python多线程下载验证码

在Python中，利用多线程进行验证码的下载通常涉及到异步IO和网络请求。你可以使用`concurrent.futures`模块，如`ThreadPoolExecutor`或`ProcessPoolExecutor`，结合像`requests`这样的库来实现。下面是一个简单的示例：

import requests
from concurrent.futures import ThreadPoolExecutor

def download_image(url):
    try:
        response = requests.get(url, timeout=5)  # 设置超时时间防止阻塞主线程
        if response.status_code == 200:
            with open('captcha.png', 'wb') as f:
                f.write(response.content)
        else:
            print(f"Failed to download captcha from {url}")
    except Exception as e:
        print(f"Error downloading captcha: {e}")

# 验证码URL列表
captcha_urls = [...]  # 这里需要实际的验证码链接列表

with ThreadPoolExecutor(max_workers=5) as executor:  # 根据需要调整工作线程数
    executor.map(download_image, captcha_urls)