Dont | Small set of defensive programming utilities | Web Framework library

I am trying to get the best combination to reach the best R Squared and P value. In this case, I have 6 columns to run the code, but I have the R-Squared and P values just for this combo ([col0, col1, col2, col3, col4, col5] vs [col6]). I want to test all the possible combinations, something like:

[col0] vs [col6]

[col0 + col1] vs [col6]

[col0 + col1 + col2] vs [col6]...

Is there any way to automatize this? So I dont have to run all possible combinations on hand.

Iam using EventChannel to handle events from hardware barcode scanner. EventChannel is initialized in initState, in main class - it works through whole app. While change is detected, it inserts value into global variable (ValueNotifier - i dont know, if it is right) and then I need to work with that value in multiple widgets. I need some sort of widget, which will tell me, that value updated and it will trigger onEvent function - something like RawKeyboardListener. I tried using listeners, but when i do pushNamed, the listener is still listening and it runs code from previous pages, while scanning.

Is there any widget, that would be suitable for me? (cant use ValueListenableBuilder, because it has no "onEvent" function) Or is there any way, to remove and add listeners while moving between pages, or while modal bottom sheet is opened? (I need to access previous listeners, after Navigator.pop)

I dont know what am I doing wrong... In constructor, I wanna receive a Class of an enum, and I want to return the correct enum, when a value passed as parameter to convert().

I am using Formik for a bunch of admin console forms that I have in my application. So far I did not have this use case.

My Formik forms use one of 2 custom components, either a Myinputtext(input box) or a MySelect(drop down). I dont have a need for any other components so far. Here is how my Myselect component looks like.

How to get the return value? Attach my code. My intention: Want to check the QListWidget and if it's empty, a message Box popup will raise and ask the option from the user. Problem: At the stage of beginning itself, a Message box popup will display, (I don't want it at the beginning stage), If the QListwidget is empty then the MessageBox popup will display as desired, and if we select "Yes" or " No" Button, Nothing will return/print in the first file. How to resolve?

Main

I have 2 tables like below :

this is my qframe object

All im trying to do is assign the dice vlaues into the array but the values just dont change

I have the table retrieve from database. Each row have its own action column where there is radio button like po,ao,rac,rap,cancel,hold and ids are supplied via hidden field. How can I loop through all the datas and all respective ids to update in the database.My Database table name is docs where radio button values should submit updated in payment_comment field in database: I dont understand how to loop through all respective ids and update in database.

Here is my view: