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Dictionary with auto-expiring values for caching purposes

Project description

Expiring Dict


expiringdict is a Python caching library. The core of the library is ExpiringDict class which is an ordered dictionary with auto-expiring values for caching purposes. Expiration happens on any access, object is locked during cleanup from expired values. ExpiringDict can not store more than max_len elements - the oldest will be deleted.

Note: Iteration over dict and also keys() do not remove expired values!


If you wish to install from PyPi:

pip install expiringdict

If you wish to download the source and install from GitHub:

git clone
python install

or to install with test dependencies (Nose, Mock, coverage) run from the directory above:

pip install -e expiringdict[test]

To run tests with coverage:

nosetests --with-coverage --cover-package=expiringdict


Create a dictionary with capacity for 100 elements and elements expiring in 10 seconds:

from expiringdict import ExpiringDict
cache = ExpiringDict(max_len=100, max_age_seconds=10)

put and get a value there:

cache["key"] = "value"

copy from dict or OrderedDict:

from expiringdict import ExpiringDict
my_dict['test'] = 1
cache = ExpiringDict(max_len=100, max_age_seconds=10, items=my_dict)
assert cache['test'] == 1

copy from another ExpiringDict, with or without new length and timeout:

from expiringdict import ExpiringDict
cache_hour = ExpiringDict(max_len=100, max_age_seconds=3600)
cache_hour['test'] = 1
cache_hour_copy = ExpiringDict(max_len=None, max_age_seconds=None, items=cache_hour)
cache_minute_copy = ExpiringDict(max_len=None, max_age_seconds=60, items=cache_hour)
assert cache_minute_copy['test'] == 1

pickle :

import dill
from expiringdict import ExpiringDict
cache = ExpiringDict(max_len=100, max_age_seconds=10)
cache['test'] = 1
pickled_cache = dill.dumps(cache)
unpickled_cache = dill.loads(cache)
assert unpickled_cache['test'] == 1

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