Tkinter assign button command in a for loop with lambda [duplicate]

The problem is your lambda expression in the for loop. It is using the name variable, but the name variable gets reassigned each iteration of the for loop, so in the end, all of the buttons get the last value that name was assigned to in the for loop. To avoid this you can use default keyword parameters in your lambda expression like so:

user_button = Tkinter.Button(self.root, text=name,
                             command=lambda name=name: self.a(name))

This binds the current value of the name variable to the lambda’s name keyword argument each time through the loop, producing the desired effect.

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