Tkinter assign button command in loop with lambda

Question

I\'m trying to create a few buttons (with a for) like so:

def a(self, name):
    print name

users = {\"Test\":\"127.0.0.0\", \"Test2\":\"128.0.0.0\"}
row =          


        

Answer 1

The problem is your lamba in the for loop. Your lambda is using the name variable, but the name variable gets reassigned each time through 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 lamba 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 lamba's name keyword argument each time through the loop, producing the desired effect.