Use functools' @lru_cache without specifying maxsize parameter

Question

The documentation for lru_cache gives the function definition:

@functools.lru_cache(maxsize=128, typed=False)

Th

Answer 1

On Python 3.8+ you can use @lru_cache without parentheses, so your code snippet will work

Python 3.8.0 (default, Oct 28 2019, 16:14:01) 
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import functools
>>> @functools.lru_cache
... def f():
...     return 2
... 
>>> 

This was added on May 26, 2019 in commit b821868e.

On Python 3.7 or below you have to do @lru_cache(). As in, add parentheses after @lru_cache