Python Tkinter one callback function for two buttons -

i have been looking around long time answers question still hasn't find anything. creating gui using tkinter, , have 2 buttons same thing except receive information different widgets. 1 button entry widget , other listbox widget. callback function these 2 buttons long (about 200 lines), don't want have separate functions each button. have if-statements in beginning of callback function check button clicked, , codes take corresponding value. not sure if following code shows right way because apparently doesn't work in program. callback function work first time, , if click other button receive error. here sample code created illustrate idea. note want check if button clicked, not want check if 'value' exists. please help.

from tkinter import *  root = tk()  def dosomething():     # right way check button clicked?     if button1:         value = user_input.get()     elif button2:         value = choice.get(choice.curselection()[0])      # more codes take 'value' input.   button1 = button(master,text='search',command=dosomething) button1.pack() button2 = button(master,text='search',command=dosomething) button2.pack()  user_input = entry(master) user_input.pack() choice = listbox(master,selectmode=single) choice.pack() #assume there items in listbox, skipped portion  root.mainloop() 

if want pass actual widget callback, can this:

button1 = button(master, text='search') button1.configure(command=lambda widget=button1: dosomething(widget)) button2 = button(master, text='search') button2.configure(command=lambda widget=button2: dosomething(widget)) 

another choice pass in literal string if don't need reference widget:

button1 = button(..., command=lambda widget="button1": dosomething(widget)) button2 = button(..., command=lambda widget="button2": dosomething(widget)) 

another choice give each button unique callback, , have callback thing unique button:

button1 = button(..., command=buttononecallback) button2 = button(..., command=buttontwocallback)  def buttononecallback():     value = user_input.get()     dosomething(value)  def buttontwocallback():     value=choice.get(choice.curselection()[0])     dosomething(value)  def dosomething(value):     ... 

there other ways solve same problem, give general idea of how pass values button callback, or how can avoid needing in first place.