python 2.7 - messagebox getting looped -

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i displaying message box on click of option menu when data not available , acquired. somehow whenever change content of option menu message box gets looped. like- first time vanishes when press ok. when change option again second time displays message box 2 times , third time 3 times. can tell me change in code?

#the function change option menu value def module_func(event):         #declarations          if(datetext.get()!="" , drivetext.get()!=""):                 global module_dir                 global selected_module                 modules['menu'].delete(0,end)                 select="-----select-----"                 modules['menu'].add_command(label=select, command=tk._setit(module,select))                 module_dir in get_immediate_subdirectories(('%s\%s\%s')%(startpath,selected_shot,selected_fec)):                         module_dropdown.append(module_dir)                         modules['menu'].add_command(label=module_dir, command=tk._setit(module,module_dir))                   module.trace('w',seteighttext) #think problem here           else:                 errormsg("")  def seteighttext(*args):         #declarations         if(os.path.exists(('%s\%s\%s\%s\%s')%(startpath,selected_shot,selected_fec,selected_module,chan))):                 #some operations          else:                 tkmessagebox.showinfo("error","data @ given location not available.\n please wait until data acquired.")  module=tk.stringvar(labelframe1) module.set("-----select-----") modules = tk.optionmenu(labelframe1, module, module_dropdown, command=module_func) modules.config(width=20, background="snow") modules.grid(row=8, column=2, sticky="w", padx=10, pady=5) modules.bind('<button-1>',module_func)

i think problem because of trace. don't know add instead of that.


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