如何使用线程添加n个自然数

import threading

# 定义一个全局变量用于存储累加结果
result = 0

def add_numbers(start, end):
    global result
    for i in range(start, end+1):
        result += i

def compute_sum_with_threads(n, num_threads):
    global result
    result = 0
    
    # 计算每个线程需要处理的数字范围
    numbers_per_thread = n // num_threads
    
    # 创建线程列表
    threads = []
    
    # 创建并启动线程
    for i in range(num_threads):
        start = i * numbers_per_thread + 1
        end = start + numbers_per_thread - 1
        
        # 对最后一个线程进行特殊处理，保证所有数字都被处理
        if i == num_threads - 1:
            end = n
        
        # 创建线程并添加到线程列表
        t = threading.Thread(target=add_numbers, args=(start, end))
        threads.append(t)
        t.start()
    
    # 等待所有线程完成
    for t in threads:
        t.join()
    
    return result

n = 1000  # 需要累加的自然数个数
num_threads = 4  # 线程数量
result = compute_sum_with_threads(n, num_threads)
print("累加结果:", result)