使用用户定义的url和文件名构建python网络抓取器函数。

import urllib.request
import os

def web_crawler(url, file_name):
    try:
        # 发起网络请求
        response = urllib.request.urlopen(url)
        
        # 读取响应内容
        data = response.read()
        
        # 构建文件路径
        file_path = os.path.join(os.getcwd(), file_name)
        
        # 写入文件
        with open(file_path, 'wb') as file:
            file.write(data)
        
        print("文件下载成功！")
        
    except Exception as e:
        print("文件下载失败：", str(e))

web_crawler("https://example.com/image.jpg", "image.jpg")