@lru_cache on functions with no arguments

[Ian Kelly]

On Thu, Aug 3, 2017 at 11:18 AM, Serhiy Storchaka <storchaka at gmail.com> wrote:
> $ ./python -m timeit -s 'import sys; sys.modules["_functools"] = None; del
> sys.modules["functools"]; from functools import lru_cache; f =
> lru_cache(maxsize=None)(int)' -- 'f()'
> 100000 loops, best of 5: 3.39 usec per loop

Interesting, I had tried that and it didn't work for me:

$ python3.6 -m timeit -s 'import sys; sys.modules["_functools"] =
None; del sys.modules["functools"]; from functools import lru_cache; f
= lru_cache(maxsize=None)(int)' -- 'f()'
Could not import runpy module
Traceback (most recent call last):
  File "/usr/lib/python3.4/runpy.py", line 14, in <module>
    import importlib.machinery # importlib first so we can test #15386 via -m
  File "/usr/lib/python3.4/importlib/__init__.py", line 34, in <module>
    _w_long = _bootstrap._w_long
AttributeError: module 'importlib._bootstrap' has no attribute '_w_long'