В каких случаях уместно использовать декоратор в коде?

A decorator in Python is appropriately used when you need to add additional behavior to a function or method without changing their original code. It allows implementing reusable wrappers for logging, access control, measuring execution time, and other aspects.

Examples of decorator use cases:

• Logging function calls.
• Caching results.
• Checking user permissions before executing a function.
• Measuring execution time.

A simple example of a logging decorator:

def log_calls(func):
    def wrapper(*args, **kwargs):
        print(f"Calling function {func.__name__} with arguments {args} {kwargs}")
        result = func(*args, **kwargs)
        print(f"Function {func.__name__} returned {result}")
        return result
    return wrapper

@log_calls
def add(a, b):
    return a + b

add(2, 3)

Using a decorator helps separate additional logic from the main code, making it cleaner and easier to maintain.