How did you pop all valus in redis one time

Question

I have a list in redis key :test

[{'a': 2, 'b': 3}, {'a': 1, 'b': 2}, 
{'a': 2, 'b': 4}, {'a': 1, 'b': 5}]

I can get all the element of key:test with r_list

r_server.set_response_callback('RPOP', ast.literal_eval)
r_list = []
len = r_server.llen("test")
for item in range( r_server.llen("test") ):
    r_list.append(r_server.rpop("test"))

I want to know does Redis support pop all values
I mean that I don't have to iliterate it to get all data and delete it

Answer 1

You could get all elements of the list using LRANGE and delete the key from Redis:

def lrange_literal_eval(lst):
    return [ast.literal_eval(x) for x in lst]

r_server.set_response_callback('LRANGE', lrange_literal_eval)

r_list = r_server.lrange('test', 0, -1)
r_list.reverse()
r_server.delete('test')

If you need this operation to be atomic, use pipelines or Lua scripts.

Example for Redis pipeline:

def lrange_literal_eval(lst):
    return [ast.literal_eval(x) for x in lst]

r_server.set_response_callback('LRANGE', lrange_literal_eval)

with r_server.pipeline() as pipe:
    pipe.lrange('test', 0, -1).delete('test')
    r_list = pipe.execute()[0]
    r_list.reverse()

Answer 2

You just have to use the LRANGE command to retrieve all the items in one shot.

Check Link