用python从网页上爬取图片

可以使用Python中的Requests和BeautifulSoup库来实现从网页上爬取图片的功能。具体步骤如下：

1. 导入所需库：

import requests
from bs4 import BeautifulSoup
import os

2. 发送请求并解析网页：

url = "http://www.example.com"
response = requests.get(url)
soup = BeautifulSoup(response.text, 'html.parser')

3. 找到所有的图片链接：

img_urls = []
for img in soup.find_all('img'):
    img_urls.append(img.get('src'))

4. 下载图片到本地：

for url in img_urls:
    response = requests.get(url)
    img_name = os.path.basename(url)
    with open(img_name, 'wb') as f:
        f.write(response.content)

完整代码示例：

import requests
from bs4 import BeautifulSoup
import os

url = "http://www.example.com"
response = requests.get(url)
soup = BeautifulSoup(response.text, 'html.parser')

img_urls = []
for img in soup.find_all('img'):
    img_urls.append(img.get('src'))

for url in img_urls:
    response = requests.get(url)
    img_name = os.path.basename(url)
    with open(img_name, 'wb') as f:
        f.write(response.content)

注意：在实际应用中，需要根据具体情况进行适当的错误处理和异常处理。