Python Event binding on label , Event and binding in differents class

Question

My Problem is that i have the binding from the label to his event and the event in different classes but i dont know really how to assign to the label the event in the class.I try it so:

class WindowInhalt():
    def label(self):
        label = Label(self.tkWindow, text="What the fuck", fg="black",bg="lightyellow", font=('Arial', 14))
        label.bind("<Button-1>", EventsBinding.Test) #here is the assign
        label.place(x=300, y=50, width="200", height="20")

And here is the event class:

class EventsBinding(WindowInhalt):
    def Test(self, event):
        print("gedrückt")

When i start it so i get this error:

Traceback (most recent call last):
  File "D:\Programme\python\Lib\tkinter\__init__.py", line 1699, in __call__
    return self.func(*args)
TypeError: callback() missing 1 required positional argument: 'event'

If anybody can help me i am gratefull ^^

EDIT 1: Here is the full code

#Mein Erstes Gui Python Programm mit Tkinter
#Created: July,2017
#Creator: Yuto
from tkinter import *

#class für den Inhalt des Windows z.b. label
class WindowInhalt():
    def label(self):
        label = Label(self.tkWindow, text="What the fuck", fg="black",bg="lightyellow", font=('Arial', 14))
        label.bind("<Button-1>", EventsBinding.Test)
        label.place(x=300, y=50, width="200", height="20")


class EventsBinding(WindowInhalt):
    def Test(self, event):
        print("gedrückt")


#class für das Window an sich hier wird dann auch z.b. Inhalt eingebunden
class Window(WindowInhalt):
    def __init__(self):
        super().__init__()
        self.tkWindow = Tk()
        self.label()
        self.windowSettings()

    #settings für das window z.b. größe
    def windowSettings(self):
        self.tkWindow.configure(background="lightyellow")
        self.tkWindow.title("GUI LALALLALALA")
        self.tkWindow.wm_geometry("800x400+600+300")
        self.tkWindow.mainloop()


#Only ausführen wenn es nicht eingebunden ist
if __name__ == "__main__":
    print("starten")
    w = Window()
else:
    print("Dise Datei bitte nicht einbinden!")

How are you initializing an instance? You just show the error. — JClarke
– JClarke, Commented Jul 25, 2017 at 15:27

Bryan Oakley · Accepted Answer · 2017-07-25 15:32:09Z

2

In your code you need to create an instance of EventsBinding, and then call the method on that instance

events_binding = EventsBinding(...)
...
label.bind("<Button-1>", events_binding.Test)

If you don't want to create an instance, you'll need to define your method as a static method

class EventsBinding(WindowInhalt):
    @staticmethod
    def Test(event):
        print("gedrückt")

answered Jul 25, 2017 at 15:32

Bryan Oakley

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2 Comments

Bryan Oakley Over a year ago

@Yuto: this isn't anything unique to Tkinter. This is simply how python classes work.

Lupos Over a year ago

Yeah i think about it and than i know it.But on this moment i forgot that i have to do this.

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