Tkinter not display window; declared as part of class

Question

Running VSCode with MS Python extension and my window will not display here's my code

import tkinter as tk

class FormMain:

    def __init_(self):
        self.build_controls()


    def build_controls(self):
      self.form_main = tk.TK()
      self.form_main.title("Staff Manager")
      
      self.form_main.mainloop()


form = FormMain()

__init_ should be __init__ instead.

acw1668
– acw1668

2025-11-14 11:25:23 +00:00
Commented Nov 14 at 11:25 — acw1668
– acw1668, Commented Nov 14 at 11:25

Peter Alexander Christiaans · Accepted Answer · 2025-11-14 08:57:01Z

1

First issue might be that you have to call the function. You have only defined it, without running it. So add the line at the bottom of your code:

form.build_controls()

Another issue might be that this line may have a casing issue:

self.form_main = tk.TK()

may have to be (note Tk()):

self.form_main = tk.Tk()

Does this help you out?

And to add, there may be a misspelling in the __init__() method, but that may also be the result of formatting on this website.

edited Nov 14 at 8:57

answered Nov 14 at 8:37

Peter Alexander Christiaans

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2 Comments

Randino Nov 14 at 13:07

Fantastic! That work. I corrected the TK() to Tk() and called the function.

Randino Nov 14 at 13:12

When I used two underscores before and after the init in the def statement I did not need tor run the function

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