Storing a custom Python object in Redis

Question

I'm trying to store a custom, serializable python object in Redis, but have encountered some strange behavior. The set method seems to function, but the get method only returns the value of the object's __repr__ method. For instance...

import redis

# initialize the redis connection pool
rs = redis.Redis(host='localhost', port=6379)

# define a custom class
class SomeCustomObject(object):
    pass

When I try to set the SomeCustomObject as a value, it appears to work:

>>> rs.set('c', SomeCustomObject())
True

However, when I get the value back, it's just the __repr__ string:

>>> rs.get('c')
'<__main__.SomeCustomObject object at 0x102496710>'

How do I store/get the instance back? I've not had much luck finding any info on this in the documentation, but surely I'm not the first one to encounter this?

Where are you serializing the object?

Itamar Haber
– Itamar Haber

2017-04-07 17:08:46 +00:00
Commented Apr 7, 2017 at 17:08 — Itamar Haber
– Itamar Haber, Commented Apr 7, 2017 at 17:08

Community · Accepted Answer · 2017-05-23 12:02:11Z

21

Use Pickle

Using the pickle module you can serialize and deserialize Python objects and pass them to Redis.

From this so answer - https://stackoverflow.com/a/20400288/4403600, it would look like this:

import pickle
import redis

# define a custom class
class SomeCustomObject(object):
    pass

# initialize the redis connection pool
rs = redis.Redis(host='localhost', port=6379)

# pickle and set in redis
rs.set('c', pickle.dumps(SomeCustomObject()))

# get from redis and unpickle
unpacked_object = pickle.loads(rs.get('c'))

Further reading - https://docs.python.org/2/library/pickle.html

edited May 23, 2017 at 12:02

CommunityBot

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answered Apr 7, 2017 at 17:08

Phillip Martin

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2 Comments

TayTay Over a year ago

Ah, this is great. I was (for whatever misguided reason) under the impression redis-py would handle the pickling, so long as I had the __getstate__, __setstate__ pieces handled. Thank you!

Oswaldo Zapata Over a year ago

This works! thank you so much

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