Python csv导出包含二进制标志(如何删除？)

import csv
import base64

with open('input.csv', 'r') as file:
    reader = csv.reader(file)
    rows = list(reader)

for row in rows:
    for i in range(len(row)):
        try:
            base64.b64decode(row[i])
            row[i] = ''  # 删除包含二进制标志的列
        except base64.binascii.Error:
            pass

with open('output.csv', 'w', newline='') as file:
    writer = csv.writer(file)
    writer.writerows(rows)