How does the use of decorators affect understanding and readability of the program?

Decorators in Python allow wrapping a function or method with additional behavior, which can improve readability and code reuse if used consciously.

Pros:

• They allow separating auxiliary logic (e.g., logging, permission checks, caching) from the main logic.
• They make the code more modular and cleaner.

Cons:

• If decorators are complex or numerous, it can make understanding the code more difficult, especially for beginners.
• Sometimes it's hard to trace what exactly happens when a function is called, as behavior is changed "behind the scenes".

It's important to use clear decorator names and not to overuse them to avoid reducing readability. Good practice is to document what the decorator does.