redis achieve leaderboards

redis of zset can be easily used to implement leaderboards, following a brief introduction on how to use python redis implement leaderboards

Join the leaderboards

Examples of obtaining redis

import redis
main_rds = redis.StrictRedis(host='localhost',port=6379,db=0,password='')

Full amount leaderboards

Note that depending on the version of the package redis, zadd zincby and pass parameters in different ways

For version (python package of redis) following redis 3.0

# 向key为name的zset里面添加一个member，其分数为score，如果已经存在就覆盖
main_rds.zadd(name,score,member)

Examples

main_rds.zadd("test",100,"a")

For (python package of redis) and above versions redis 3.0

# 向key为name的zset里面添加一个member，其分数为score，如果已经存在就覆盖
main_rds.zadd(name,{member:score})

Examples

main_rds.zadd("test",{"b":90,"c":80})   # 可以一次加入多个

Incremental leaderboards

For version (python package of redis) following redis 3.0

# # 向key为name的zset里面添加一个member，其分数为score，如果已经存在就增量添加
main_rds.zincrby(name,member,amount)

Examples

main_rds.zincrby("test","love",10)      # 10.0，一次只能加入一个
main_rds.zincrby("test","love",-1)      # 9.0

For (python package of redis) and above versions redis 3.0

# 向key为name的zset里面添加一个member，其增量分数为score，如果不存在就添加
main_rds.zincrby(name,amount,member)

Examples

main_rds.zincrby("test",8,"beauty")     # 8.0
main_rds.zincrby("test",-2,"beauty")        # 6.0

Operating rankings

Gets a member of the rankings

# 获取某个member的排名，按score从小到大排名，从0开始
main_rds.zrank(name,member)
# 获取某个member的排名，按score从大到小排名，从0开始
main_rds.zrevrank(name,meber)

Examples

main_rds.zadd("test",{"a":1,"b":2,"c":3})
main_rds.zrank("test","a")  # 0
main_rds.zrevrank("test","a")   # 2

Get a score of meber

main_rds.zscore(key,member)

Examples

main_rds.zscore("test","c")     # 3.0

Gets Ranked element in a range

# 返回key为name的zset（按score从大到小排序）中的index从start到end（顾头也顾尾）的所有元素
main.zrevrange(name, start, end, withscores=False)

Examples

main_rds.zadd("test",{"d":5.1,"e":6,"f":7})     # 3
# 顾头也顾尾
main_rds.zrevrange("test",0,3)      # ['f', 'e', 'd', 'c']

Get score element in a range

# 返回key为name的zset中score(从小到大)在给定区间（顾头也顾尾）的元素
main_rds.zrangebyscore(name, min, max, start=None, num=None, withscores=False)

Examples

# 顾头也顾尾
main_rds.zrangebyscore("test",2,6)      # ['b', 'c', 'd', 'e']

Gets score at a number of elements in a given interval

# 返回key为name的zset中score在给定区间的数量
main_rds.zcount(name, min, max)

Examples

main_rds.zcount("test",2,6)     # 4L

Gets the number of elements of the entire zset

main_rds.zcard(name)

Examples

main_rds.zcard("test")  # 6

To delete an element

# 删除key为name里面的元素
main_rds.zrem(name, *values)

Examples

main_rds.zrevrange("test",0,10)         # ['love', 'f', 'beauty']
main_rds.zrem("test","f")               # 1
main_rds.zrem("test","love","beauty")   # 2     

Ranked delete elements in a certain range

# 删除key为name的zset中排名在给定区间的元素
main_rds.zremrangebyrank(name, min, max)

Examples

main_rds.zremrangebyrank("test",0,2)    # 3

Delete score element in a range

# 删除key为name的zset中score在给定区间的元素
main_rds.zremrangebyscore(name, min, max)

Examples

main_rds.zremrangebyscore("test", 5, 6)     # 2