http://hg.python.org/cpython/rev/2adcd28a5a3a changeset: 76649:2adcd28a5a3a parent: 76643:399cb1afb747 user: Raymond Hettinger <python@rcn.com> date: Sun Apr 29 14:55:27 2012 -0700 summary: Factor out shared variables. files: Lib/functools.py | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-) diff --git a/Lib/functools.py b/Lib/functools.py --- a/Lib/functools.py +++ b/Lib/functools.py @@ -167,18 +167,20 @@ # The internals of the lru_cache are encapsulated for thread safety and # to allow the implementation to change (including a possible C version). + # Constants shared by all lru cache instances: + kwd_mark = (object(),) # separate positional and keyword args + sentinel = object() # unique object used to signal cache misses + _len = len # localize the global len() function + PREV, NEXT, KEY, RESULT = 0, 1, 2, 3 # names for the link fields + def decorating_function(user_function): cache = {} hits = misses = 0 - kwd_mark = (object(),) # separate positional and keyword args cache_get = cache.get # bound method to lookup a key or return None - sentinel = object() # unique object used with cache_get - _len = len # localize the global len() function lock = Lock() # because linkedlist updates aren't threadsafe root = [] # root of the circular doubly linked list root[:] = [root, root, None, None] # initialize by pointing to self - PREV, NEXT, KEY, RESULT = 0, 1, 2, 3 # names for the link fields def make_key(args, kwds, typed, tuple=tuple, sorted=sorted, type=type): # build a cache key from positional and keyword args -- Repository URL: http://hg.python.org/cpython