python计算N天之后日期的方法

#! /usr/bin/env python
#coding=utf-8
import time
import datetime
d1 = datetime.datetime.now()
d3 = d1 + datetime.timedelta(days =10)
print str(d3)
print d3.ctime()

输出结果如下：

2015-02-18 16:49:28.362000
Fri Feb 18 16:49:28 2015