如何将Flask web界面上复选框中选中的所有数据字段存储在csv文件中

<form action="/save_data" method="POST">
  <input type="checkbox" name="field1" value="value1"> Field 1<br>
  <input type="checkbox" name="field2" value="value2"> Field 2<br>
  <input type="checkbox" name="field3" value="value3"> Field 3<br>
  <!-- 其他字段 -->
  <input type="submit" value="Save">
</form>

from flask import Flask, request
import csv

app = Flask(__name__)

@app.route('/save_data', methods=['POST'])
def save_data():
    selected_fields = request.form.getlist('field')  # 获取选中的复选框的值
    with open('data.csv', 'w', newline='') as csvfile:
        writer = csv.writer(csvfile)
        writer.writerow(selected_fields)  # 将选中的字段写入CSV文件的一行
    return 'Data saved successfully'

if __name__ == '__main__':
    app.run()