onebutton | Pocket stompbox opensource guitar processor | Audio Utils library

I have created a calculator and I have all of the buttons working. There is 1 bug that I need help fixing. The bug occurs when I add two numbers together and then press any number key.. it adds those two numbers together instead of appending the number pressed to the sum. If it's before an evaluation of an expression, it appends just fine.

For example, when I press do 1 + 1, of course output on the calculator changes to 2. Well, if I press 2 at this point, it will add the 2 to that sum instead of appending the 2 like it is expected to.

A second example for clarification, when I press the 3 button, the + button, the 3 button, and then finally the equals button, it equals 6 on the calculator. If I then press the 1 button it changes the calculator display to 7 instead of 61.

code sandbox: https://codesandbox.io/s/github/Critter4Dinner/Calculator

here is my relevant code where the issue is happening:

I am currently making a pin-code. I want to incorporate all the functions into one function, in order to integrate the button event function into one So I want to get the name of UIButton, but I don't know how.

I want to know how to add multiple click events to buttons defined in XML, as previously, in Java, we implemented View.onClickListener interface and did the rest of the work in onClick method.
Example:

So my program is a game and I am developing the menu, I am taking an OOP approach and I understand as I have been told before that the class Button should probably just handle clicking with methods. I have the buttons loading where the play/quit buttons should load first as the first stage of the menu, then the second stage has 4 buttons for easy/med/hard/vet difficulty and the third stage is level number 1/2/3/4. I had it working before with like a mix of OOP and not OOP which I don't want where I could click buttons through to each one. However now I have the problem that I am not sure how to go about OOP getting responses for loading each set of buttons and also to stop a click going through every button. Help P.S the code I am uploading does not have the images for the text on each button as well as the background and title etc. I will speech-marks or has them out except the text images because they are needed to distinguish each button

I'm rewording this with actual files I was using (but greatly stripped. And I need to quit posting when I'm half-asleep.)

Test.hpp reads:

I want to make label in Tkinter that shows progres. The destination variable need to be from entry. Label should be updated every time when progress changes

My current code:

So I am writing code for a a Stealth Game in python, I am using the pygame module for it but this problem may not even concern it. I have stages for my menu where I am taking an OOP approach (I am new to OOP so please don't hate so much on my code!) where buttons are generated for a menu where there is a play and quit button. Then Easy, medium, hard and veteran buttons are loaded on top of the old buttons (where the previous buttons lose functionality) and then the 1, 2 , 3 and 4 buttons for levels are loaded again on top of the previous ones if that makes sense. However, the way I wrote my code, I need for the variable stage where stage 1 is the play and quit, 2 is the difficulty and 3 is the level number to be passed out the method and class it would need to be in. I don't know how to do this without declaring the variable with a global scope which defeats the purpose of OOP I think. So how do I? Because otherwise the code just takes input and goes through all the buttons to the end. Here is my code, you would need images I guess of at least the text files.

So for those of us who use Python and Django framework to develop a website, there is this awesome tool known as jinja which can be used as a template engine. For example:

Instead of hard-coding an import like this: