Python/Tkinter: Why is my cascade menu not working? -

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i'm trying learn tkinter though right i'm stuck @ 1 part. i'd have cascade menu added main menu. problem don't know i'm doing wrong. help.

from tkinter import * import tkfiledialog  class application(frame):     def __init__(self, master=none):         frame.__init__(self, master)         self.master = master         self.create_wgts()      def create_wgts(self):         self.mainmenu=menu(self.master)          self.wgt_confirm = button(text='confirm', command=self.traceback).pack(side=right)          self.wgt_entry = entry()         self.wgt_entry.pack(side=right, fill=x, expand=1, ipadx=200)         self.wgt_entry.bind('<key-return>', self.hit_enter)          self.casmenu_file = menu(self.mainmenu)         self.casmenu_file.add_command(label="open file", command=self.file_select)         self.casmenu_file.add_command(label="write file", command=self.file_write)         self.casmenu_file.add_separator()         self.casmenu_file.add_command(label="exit", command=self.traceback)          self.mainmenu.add_cascade(label='file', menu=self.casmenu_file)      def traceback(self):         print "traceback called"       def hit_enter(self, event):         print "hit enter"       def file_select(self):         print "file>open called"       def file_write(self):         print "file>write file called"   root = tk() app = application(master=root) app.mainloop()

you forgot add: self.master.config(menu=self.mainmenu)

here's full code listing:

from tkinter import * import tkfiledialog  class application(frame):     def __init__(self, master=none):         frame.__init__(self, master)         self.master = master         self.create_wgts()      def create_wgts(self):         self.mainmenu=menu(self.master)          self.wgt_confirm = button(text='confirm', command=self.traceback).pack(side=right)          self.wgt_entry = entry()         self.wgt_entry.pack(side=right, fill=x, expand=1, ipadx=200)         self.wgt_entry.bind('<key-return>', self.hit_enter)          self.casmenu_file = menu(self.mainmenu)         self.casmenu_file.add_command(label="open file", command=self.file_select)         self.casmenu_file.add_command(label="write file", command=self.file_write)         self.casmenu_file.add_separator()         self.casmenu_file.add_command(label="exit", command=self.traceback)          self.mainmenu.add_cascade(label='file', menu=self.casmenu_file)         self.master.config(menu=self.mainmenu)      def traceback(self):         print "traceback called"       def hit_enter(self, event):         print "hit enter"       def file_select(self):         print "file>open called"       def file_write(self):         print "file>write file called"   root = tk() app = application(master=root) app.mainloop()

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