How to use browser with tktinker to use a file to make dataframe with Pandas?

Question

如你所见，我是新来的。我已经研究过答案，但找不到适合我的答案。

我想用浏览器选择一个 excel 文件（由 tktinker 创建）并将其用于我的 pandas 工作。我的代码是：

---

 from tkinter import *
 import os
 import tkinter as tk
 import shutil
 from tkinter import messagebox as mb #import the mesassage box for displaying the messages

 from tkinter import filedialog as fd
 import tkinter.ttk as ttk

# Create the root window
 window = tk.Tk()

 def browseFiles():
     file1 = fd.askopenfilename(parent=window, initialdir = "/",
                                      title = "Welches File wünschst Du",
                                      filetypes = (("Text files",
                                                    "*.txt*"),
                                                   ("Excel files",
                                                    "*.xlsx*"),
                                                   ("all files",
                                                    "*.*")))
     label_file_explorer.configure(text="File Opened: "+file1) # Change label contents
     print(file1)
     return str(file1)
 # Function for opening the
 # file explorer window

 style = ttk.Style(window)
 style.theme_use("clam")
 # Set window title
 window.title('File Explorer')
 # Set window size
 window.geometry("500x300")
 #    Set window background color
 window.config(background = "pink")

 # Create a File Explorer label
 label_file_explorer = Label(window,
                        text = "File Explorer for etamax.",
                        width = 100, height = 4,
                        fg = "blue")
 button_explore = Button(window,
                    text = "Browse Files",
                    command = browseFiles)
 button_exit = Button(window,
                 text = "Ausfahrt",
                 command = exit)

 # Grid method is chosen for placing
 # the widgets at respective positions
 # in a table like structure by
 # specifying rows and columns
 label_file_explorer.grid(column = 1, row = 1)
 button_explore.grid(column = 1, row = 2)
 button_exit.grid(column = 1,row = 3)
 # Let the window wait for any events
 window.mainloop()

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但是当我想将此文件与 pandas 一起使用时，我没有任何响应（没有错误消息或没有响应）它只是等待。 （我的 python 版本是：3.8.8）

---

 df2=pd.read_excel(file1)
 df=df2.copy()`

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提前非常感谢您的所有好心回答

我希望使用浏览器来选择文件以使用 pandas 对其进行操作