# 首先，導入模塊
import tkinter.filedialog
 
# 此處省略父容器的定義 ...
 
# 第2步，定義按鈕并指定觸發函數self.Command1_Cmd
self.style.configure('Command1.TButton',font=('宋體',9))
self.Command1 = Button(self.Frame1, text='打開文件', command=self.Command1_Cmd, style='Command1.TButton')
self.Command1.place(relx=0.836, rely=0.107, relwidth=0.093, relheight=0.111)
 
# 第3步，定義按鈕觸發函數，event=None不能省略
def Command1_Cmd(self, event=None):
      # tkinter提供的askopenfilename函數可以實現打開文件對話框的效果，其返回值為所選文件的絕對路徑
      filename = tkinter.filedialog.askopenfilename()
      print(filename)

from tkinter import *
from tkinter.filedialog import askdirectory

def selectPath():
    path_ = askdirectory()
    path.set(path_)

root = Tk()
path = StringVar()

Label(root,text = "目標路徑:").grid(row = 0, column = 0)
Entry(root, textvariable = path).grid(row = 0, column = 1)
Button(root, text = "路徑選擇", command = selectPath).grid(row = 0, column = 2)

root.mainloop()