Python menu 运行后为什么是看不见菜单（menu）

from Tkinter import *
root = Tk()
def hello():
print 'hello menu'
menubar = Menu(root)
filemenu = Menu(menubar,tearoff = 0)
for item in ['Python','PHP','CPP','C','Java','JavaScript','VBScript']:
filemenu.add_commad(label = item,command = hello)
root['menu'] = menubar
root.mainloop()

这段程序运行后为什么是空的。

后为什么是看不见菜单（menu）
menucommandpython
from Tkinter import *
root = Tk()
def hello():
print 'hello menu'
menubar = Menu(root)
filemenu = Menu(menubar,tearoff = 0)
for item in ['Python','PHP','CPP','C','Java','JavaScript','VBScript']:
filemenu.add_co

menubar = tk.Menu(root)
filemenu = tk.Menu(menubar,tearoff = 0)
for item in ['Python','PHP','CPP','C','Java','JavaScript','VBScript']:

filemenu.add_command(label=item,command = hello())
root.config(menu=filemenu)