编写简单的爬虫程序，使用request、urlib，不使用os，爬取http://www.netbian.com/页面上10幅图像，并保存到本地文件夹中

在Python中，你可以使用`urllib.request`来实现基本的HTTP请求并下载图片。但是，正如你提到的，`requests`库通常更方便。下面是一个使用`requests`的简单示例，展示如何爬取指定网页上的图片并保存到本地：

import requests
from os.path import basename

# 目标URL
url = "http://www.netbian.com/"

# 模拟浏览器访问，获取HTML内容
response = requests.get(url)

# 解析HTML以找到图片链接
html = response.text
img_links = [link for link in html.split('<img') if 'src' in link]

# 下载图片并保存到本地
for i, img_link in enumerate(img_links[:10]):
    img_url = img_link.split('src="')[1].split('"')[0]
    img_name = f"image_{i}.jpg"  # 假设图片命名格式
    response = requests.get(img_url)
    with open(f"{basename(img_name)}", "wb") as f:
        f.write(response.content)

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编写简单的爬虫程序，使用request、urlib、lxml，爬取http://www.netbian.com/页面上10幅图像，并保存到本地文件夹中

要编写一个简单的爬虫程序以爬取 http://www.netbian.com/ 页面上的10幅图像并保存到本地文件夹，我们可以按照以下步骤进行：

1. 导入所需库[^1]:

import requests
from lxml import etree
import os

2. 定义目标URL:

url = "http://www.netbian.com/"

3. 设置请求头（可能需要针对网站设置适当的User-Agent）:

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'
}

4. 发送GET请求并获取页面内容:

try:
    response = requests.get(url, headers=headers)
    response.raise_for_status()
    print("成功获取源代码")
except requests.exceptions.RequestException as e:
    print(f"获取源代码失败: {e}")

5. 解析HTML内容找到图像元素:

tree = etree.HTML(response.text)
image_elements = tree.xpath('//img')[:10]  # 取前10个img元素

6. 保存图像到本地:

if image_elements:
    images_folder = 'images'
    if not os.path.exists(images_folder):
        os.makedirs(images_folder)

    for i, img_element in enumerate(image_elements, start=1):  # 序号从1开始
        img_url = img_element.attrib['src']
        img_name = f'image_{i}.jpg'  # 根据序号命名
        file_path = os.path.join(images_folder, img_name)

        try:
            with open(file_path, 'wb') as f:
                img_data = requests.get(img_url).content
                f.write(img_data)
                print(f"已保存图像到: {file_path}")
        except Exception as e:
            print(f"保存图像失败: {e}")
else:
    print("未找到任何图像元素")

编写简单的爬虫程序，使用request、urlib、lxml，不使用os，爬取http://www.netbian.com/页面上10幅图像，并保存到本地文件夹中

要编写一个简单的爬虫程序，使用Python的`requests`, `urllib.request`, 和 `lxml` 库来抓取网页并保存图片，你可以按照以下步骤操作：

1. **安装所需库**:

   pip install requests lxml

2. **导入所需的库**:

   import requests
   from bs4 import BeautifulSoup
   import urllib.request

3. **定义URL和下载路径**:

   url = "http://www.netbian.com/"
   download_path = "./images"  # 创建一个用于存储图片的目录（如果不存在）
   if not os.path.exists(download_path):
       os.makedirs(download_path)

4. **发送GET请求并解析HTML**:

   response = requests.get(url)
   soup = BeautifulSoup(response.text, "lxml")

5. **找到图像标签并提取src属性**:

   img_tags = soup.find_all("img")  # 这里假设所有的图片都在<img>标签内
   img_urls = [img["src"] for img in img_tags]

6. **下载图片**:

   for i, img_url in enumerate(img_urls[:10]):  # 取前10张图片
       image_name = f"image_{i+1}.jpg"  # 图片名称，可以根据实际需求修改
       full_path = os.path.join(download_path, image_name)

       try:
           with urllib.request.urlopen(img_url) as img_response:
               with open(full_path, "wb") as file:
                   file.write(img_response.read())
       except Exception as e:
           print(f"Failed to download {img_url}: {e}")

完整的代码示例：

import requests
from bs4 import BeautifulSoup
import urllib.request
import os

url = "http://www.netbian.com/"
download_path = "./images"

if not os.path.exists(download_path):
    os.makedirs(download_path)

response = requests.get(url)
soup = BeautifulSoup(response.text, "lxml")

img_tags = soup.find_all("img")
img_urls = [img["src"] for img in img_tags]

for i, img_url in enumerate(img_urls[:10]):
    image_name = f"image_{i+1}.jpg"
    full_path = os.path.join(download_path, image_name)

    try:
        with urllib.request.urlopen(img_url) as img_response:
            with open(full_path, "wb") as file:
                file.write(img_response.read())
    except Exception as e:
        print(f"Failed to download {img_url}: {e}")

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