python网络爬虫案例源码
时间: 2024-09-21 09:12:16 浏览: 70
Python网络爬虫是一种常用的技术,用于从网站上抓取数据。以下是一个简单的Python爬虫案例,使用了`requests`库来发送HTTP请求,`BeautifulSoup`库来解析HTML内容:
```python
# 导入需要的库
import requests
from bs4 import BeautifulSoup
# 定义目标URL
url = 'https://www.example.com'
# 发送GET请求
response = requests.get(url)
# 检查请求是否成功
if response.status_code == 200:
# 解析HTML内容
soup = BeautifulSoup(response.text, 'html.parser')
# 查找并提取特定的数据,例如所有链接
links = [a['href'] for a in soup.find_all('a', href=True)]
# 打印提取到的链接
for link in links:
print(link)
else:
print(f"请求失败,状态码:{response.status_code}")
相关问题
python爬虫案例源码
Python爬虫是一种常见的网络数据抓取技术,它通过编写脚本去自动化访问网站并提取所需信息。下面是一个简单的Python爬虫案例,使用了requests库获取网页内容,BeautifulSoup解析HTML:
```python
# 导入所需的库
import requests
from bs4 import BeautifulSoup
def simple_scraper(url):
# 发送GET请求
response = requests.get(url)
# 检查请求是否成功
if response.status_code == 200:
# 解析响应的HTML内容
soup = BeautifulSoup(response.text, 'html.parser')
# 找到需要的数据,比如标题
title = soup.find('title').text
# 输出结果
print(f"Title: {title}")
else:
print("Failed to fetch the webpage.")
# 使用爬虫
url_to_crawl = "https://www.example.com"
simple_scraper(url_to_crawl)
python爬虫案例源码csv
Python爬虫案例源码CSV通常涉及到使用像`requests`库获取网页内容,然后使用`BeautifulSoup`或`Scrapy`解析HTML数据,并将结果保存到CSV文件中。这里是一个简单的例子,我们将抓取一个网站上的商品名称和价格并存储在CSV文件:
```python
import requests
from bs4 import BeautifulSoup
import csv
# 目标URL
url = 'https://example.com/products'
# 发送请求
response = requests.get(url)
soup = BeautifulSoup(response.text, 'html.parser')
# 提取商品信息(这里假设每个商品信息在HTML中的class是'msg')
items = soup.find_all('div', class_='msg')
data = []
for item in items:
name = item.find('h2').text
price = item.find('span', class_='price').text
data.append((name, price))
# 写入CSV文件
with open('products.csv', mode='w', newline='', encoding='utf-8') as file:
writer = csv.writer(file)
writer.writerow(['Name', 'Price']) # 写表头
writer.writerows(data)
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