You know that Python is a dynamically typed programming language. That means you don't specify the type of variable while declaring it but it depends on the value it holds.
If you don't know what type of value a variable holds, pass it to the type() function.
Prettier is the code formatter extension. It enforces a consistent style by parsing your code and re-printing it with its own rules that take the maximum line length into account, wrapping code when necessary.