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merge

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Raymond Hettinger 2013-03-04 03:54:45 -05:00
commit 32e2ff5dc5
1 changed files with 11 additions and 7 deletions
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18
Lib/functools.py
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@ -291,19 +291,23 @@ def lru_cache(maxsize=128, typed=False):
# computed result and update the count of misses.
pass
elif full:
# use root to store the new key and result
root[KEY] = key
root[RESULT] = result
cache[key] = root
# use the old root to store the new key and result
oldroot = root
oldroot[KEY] = key
oldroot[RESULT] = result
# empty the oldest link and make it the new root
root = root[NEXT]
del cache[root[KEY]]
root = oldroot[NEXT]
oldkey = root[KEY]
oldvalue = root[RESULT]
root[KEY] = root[RESULT] = None
# now update the cache dictionary for the new links
del cache[oldkey]
cache[key] = oldroot
else:
# put result in a new link at the front of the queue
last = root[PREV]
link = [last, root, key, result]
cache[key] = last[NEXT] = root[PREV] = link
last[NEXT] = root[PREV] = cache[key] = link
full = (len(cache) == maxsize)
misses += 1
return result