redis如何获取某个前缀的键数？

import redis

def get_keys_with_prefix(redis_host, redis_port, redis_password, prefix):
    r = redis.Redis(host=redis_host, port=redis_port, password=redis_password)
    cursor = 0
    count = 0

    while True:
        cursor, keys = r.scan(cursor, match=prefix + '*')
        count += len(keys)

        if cursor == 0:
            break

    return count

redis_host = 'your_redis_host'
redis_port = 6379
redis_password = 'your_redis_password'
prefix = 'your_prefix'

key_count = get_keys_with_prefix(redis_host, redis_port, redis_password, prefix)
print(f"The number of keys with prefix '{prefix}' is: {key_count}")