Benchmark different pre-ordered sorted sets insertion times to win the bounty at http://stackoverflow.com/questions/28499034/most-efficient-way-to-insert-an-already-sorted-set-into-redis

main.py

import redis
import random
import timeit

key = 'so_bounty'
number = 100
sample = 10000

r = redis.Redis()

def ascset():
    s = []

    for i in range(sample):
        s.append('value:' + `i`)
        s.append(i)

    return s

def dscset():
    s = []

    for i in range(sample,0,-1):
        s.append('value:' + `i`)
        s.append(i)
    
    return s

def rndset():
    s = []

    for i in range(sample):
        s.append('value:' + `i`)
        s.append(random.randrange(sample))

    return s

def zeroset():
    s = []  

    for i in range(sample):
        s.append('value:' + `i`)
        s.append(0)

    return s

if __name__ == '__main__':

    stmt = "i = i + 1; r.zadd(key + ':' + `i`, *s)"

    setup = ("from __main__ import r; " +
        "from __main__ import key;" +
        "from __main__ import sample;" +
        "r.flushdb(); " +
        "i = 0; " +
        "from __main__ import {};" +
        "s = {}();")

    print("ascending order")
    print(timeit.timeit(stmt=stmt, setup=setup.format("ascset", "ascset"), number=number))

    print("descending order")
    print(timeit.timeit(stmt=stmt, setup=setup.format("dscset", "dscset"), number=number))

    print("random order")
    print(timeit.timeit(stmt=stmt, setup=setup.format("rndset", "rndset"), number=number))

    print("0 score")
    print(timeit.timeit(stmt=stmt, setup=setup.format("zeroset", "zeroset"), number=number))