python 从 MySQL 中取到 time 类型字段的值变成 timedelta 类型了，如何转换为时间格式？

来个例子

!/usr/bin/env python -- coding:utf-8 --

from datetime import datetime,timedelta

now = datetime.now()

yestoday = now - timedelta(days=1)
tommorow = now + timedelta(days=1)

next_year = now + timedelta(days = 365)