python爬虫怎么存csv

<code class="python">import csv</code>

<code class="python">with open('data.csv', 'w', newline='') as csvfile:
    csvwriter = csv.writer(csvfile)</code>

<code class="python">csvwriter.writerow(['列1', '列2', '列3'])  # 写入标题行
for row in data:
    csvwriter.writerow(row)  # 循环遍历数据行并将其写入</code>

<code class="python">csvfile.close()</code>

<code class="python">import requests
from bs4 import BeautifulSoup
import csv

# 爬取网页
url = 'https://example.com/data.html'
response = requests.get(url)

# 解析HTML
soup = BeautifulSoup(response.text, 'html.parser')

# 提取数据
data = []
for row in soup.find_all('tr'):
    row_data = [column.text for column in row.find_all('td')]
    data.append(row_data)

# 打开CSV文件并写入数据
with open('data.csv', 'w', newline='') as csvfile:
    csvwriter = csv.writer(csvfile)
    csvwriter.writerow(['姓名', '年龄', '城市'])
    for row in data:
        csvwriter.writerow(row)</code>