Python, Instance has no attribute

Question

So I'm currently trying to learn python and I'm following this guide on youtube. It put me through this. But When I run it I get the error:

Traceback (most recent call last):
  File "C:/Users/Frederik/Desktop/test.py", line 29
    app = Application(root)
  File "C:/Users/Frederik/Desktop/test.py", line 11, in __init__
    self.create_widgets()
AttributeError: Application instance has no attribute 'create_widgets'

This is my code:

from Tkinter import *

class Application(Frame):
""" GUI with click counter """

  def __init__(self, master):
    """ Init the frame """
    Frame.__init__(self,master)
    self.grid()
    self.button_clicks =0 #Counts the button clicks
    self.create_widgets()

    def create_widgets(self):
        """ Create button widget """
        self.button = Button(self)
        self.button["text"] = "Total Clicks: 0"
        self.button["command"] = self.update_count
        self.button.grid()

        def update_count(self):
            """ Increase click count """
            self.button_clicks += 1
            self.button["text"] = "Total Clicks: " + str(self.button_clicks)

root = Tk()
root.title("Button Counter")
root.geometry("200x100")

app = Application(root)

root.mainloop()

You need to indent the whole def __init__ by one indentation level to ensure that the method belongs to the type. — poke
– poke, Commented Oct 26, 2015 at 13:29
you’re actually defining functions inside functions. have your defs at the same indentation level and all will be good. — 301_Moved_Permanently
– 301_Moved_Permanently, Commented Oct 26, 2015 at 13:32
you simply has to unindent each def statement (including func body). — Łukasz Rogalski
– Łukasz Rogalski, Commented Oct 26, 2015 at 13:42

Sanna Keller-Heikkila · Accepted Answer · 2015-10-26 13:36:34Z

As Mathias commented, the problem is in your indentation. Python requires proper indentation, as that's how it determines the beginning and ending of blocks.

Here is how your code should look:

from Tkinter import *

class Application(Frame):
    """ GUI with click counter """

    def __init__(self, master):
        """ Init the frame """
        Frame.__init__(self,master)
        self.grid()
        self.button_clicks =0 #Counts the button clicks
        self.create_widgets()

    def create_widgets(self):
        """ Create button widget """
        self.button = Button(self)
        self.button["text"] = "Total Clicks: 0"
        self.button["command"] = self.update_count
        self.button.grid()

    def update_count(self):
        """ Increase click count """
        self.button_clicks += 1
        self.button["text"] = "Total Clicks: " + str(self.button_clicks)

root = Tk()
root.title("Button Counter")
root.geometry("200x100")

app = Application(root)

root.mainloop()

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