Redis: How to parse a list result

Question

I am storing a list in Redis like this:

redis.lpush('foo', [1,2,3,4,5,6,7,8,9]) 

And then I get the list back like this:

redis.lrange('foo', 0, -1) 

and I get something like this:

[b'[1, 2, 3, 4, 5, 6, 7, 8, 9]'] 

How can I convert this to actual Python list?

Also, I don't see anything defined in RESPONSE_CALLBACKS that can help? Am I missing something?

A possible solution (which in my opinion sucks) can be:

result = redis.lrange('foo',0, -1)[0].decode()  result = result.strip('[]')  result = result.split(', ')  # lastly, if you know all your items in the list are integers result = [int(x) for x in result] 

UPDATE

Ok, so I got the solution.

Actually, the lpush function expects all the list items be passed as arguments and NOT as a single list. The function signature from redis-py source makes it clear...

def lpush(self, name, *values):     "Push ``values`` onto the head of the list ``name``"     return self.execute_command('LPUSH', name, *values) 

What I am doing above is send a single list as an argument, which is then sent to redis as a SINGLE item.

I should be unpacking the list instead as suggested in the answer:

redis.lpush('foo', *[1,2,3,4,5,6,7,8,9]) 

which returns the result I expect...

redis.lrange('foo', 0, -1) [b'9', b'8', b'7', b'6', b'5', b'4', b'3', b'2', b'1'] 

Answer 1

I think you're bumping into semantics which are similar to the distinction between list.append() and list.extend(). I know that this works for me:

myredis.lpush('foo', *[1,2,3,4]) 

... note the * (map-over) operator prefixing the list!

Answer 2

Another way: you can use RedisWorks library.

pip install redisworks

>>> from redisworks import Root >>> root = Root() >>> root.foo = [1,2,3,4,5,6,7,8,9]  # saves it to Redis as a list ... >>> print(root.foo)  # loads it from Redis later 

It converts python types to Redis types and vice-versa. So even if you had nested list, it would have worked:

>>> root.sides = [10, [1, 2]]  # saves it as list in Redis. >>> print(root.sides)  # loads it from Redis [10, [1, 2]] >>> type(root.sides[1]) <class 'list'> 

Disclaimer: I wrote the library. Here is the code: https://github.com/seperman/redisworks