#给出一个日期和一个数字，判断日期加上数字之后的新日期def day(date,num):    #date=raw_input("(MM/DD/YY)>>")    date=date.split("/")    year1=int(date[-1])    month1=int(date[0])    day1=int(date[1])    #num=raw_input("enter a number:")    num=int(num)    month_days=[31,28,31,30,31,30,31,31,30,31,30,31]        if int(date[2])%4==0:        month_days[1]=29        years1=366    else:        years1=365    days1=sum(month_days[:(month1-1)])+day1    sumdays=days1+num    if num>=0: #数字为正数或者0        lis=[]        if sumdays<=years1: #本年            year2=year1            print year2            lis.append(year2)            sumday=0            for i,j in enumerate(month_days):                if sumday<sumdays:                    sumday=sumday+int(j)                            month2=i+1            print month2            lis.append(month2)            marginday=sum(month_days[:i+1])-sumdays            day2=month_days[i]-marginday            print day2            lis.append(day2)                         print "%d天后的日期为：%d年%d月%d号"%(num,lis[0],lis[1],lis[2])           else:  #不在本年            lis=[]            remain1=years1-days1            remain2=num-remain1                        year2=year1+1            if year2%4==0:                years2=366                month_days[1]=29               else:                years2=365                            while remain2>years2:                              remain2=remain2-years2                year2=year2+1                if year2%4==0:                    years2=366                    month_days[1]=29                   else:                    years2=365                     month_days[1]=28            lis.append(year2)                                          for i,j in enumerate(month_days):                if remain2<=sum(month_days[:i+1]):                    month2=i+1                    lis.append(month2)                    day2=remain2-sum(month_days[:i])                    lis.append(day2)                    break            print type(lis)            print lis            print "%d天后的日期为：%d年%d月%d号"%(num,lis[0],lis[1],lis[2])    else: #num为负数的时候        lis=[]        remindays=0        years2=years1        year2=year1                if sumdays<=0:            remindays=abs(sumdays)            while remindays>=0:                year2=year2-1                                if year2%4==0:                    remindays=remindays-366                else:                    remindays=remindays-365            lis.append(year2)            print remindays              remindays=abs(remindays)        else:            remindays=sumdays            lis.append(year1)                    print remindays        for i,j in enumerate(month_days):            if remindays<=sum(month_days[:i+1]):                month2=i+1                lis.append(month2)                day2=remindays-sum(month_days[:i])                lis.append(day2)                break                    print "%d天后的日期为：%d年%d月%d号"%(num,lis[0],lis[1],lis[2])           day("12/20/2015",‘0‘)