What are some common mistakes when using decorators in Python?

What are some common mistakes when using decorators in Python?

Some common mistakes include not returning the wrapper function, using mutable default arguments, and forgetting to use @functools.wraps.

Can you explain why using mutable default arguments is a mistake?

Using mutable default arguments can lead to unexpected behavior because the same object is shared across all calls to the function.

How can I avoid this issue?

You can use None as a default value and then initialize the mutable object inside the function if it's None.

What about the @functools.wraps decorator?

@functools.wraps helps preserve the original function's metadata, like its name and docstring, when it's wrapped by a decorator.