Create Notepad.py

from tkinter import *
from tkinter import filedialog

root = Tk()
root.geometry("500x600")

def save_file():
    open_file = filedialog.asksaveasfile(mode='w',defaultexttension='.txt')
    if open_file is None:
        return
    text =str(entry.get(1.0,END))
    open_file.write(text)
    open_file.close()

def clear():
    entry.delete(1.0,END)

def open_file():
    file = filedialog.askopenfile(mode='r',filetype=[('text files','*.txt')])
    if file is not None:
        content= file.read()
    entry.insert(INSERT,content)

b1 = Button(root,text='save file',command=save_file)
b1.place(x=10,y=10)

b2 = Button(root,text='clear',command=clear)
b2.place(x=70,y=10)

b3 = Button(root,text='open file',command=open_file)
b3.place(x=120,y=10)

entry = Text(root,height=33,width=58,wrap=WORD)
entry.place(x=10,y=50)

root.mainloop()