Hi Paul

I get a syntax error. The code won't even compile. I don't see how your code can avoid it. Are you sure your example works?

$ python3.8
Python 3.8.0 (default, Oct 28 2019, 16:14:01)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> @TimeIt
... time.sleep(1)
  File "<stdin>", line 2
SyntaxError: invalid syntax

By the way, I noticed that python 3.9 implements pep 614, but I don't see how that could allow your example to work.

If I've made a stupid mistake, please be kind to me.