多次写入csv文件？

Question

是否有一种“ a”模式，例如为csv多次写入txt.-file？每当执行时，我的代码总是会覆盖csv。

import csv

row = ['2', 'Marie', 'California']



with open('test_CSV.csv', 'w') as writeFile: #File darf nicht offen in excel sein, sonst keine permission
    writer = csv.writer(writeFile)
    writer.writerow(row)

#readFile.close()
writeFile.close()