python的datetime模块获取两个日期之间的月份数，打印两个日期之间所有的年月

获取两个日期之间的月份数

from datetime import datetime

start_date = datetime.strptime('2021-01', '%Y-%m')
start_year, start_month = start_date.year, start_date.month
end_date = datetime.strptime('2021-09', '%Y-%m')
end_year, end_month = end_date.year, end_date.month
interval=