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safecache is a thread-safe and mutation-safe LRU cache for Python

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A thread-safe and mutation-safe LRU cache for Python.


  • All cached entries are mutation-safe.
  • All cached entries are thread-safe.
  • Customizable cache-miss behavior.
  • Zero third-party dependencies.


safecache preserves the functools.lru_cache's API so no extra learning is needed.

To migrate from lru_cache to safecache, you can simply rename the decorators!


from functools import lru_cache

@lru_cache(maxsize=32, typed=True)
def function(*a, **kw):


from safecache import safecache

@safecache(maxsize=32, typed=True)
def function(*a, **kw):

And now you get all the benefits of lru_cache with the enhancements of safecache.

For more advanced usage of safecache, please refer to the documentations.



safecache is under MIT License.

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Files for safecache, version 0.4.0
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