字符串格式多个循环列表理解，而多个文件 s3 读取 csv

如何解决字符串格式多个循环列表理解，而多个文件 s3 读取 csv

key = 'transformed/ACTION_CLICK/yyyy=202{0}/mm=0{1}/dd=0{2}/2021_0{1}_0{2}_ACTION-CLICK.csv'

a = [key.format(y,m,d) for d in range(1,8) for m in range(1,3)  for y in range(0,2)]

print(a)

getting below output
['transformed/ACTION_CLICK/yyyy=2020/mm=01/dd=01/2021_01_01_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=01/dd=01/2021_01_01_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=02/dd=01/2021_02_01_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=01/2021_02_01_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=01/dd=02/2021_01_02_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=01/dd=02/2021_01_02_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=02/dd=02/2021_02_02_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=02/2021_02_02_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=01/dd=03/2021_01_03_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=01/dd=03/2021_01_03_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=02/dd=03/2021_02_03_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=03/2021_02_03_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=01/dd=04/2021_01_04_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=01/dd=04/2021_01_04_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=02/dd=04/2021_02_04_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=04/2021_02_04_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=01/dd=05/2021_01_05_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=01/dd=05/2021_01_05_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=02/dd=05/2021_02_05_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=05/2021_02_05_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=01/dd=06/2021_01_06_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=01/dd=06/2021_01_06_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=02/dd=06/2021_02_06_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=06/2021_02_06_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=01/dd=07/2021_01_07_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=01/dd=07/2021_01_07_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2020/mm=02/dd=07/2021_02_07_ACTION-CLICK.csv','transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=07/2021_02_07_ACTION-CLICK.csv']

Need This output:

transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=01/2021_02_01_ACTION-CLICK.csv
transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=02/2021_02_02_ACTION-CLICK.csv
transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=03/2021_02_03_ACTION-CLICK.csv
transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=04/2021_02_04_ACTION-CLICK.csv
transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=05/2021_02_05_ACTION-CLICK.csv
transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=06/2021_02_06_ACTION-CLICK.csv
transformed/ACTION_CLICK/yyyy=2021/mm=02/dd=07/2021_02_07_ACTION-CLICK.csv

请建议我最好的方法来实现这一点我使用 s3 存储桶密钥文件结构来读取 csv 文件