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 avoid this by using None as the default value and then initializing the mutable object inside the function.

What is @functools.wraps and why is it important?

@functools.wraps is a decorator that helps preserve the metadata of the original function when creating a wrapper.