When it comes to writing web applications, my go-to framework is usually Flask.
JSfags like Express. PHPbros swear by Laravel. They're both wrong. You should be using Flask.
On a serious note, Flask is an ideal framework if you're just getting started with web app development. Since Flask is a microframework and doesn't come with "batteries included", it forces you to make decisions about its extensibility and architecture on your own.
Need a database? Pick one - Flask doesn't force MySQL, Postgres, or Mongo on you. Want to manage user accounts? Feel free to use session-based authentication or JWT. Building a …