Read the full text to tell you how Python outputs the specified format as expected?

#!/usr/bin/python
# -*- coding: UTF-8 -*-

 import datetime

 
 if __name__ == '__main__': 

    # 输出今日日期，格式为 dd/mm/yyyy。更多选项可以查看 strftime() 方法
    print(datetime.date.today().strftime('%d/%m/%Y'))
 
    # 创建日期对象
    miyazakiBirthDate = datetime.date(1941, 1, 5)
 
    print(miyazakiBirthDate.strftime('%d/%m/%Y'))
 
    # 日期算术运算
    miyazakiBirthNextDay = miyazakiBirthDate + datetime.timedelta(days=1)
 
    print(miyazakiBirthNextDay.strftime('%d/%m/%Y'))
 
    # 日期替换
    miyazakiFirstBirthday = miyazakiBirthDate.replace(year=miyazakiBirthDate.year + 1)
 
    print(miyazakiFirstBirthday.strftime('%d/%m/%Y'))

21/10/2015
05/01/1941
06/01/1941
05/01/1942