1. 类缩进错误：AppGUI类被错误嵌套在printmsg函数内部，需要将其移到函数外部。
2. 线程使用错误：Progress类中的线程实现逻辑有误，ttk.Progressbar.start()本身是Tkinter的内置方法，不需要额外用线程包裹；且原线程初始化写法不符合Python线程规范。修正后去掉多余的线程代码，仅保留进度条的控制逻辑（如果需要在线程中执行耗时任务，应将任务放在线程的target参数中）。

修正后的完整代码 #

"""
An example of the use of threading to allow simultaneous operations in a
tkinter gui (which is locked to a single thread)
"""

import threading
import tkinter as tk
from tkinter import ttk


class Progress():
    """ threaded progress bar for tkinter gui """
    def __init__(self,parent, row, column, columnspan):
        self.maximum = 100
        self.interval = 10
        self.progressbar = ttk.Progressbar(parent, orient=tk.HORIZONTAL,
                                           mode="indeterminate",
                                           maximum=self.maximum)
                                   
        self.progressbar.grid(row=row, column=column,
                              columnspan=columnspan, sticky="we")
        # 修正：去掉错误的线程初始化，进度条start不需要额外线程
        self.progressbar.start(self.interval)
      

    def pb_stop(self):
        """ stops the progress bar """
        VALUE = self.progressbar["value"]
        self.progressbar.stop()
        self.progressbar["value"] = VALUE

    def pb_start(self):
        """ starts the progress bar """
        VALUE = self.progressbar["value"]
        self.progressbar.configure(mode="indeterminate",
                                   maximum=self.maximum,
                                   value=VALUE)
        self.progressbar.start(self.interval)

    def pb_clear(self):
        """ stops the progress bar """
        self.progressbar.stop()
        self.progressbar.configure(mode="determinate", value=0)

    def pb_complete(self):
        """ stops the progress bar and fills it """
        self.progressbar.stop()
        self.progressbar.configure(mode="determinate",
                                   maximum=self.maximum,
                                   value=self.maximum)

def printmsg():
    """ prints a message in a seperate thread to tkinter """
    print("proof a seperate thread is running")
    

class AppGUI(tk.Frame):
    """ class to define tkinter GUI"""
    def __init__(self, parent,):
        tk.Frame.__init__(self, master=parent)
        prog_bar = Progress(parent, row=0, column=0, columnspan=2)
                
        # Button 1
        start_button = ttk.Button(parent, text="start",
                                  command=prog_bar.pb_start)
        start_button.grid(row=1, column=0)
        # Button 2
        stop_button = ttk.Button(parent, text="stop",
                                 command=prog_bar.pb_stop)
        stop_button.grid(row=1, column=1)
        # Button 3
        complete_button = ttk.Button(parent, text="complete",
                                     command=prog_bar.pb_complete)
        complete_button.grid(row=2, column=0)
        # Button 4
        clear_button = ttk.Button(parent, text="clear",
                                  command=prog_bar.pb_clear)
        clear_button.grid(row=2, column=1)
        # Button 5
        test_print_button = ttk.Button(parent, text="thread test",
                                       command=printmsg)
        test_print_button.grid(row=3, column=0, columnspan=2, sticky="we")


ROOT = tk.Tk()
ROOT.title("progress")  # 设置窗口标题
APP = AppGUI(ROOT)
ROOT.mainloop()

内容的提问来源于stack exchange，提问作者TonyF