Thread-safe lru cache decorator based on double link list and dict （OrderedDict）
pip install lru_cache
from cache import LruCache
# maxsize the max number of cache object
# timeout the max time(second) cache object stay
@LruCache(maxsize=2, timeout=1)
def foo(num):
return num
# invalidate cache
foo.invalidate(num)
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timeout is not updated in real time
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LruCache doesn't support unhashable obejct