Waffle | Library for writing and testing smart contracts

Apologies, this has been done to death but I am really struggling to implement a solution to this problem and I am quite new to Java.

I need to be able to call a method which basically allows a Person object to be added to a list.

The main problem I have encountered whilst trying to implement a solution is a 'ConcurrentModificationException' which is understandable given I have been trying to update the list whilst in the middle of a for each loop.

So, I have come up with the following solution which prevents the 'ConcurrentModificationException' but my solution doesn't work properly and seems overcomplicated - see following code snippet of method:

I have a jupyter notebook with an ipydatagrid widget that displays a dataframe. This notebook works correctly when run locally, but not when run in AWS SageMaker Studio. When run in SageMaker Studio, instead of showing the widget it simply shows the text Loading widget...

How does one use a ipydatagrid widget in the SageMaker Studio environment?

Python version:

So pretty much I am trying to create an application that interacts with a database but cannot seem to get either one to work. Either the require causes an issue or the document keyword does (dependant on which I start from) I was just wondering if anyone knew a fix to this? I was trying to use classes and methods so I could split up the files as well but just doesnt want to work

I am very open to using another library or framework if need be so if you have any recommendations please let me know.

Here is my main.js

I'm trying to build an NFT Market place.

For some reason, npm run dev stopped working after I exited VSCode (was running completely fine yesterday). Even tried to work on it today and had the same error but then deleted node_modules & package-lock.json and then reinstalled using npm install and it worked fine. But retrying the same thing now it's not working at all and won't let me fetch my functions from NFTMarketPlace.sol.

(I put below all the appropriate code I believe might help) Please help me fix this. I'm new to React/Next.js. Thank you!

package.json

While trying to set up a basic self-hosted unit testing environment (and CI) that tests this Chainlink VRF random number contract, I am experiencing slight difficulties in how to simulate any relevant blockchains/testnets locally.

For example, I found this repository that tests Chainlinks VRF. However, for default deployment it suggests/requires a free KOVAN_RPC_URL e.g. from Infura's site and even for "local deployment" it suggests/requires a free MAINNET_RPC_URL from e.g. Alchemy's site.

I adopted a unit test environment from the waffle framework which is described as:

Attempting to make a simple waffle chart with the below vector pie:

I'm trying to deploy a CNN model created using Tensorflow to Heroku with FastAPI. The app runs on Heroku but returns an error when trying to make model predictions. Running heroku logs --tail returns this:

I have deployed a ERC-1155 based contract (based on OpenZeppelin) and minted some NFTs on this contract successfully. But when I want to use these NFTs in OpenSea, it always says "Unidentified contract".

Example: https://testnets.opensea.io/assets/0xc7d3e4a5A0c3e14ba8C68ea1b8a99a9dBf3ca76F/2

API-Example: https://testnets-api.opensea.io/api/v1/asset/0xc7d3e4a5A0c3e14ba8C68ea1b8a99a9dBf3ca76F/2/?force_update=true

Following their official Tutorial repository (which does not compile any more because of outdated dependencies and other issues) I have added some (maybe) opensea-specific functions and data that might required for OpenSea in order to work properly. However, OpenSea is able to grab all required data to display an NFT, but as long as they say "Unidentified contract", this all makes no sense so far.

My question has:

has someone already managed to deploy a ERC-1155 and used it with OpenSea properly without this issue? Is there anything we have to "register" somehow contracts that are not based on ERC-721?

I've been working with the package waffle and I can't solve how to fix this waffle plot so that it shows 100 squares/cells

This is the data and my code: