Menubar 菜单

import tkinter as tk

window = tk.Tk()
window.title("daxiangcai's title")
window.geometry('800x400')


def createnew():
    l.config(text='you have created a new file')

l = tk.Label(window, text='', bg='green', width=40)
l.pack()

menubar = tk.Menu(window)  # 菜单栏
filemenu = tk.Menu(menubar, tearoff=0)  # 下拉菜单；tearoff代表菜单栏跟下拉菜单之间有没有空隙
menubar.add_cascade(label='File', menu=filemenu)  # 添加下拉菜单
filemenu.add_command(label='New', command=createnew)
filemenu.add_separator()  # 添加分割线
filemenu.add_command(label='Exit', command=window.quit)

filesubmenu = tk.Menu(filemenu)  # 子下拉菜单
filemenu.add_cascade(label='More', menu=filesubmenu, underline=0)
filesubmenu.add_command(label='Coming soon')

editmenu = tk.Menu(menubar, tearoff=0)
menubar.add_cascade(label='Edit', menu=editmenu)
editmenu.add_command(label='Copy')
editmenu.add_command(label='Paste')
editmenu.add_command(label='Cut')
editmenu.add_separator()

window.config(menu=menubar)

window.mainloop()