How can I pass arguments to Tkinter button's callback command?

Question

I got 2 buttons, respectively named 'ButtonA', 'ButtonB'. I want the program to print 'hello, ButtonA' and 'hello, ButtonB' if any button is clicked. My code is as follows:

def sayHi(name):
    print 'hello,', name

root = Tk()
btna = Button(root, text = 'ButtonA', command = lambda: text)
btna.pack()

When I click ButtonA, error occurs, text not defined.

I understand this error, but how can I pass ButtonA's text to lambda?

possible duplicate of [passing argument in python Tkinter button command](http://stackoverflow.com/questions/6920302/passing-argument-in-python-tkinter-button-command). The other happened 5 hours before by another user. Amazing coincidence! — Ciro Santilli Путлер Капут 六四事, Jan 15 '14 at 11:07

score 27 · Accepted Answer · answered Aug 03 '11 at 06:57

27

This should work:

...
btnaText='ButtonA'
btna = Button(root, text = btnaText, command = lambda: sayHi(btnaText))
btna.pack()

For more information take a look at Tkinter Callbacks

answered Aug 03 '11 at 06:57

Ocaso Protal

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I needed to call my function using `lambda: self.MyFunction(MyParam)` not sure if its worth an edit? – WhatsThePoint Feb 06 '17 at 09:12

Senthil Kumaran · Answer 2 · 2011-08-03T12:00:55.920

3

text is not a function in your case. Just have it as:

value = 'ButtonA'
btna = Button(root, text = value, command = lambda: sayHi(value))

And you will get that working.

edited Aug 03 '11 at 12:00

answered Aug 03 '11 at 06:57

Senthil Kumaran

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This answer does not show how to print "hello, " like the question asks. – Bryan Oakley Aug 03 '11 at 10:56
Okay, I did not read the question completely. You just have define the text value before and send it to the lamdba callback. – Senthil Kumaran Aug 03 '11 at 12:00

How can I pass arguments to Tkinter button's callback command?

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