给出实现实现基本均衡算法，分块均衡算法和局部均衡的python代码

以下是三种负载均衡算法的Python实现：

1. 基本均衡算法

import random

servers = ['server1', 'server2', 'server3', 'server4']

def basic_load_balancing():
    return random.choice(servers)

print(basic_load_balancing())

2. 分块均衡算法

import itertools

servers = ['server1', 'server2', 'server3', 'server4']

def chunk_load_balancing(chunk_size=2):
    chunks = [servers[i:i+chunk_size] for i in range(0, len(servers), chunk_size)]
    cycle_chunks = itertools.cycle(chunks)
    return next(cycle_chunks)

print(chunk_load_balancing())

3. 局部均衡算法

import random

servers = {
    'server1': 10,
    'server2': 20,
    'server3': 5,
    'server4': 15
}

def local_load_balancing():
    total_weight = sum(servers.values())
    rand = random.uniform(0, total_weight)
    current_weight = 0
    for server, weight in servers.items():
        current_weight += weight
        if rand <= current_weight:
            return server

print(local_load_balancing())

以上代码仅供参考，实际应用中需要根据具体情况进行修改和优化。