2.5 怎样解决问题

定义简化版 nextDay

def nextDay(year,month,day):
    """Warning:this version incorrectly assumes all months have 30 days!"""
    if day<30:
        return year,month,day+1
    else:
        if month < 1:
           return year,month + 1, 1
           else:
                return year + 1, 1, 1