how to read and write to text files in tkinter

1from tkinter import *
2from tkinter import ttk
3from tkinter import filedialog
4
5
6
7root=Tk()
8root.title("Get Height and Width")
9
10# width=400, height=400
11root.geometry("400x500")
12
13
14def clear():
15    my_text.delete(1.0,END)
16
17#Grab the Text from the Text box
18def open_txt():
19    text_file=filedialog.askopenfilename(initialdir="D:/IT related folders and documents/",title="Open Text File",filetypes=(("Text Files", "*.txt"),))
20    text_file=open(text_file,'r')
21    stuff=text_file.read()
22    my_text.insert(END,stuff)
23    text_file.close()
24
25#Save Text File
26def save_txt():
27    text_file=filedialog.askopenfilename(initialdir="D:/IT related folders and documents/",title="Save Text File",filetypes=(("Text Files", "*.txt"),))
28    text_file=open(text_file,'w')
29    text_file.write(my_text.get(1.0,END))
30    text_file.close()
31
32my_text=Text(root,width=60,height=20)
33my_text.pack(pady=20)
34
35open_button=Button(root,text="Open Text File",command=open_txt)
36open_button.pack(pady=20)
37
38save_button=Button(root,text="Save Text File",command=save_txt)
39save_button.pack(pady=20)
40
41root.mainloop()