HomeWork2

1.filter 编程闰年

def judge_year(year):
  if (year%4==0 and year%100!=0) or year%400 ==0:
    return True
  else:
    return False

year_list=range(1987,2020)
leap_year=filter(judge_year,year_list)
print leap_year
#列表解析  
[year for year in range(1987,2020) if (year%4==0 and year%100!=0) or year%400 ==0]

2.

mp = {0: "zero", 1: "one", 2: "two", 3: "three", 4: "four", 5: "five", 6: "six", 

        7:"seven", 8:"eight", 9: "nine", 10: "ten", 11: "eleven", 12: "twelve", 
        13: "thirteen", 14: "fourteen", 15: "fifteen", 16: "sixteen", 17: "seventeen",
        18: "eighteen", 19: "nineteen",
        20: "twenty", 30: "thirty", 40: "forty", 50: "fifty", 60: "sixty", 
        70: "seventy", 80: "eighty", 90: "ninety", 100: "hundred", 
        1000: "thousand", 1e6: "million", 1e9: "billion", 1e12: "trillon"};
def TranslateNum(snum):
    snum = snum.lstrip('0');
    if(snum == ""): return "";
    dw = int(snum);
    res = "";
    if(dw <= 19):
        res = mp[dw];
    elif(dw < 100):
        res = mp[dw//10*10];
        a = TranslateNum(snum[-1]);
        if(a != ""): res += '-' + a;
    else:
        bw = len(snum)-1;
        if(bw <= 2): bw = 2;
        elif(bw <= 5): bw = 3;
        elif(bw <= 8): bw = 6;
        elif(bw <= 11): bw = 9;
        elif(bw <= 14): bw = 12;
        else: return "infinity........";
        weight = 10**bw;
        res = TranslateNum(snum[:-bw]) + ' ' + mp[weight];
        a = TranslateNum(snum[-bw:]);
        if(a != ""):
            if(bw == 2): res += " and ";
            else: res += ", ";
            res += a;
    return res;
eres = input(">>> ");
if(int(eres) != 0):
    eres = TranslateNum(eres);
else:
    eres = 0;
print(eres);

3.

def  datedif(date1,date2):
    "利用datetime模块计算两个日期字串之间的天数，格式YYYY-MM-DD"
    if  date1 = = date2:
        return  0
    from  datetime  import  date
    d1 = map ( int ,date1.split( '-' ))
    d2 = map ( int ,date2.split( '-' ))
    d1 = date(d1[ 0 ],d1[ 1 ],d1[ 2 ])
    d2 = date(d2[ 0 ],d2[ 1 ],d2[ 2 ])
    return  (d1 - d2).days
def  dttoday(date1):
    "计算date1到今天的天数,date1格式为YYYY-MM-DD"
    from  datetime  import  date
    date2 =  date.today().isoformat()
    return  datedif(date1,date2)
def  dtb(date1):
    "计算生日为date1的人还有多久过生日,date1格式为YYYY-MM-DD"
    from  datetime  import  date
    today = date.today()
    d1 = map ( int ,date1.split( '-' ))
    d1 = date(today.year,d1[ 1 ],d1[ 2 ])
    if  today>d1:
        d1 = d1.replace(year = d1.year + 1 )
    return  (d1 - today).days