如何在每次循环后将输出保存在.csv中，而不在Pandas中覆盖？

import csv

with open('output.csv', 'w', newline='') as csvfile:
    writer = csv.writer(csvfile)
    writer.writerow(['Column1', 'Column2', 'Column3'])  # 根据实际情况添加表头内容

with open('output.csv', 'a', newline='') as csvfile:
    writer = csv.writer(csvfile)
    writer.writerow([data1, data2, data3])  # 根据实际情况添加数据内容