Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859

@echo off
rem start idle
rem Usage:  idle [-d]
rem -d   Run Debug build (python_d.exe).  Else release build.

setlocal
set exe=python
PATH %PATH%;..\..\tcltk\bin

if "%1"=="-d" (set exe=python_d) & shift

set cmd=%exe% ../Lib/idlelib/idle.py %1 %2 %3 %4 %5 %6 %7 %8 %9

echo on
%cmd%