redis-dict 1.2

Dictionary with Redis as storage backend

Redis Dict

Redis Dict

Dictionary with Redis as storage backend. Redis is a great database for all kinds of environments; from simple to complex. redis-dict tries to make using Redis as simple as using a dictionary. redis-dict stores data in redis with key values, this is according to Redis best practices. This also allows other non-python programs to access the data stored in redis.

Features

Dictionary

redis-dict can be used in drop in replacement of a normal dictionary as long no referenced datascructed are used. i.e no nested layout e.g values such list, instance and other dictionaries. When used with supported types in can be used a drop in for a normal dictionary.

redis-dict has all the methods and behaviours of a normal dictionary.

Types

Several python types can be saved and retrieved as the same type. As of writing, redis-dict supports the following types.

• String
• Integer
• Float
• Boolean
• None

Expire

Redis has the great feature of expiring keys, this feature is supported.

1. you can set default experition when creating redis-dict instance.

r_dic = RedisDict(namespace='app_name', expire=10)

2. With context manager you can temporarly set the default expiration time you have set. Defaults to None (do not expire)

seconds = 60
with r_dic.expire_at(seconds):
    r_dic['gone_in_sixty_seconds'] = 'foo'

Batching

Batch your requests by using Pipeline, as easy as using context manager

Example storing the first ten items of fibonacci, with one roundtrip to redis.

def fib(n):
    a, b = 0, 1
    for _ in range(n):
        yield a
        a, b = (a+b), a

with r_dic.pipeline():
    for index, item in enumerate(fib(10)):
        r_dic[str(index)] = item

Namescape

Redis-dict uses namespaces by default. This allows you to have an instance of Redis-dict per project. When looking directly at the data in redis, this gives you the advantage of directly seeing which data belongs to which app. This also has the advantage that it is less likely for apps to collide with keys, which is a difficult problem to debug.

Examples

Here are some more simple examples of Redis-dict. More complex examples of Redis-dict can be found in the tests. All functionality is tested in either assert_test.py (here) or in the unit tests (here).

    >>> from redis_dict import RedisDict
    >>> r_dic = RedisDict(namespace='app_name')
    >>> 'foo' in r_dic
    False
    >>> r_dic['foo'] = 4
    >>> r_dict['foo']
    4
    >>>

Note

This project is used by different companies in production.