为什么在tkinter中点击按钮调用Toplevel窗口时需要等数据处理完后才弹出窗口

为什么在tkinter中点击按钮调用Toplevel窗口时需要等数据处理完后才弹出窗口，而不是点击按钮后一直显示Toplevel窗口观看其标签的变动？

import time
from collections import OrderedDict
import tkinter as tk

def t_tuple(win):
    top = TopLevel(win, 300, 200)
    group = []
    top.label1['text'] = '1、正在创建组合。。。。。。'
    star = time.time()
    for i in range(36-5):
        for j in range(i+1, 36-4):
            for k in range(j+1, 36-3):
                for l in range(k+1, 36-2):
                    for n in range(l+1, 36-1):
                        for m in range(n+1, 36):
                            result_int = [i, j, k, l, n, m]
                            result_int.sort()

                            str1 = '-'.join(map(str, result_int))
                            group.append(str1)
    end = time.time()
    top.label1['text'] = '1、组合创建完成，用时：%.2f' % (end-star)
    top.label2['text'] = '2、开始过滤数据。。。。。。'
    star2 = time.time()
    my_list = list(OrderedDict.fromkeys(group))
    end2 = time.time()
    top.label2['text'] = '2、数据过滤完成，用时：%.2f' % (end2-star2)

def center(root , width, height):
    screen_width, screen_height = root.winfo_screenwidth(), root.winfo_screenheight()
    root.geometry(f'{width}x{height}+{(screen_width-width)//2}+{(screen_height-height)//2}')

class TopLevel(tk.Toplevel):
    def __init__(self, root, width, height):
        super().__init__(root)
        center(self, width, height)
        self.wm_overrideredirect(False)
        frame = tk.Frame(self, bg='green')
        frame.pack(side=tk.LEFT, fill='both', expand=1)
        self.label1 = tk.Label(frame, font=('微软雅黑', 10), justify=tk.LEFT, bg='green')
        self.label1.grid(row=0, column=0, padx=10, pady=1, sticky='w')
        self.label2 = tk.Label(frame, font=('微软雅黑', 10), justify=tk.LEFT, bg='green')
        self.label2.grid(row=1, column=0, padx=10, pady=1, sticky='w')
        self.buttom1 = tk.Button(frame, text='关闭', font=('微软雅黑', 10), command=self.destroy, anchor='center',
  width=10)
    self.buttom1.place(relx=0.35, rely=0.75)

    self.transient()  # 定义为临时窗口
    self.grab_set()
    self.wm_attributes("-topmost", 1)  # 将窗口置顶

if __name__ == '__main__':
    root = tk.Tk()
    root.title('测试')
    center(root, 500, 200)
    font = ('宋体', 15)
    tk.Button(root, text='启动', font=font, command=lambda:     t_tuple(root)).pack()

    root.mainloop()