python - Tkinter menu command action carried out before calling, Why? -

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the following producing tkinter menu 1 label "do something". running script produces "done" output immediately, means before clicking on "do something" menu label. why that? doing wrong @staticmethod? in anticipation.

import tkinter  class appmenu(object):    def __init__(self, master):     self.master = master     self.file_content = "initialised"     self.menu_bar(self.file_content)    def menu_bar(self, file_content):     menu_bar = tkinter.menu(self.master)     self.menu_bar = tkinter.menu(self.master)     self.master.config(menu=self.menu_bar)     self.task_menu = tkinter.menu(self.menu_bar, tearoff = false)     self.task_menu.add_command(label = "do something", command = convert.do(self.file_content))     self.menu_bar.add_cascade(label = "task", menu = self.task_menu)  class convert(object):   @staticmethod   def do(text):     print "done"   root = tkinter.tk() menu = appmenu(root) root.mainloop()

command argument in add_command expects function (or callable).
aren't passing function convert.do add_command, pass result of calling convert.do(self.file_content) instead of it.
pass arguments convert.do (self.file_content in case) can use lambda: 

command=lambda self=self: convert.do(self.file_content)

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