How to use Python decorators to modify functions with other functions, simplifying complex code

The video tutorial explains Python decorators, which allow centralized modification of function behaviors. It starts with a basic example of a decorator that does not alter function behavior, then progresses to a more complex example that modifies behavior using wrapper functions. A practical use case is demonstrated with a decorator for user validation in database access functions. Finally, the tutorial covers nesting decorators and their order of execution.

What is the significance of having validation logic in a decorator rather than in the function itself?

How do nested decorators work, and what is their effect on function behavior?