Python Tkinter button

Question

    refreshButton = Button(frameList, text ="Refresh",command = print("pressed"))
    refreshButton.place(x=50, y=50)

Why does this code not print out "pressed" everytime i press the button but only once when the button is created?

There are no error messages. the problem is that print("pressed") does not execute.

score 1 · Answer 1 · answered Nov 27 '16 at 15:06

1

use lambda:

refreshButton = Button(frameList,
    text ="Refresh",
    command = lambda: print("pressed")
  )

answered Nov 27 '16 at 15:06

lycuid

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Tom Fuller · Answer 2 · 2016-11-27T17:39:56.623

0

A button command can't give any parameters unless you use lambda or some other function. Instead you need to make your own function to call when the button is pressed.

def Refresh(*args):
    print("pressed")
    # do stuff

refreshButton = Button(frameList, text ="Refresh",command = Refresh)
refreshButton.place(x=50, y=50)

If all you want to do is print("pressed") then this is the alternative solution. lambda will catch any parameters given by the button and let you call a function with your own parameters :)

refreshButton = Button(frameList, text ="Refresh",command= lambda *args: print("pressed"))

edited Nov 27 '16 at 17:39

answered Nov 27 '16 at 15:00

Tom Fuller

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i want to call a function from another object later on. print("pressed") was just a temporary thing to test the button – Peanutpower Nov 27 '16 at 15:15
Alright, though I don't see why you've added your own answer which is the same as the other two answers...? – Tom Fuller Nov 27 '16 at 15:30
_"... unless you use lambda"_ is not entirely true. There are other ways to pass arguments besides using `lambda`. – Bryan Oakley Nov 27 '16 at 16:30
I see, i'll edit that out :) – Tom Fuller Nov 27 '16 at 17:39

Python Tkinter button

2 Answers2