CODEWITHSUNDEEP
pythonpython-3.xtkinter
Christian Abdelmassih
Christian Abdelmassih

Reputation: 194

Python3: function call from pressing tkinter.button

Please note that this is written in python 3

I am using Tkinter and am trying to call the foo-function by pressing the button in the tk-window and get "Hello World!" printed, what am I doing wrong? 

from tkinter import *
window1 = Tk()

class WidgetCreate(object):

    def __init__(self, widget_type, window_num, text_str, fun, numr, numc):
        self.obj = Button(window_num, text=text_str, command=lambda: fun)
        self.obj.grid(row=numr, column=numc)

def foo():
    print("Hello World!")       

but1 = WidgetCreate("Button", window1, "This Button 1", foo, 1, 1)

window1.mainloop()

The button is visible in the to-window however when pressed nothing happens :(

Upvotes: 0

Views: 390

Answers (1)

TobiMarg
TobiMarg

Reputation: 3797

You miss the parenthesis in your command argument to Button. So your lambda function doesn't call the function you want. It has to be:

self.obj = Button(window_num, text=text_str, command=lambda: fun())

Or even simpler you do it without the lambda function and give fun directly as argument:

self.obj = Button(window_num, text=text_str, command=fun)

Upvotes: 2

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