How to Build a Redis Leaderboard with ZREVRANGE in Python

import redis
import random

# Connect to local Redis (ensure Redis is running on localhost:6379)
r = redis.Redis(host="localhost", port=6379, db=0, decode_responses=True)

# Clear any existing test data
r.delete("game_scores")

# Simulate player scores
players = ["alice", "bob", "charlie", "dave", "eve"]
for player in players:
    score = random.randint(100, 1000)
    r.zadd("game_scores", {player: score})

# Add a few +1 increments for variety
r.zincrby("game_scores", 50, "alice")
r.zincrby("game_scores", 10, "bob")

# Fetch top 3 players (highest scores) using ZREVRANGE
top_players = r.zrevrange("game_scores", 0, 2, withscores=True)

# Display the leaderboard
print("Top 3 Leaderboard:")
for rank, (player, score) in enumerate(top_players, start=1):
    print(f"{rank}. {player}: {score}")

# Fetch a specific range (e.g., players ranked 2-4)
middle_players = r.zrevrange("game_scores", 1, 3, withscores=True)
print("\nRanks 2-4:")
for rank, (player, score) in enumerate(middle_players, start=2):
    print(f"{rank}. {player}: {score}")

# Show the full leaderboard for reference
print("\nFull Leaderboard (sorted by score descending):")
all_players = r.zrevrange("game_scores", 0, -1, withscores=True)
for rank, (player, score) in enumerate(all_players, start=1):
    print(f"{rank}. {player}: {score}")

# Clean up test data
r.delete("game_scores")