In order to run the code, you need to

• Have a (Free) account created at https://infura.io/
• Create New Project;
  • Under "Product" select "Ethereum"
  • Enter any "Project Name"
• Copy the Endpoint URL that looks like this https://mainnet.infura.io/v3/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
• Create a .env file and store INFURA_URL = "https://mainnet.infura.io/v3/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" and save the file

pip3 install -r requirements.txt

export FLASK_APP=app

export FLASK_ENV=development

flask run

Video Tutorial: https://www.youtube.com/watch?v=XcHNWuMietY