Error while making Calculator using python

Question

I am making a calculator using python and Tkinter. But now I am stuck in an error. its saying ,
AttributeError: 'NoneType' object has no attribute 'insert'
.
When i am typing a button in my program its giving me this error.
.
Can anyone tell me how to solve this error?
where to make change for solve this problem?

code link->

https://code.sololearn.com/c6O4i4F7o8pk/#

Advance Thanks.

Answer 1

Did you have follow some tkinter tuto before starting you tkinter calculator? Because, the way you do in your code is absolutly not the usual way ^^

Usual way is to have a class (defining the window UI) and register it as a tkinker app (with the Tk main class constructor, wich you missuse => the error you're actually facing by running your script).

You would be advised to begin by following and practicing at least the quick start tuto from:

https://python-textbok.readthedocs.io/en/1.0/Introduction_to_GUI_Programming.html

Alternatively you could dive in this stackoverflow thread about tkinter without class, but that's not the recommended way:

https://stackoverflow.com/questions/47722336/how-can-i-make-this-function-without-classes-python-3-tkinter

Answer 2

Swim sir ..
I have edited my question as you said ....
Can you help me now please?