[Python]Python中实现一个时间（日期）型加几个月的运算

Python的日期时间函数中好像没有把一个日期（时间）型变量加上几个月的函数，仿照Delphi中的自己写了一个。代码如下：

import calendar

Yearmonth = ((0,31,28,31,30,31,30,31,31,30,31,30,31),
             (0,31,29,31,30,31,30,31,31,30,31,30,31))   

def addmonths(begindate, months):
    n = begindate.year*12 + begindate.month - 1
    n = n + months
    ryear = n / 12
    rmonth = n%12 + 1
    rday = begindate.day
    if calendar.isleap(ryear):
        if rday > Yearmonth[1][rmonth]:
            rday = Yearmonth[1][rmonth]
    else:
        if rday > Yearmonth[0][rmonth]:
            rday = Yearmonth[0][rmonth]
       
    return begindate.replace(year=ryear, month=rmonth, day = rday)