查找距假期的天数

Question

所以这是我第一次用 Python 编写代码，我想做一个小项目。我考虑了我想做什么，并认为人们可能想知道每个假期还有多少天。

我应该如何找出今天的日期和假期之间的差异？

from datetime import datetime, timedelta
now = datetime.now() + timedelta(days = 10)

def get_user_holiday():
    holiday = input("What is your favorite holiday? ")

    if holiday == "New Year's Day":
        new_years_Day = datetime(now.year, 1, 1)
    elif holiday == "Martin Luther King Jr. Day":
        martin_luther_king_jr_Day = datetime(now.year, 1, 21)
    elif holiday == "Groundhog Day":
        groundhog_Day = datetime(now.year, 2, 2)
    elif holiday == "Valentine's Day":
        valentines_Day = datetime(now.year, 2, 14)
    elif holiday == "Ash Wednesday":
        ash_Wednesday = datetime(now.year, 3, 6)
    elif holiday == "St. Patrick's Day":
        st_patricks_Day = datetime(now.year, 3, 17)
    elif holiday == "April Fool's Day":
        april_fools_Day = datetime(now.year, 4, 1)
    elif holiday == "Palm Sunday":
        palm_Sunday = datetime(now.year, 4, 14)
    elif holiday == "Good Friday":
        good_Friday = datetime(now.year, 4, 19)
    elif holiday == "Easter Day":
        easter_Day = datetime(now.year, 4, 21)
    elif holiday == "Mother's Day":
        mothers_Day = datetime(now.year, 5, 12)
    elif holiday == "Memorial Day":
        memorial_Day = datetime(now.year, 5, 27)
    elif holiday == "Father's Day":
        fathers_Day = datetime(now.year, 6, 16)
    elif holiday == "Independence Day":
        independence_Day = datetime(now.year, 7, 4)
    elif holiday == "Labor Day":
        labor_Day = datetime(now.year, 9, 2)
    elif holiday == "Columbus Day":
        columbus_Day = datetime(now.year, 10, 4)
    elif holiday == "Halloween Day":
        halloween_Day = datetime(now.year, 10, 31)
    elif holiday == "Veterans Day":
        veterans_Day = datetime(now.year, 11, 11)
    elif holiday == "Thanksgiving Day":
        thanksgiving_Day = datetime(now.year, 11, 28)
    elif holiday == "Hanukkah Day":
        hanukkah_Day = datetime(now.year, 12, 22)
    elif holiday == "Christmas Day":
        christmas_Day = datetime(now.year, 12, 25)
    elif holiday == "New Year's Eve Day":
        new_years_eve_Day = datetime(now.year, 12, 31)
    else:
        print("Not a valid holiday. ")
    return holiday

这就是我将代码编辑成的内容。

from datetime import datetime, timedelta
now = datetime.now()

def get_user_holiday():
    global now
    holiday = input("What is your favorite holiday? ")

    if holiday == "New Year's Day":
        return datetime(now.year, 1, 1)
    elif holiday == "Martin Luther King Jr. Day":
        return datetime(now.year, 1, 21)
    elif holiday == "Groundhog Day":
        return datetime(now.year, 2, 2)
    elif holiday == "Valentine's Day":
        return datetime(now.year, 2, 14)
    elif holiday == "Ash Wednesday":
        return datetime(now.year, 3, 6)
    elif holiday == "St. Patrick's Day":
        return datetime(now.year, 3, 17)
    elif holiday == "April Fool's Day":
        return datetime(now.year, 4, 1)
    elif holiday == "Palm Sunday":
        return datetime(now.year, 4, 14)
    elif holiday == "Good Friday":
        return datetime(now.year, 4, 19)
    elif holiday == "Easter Day":
        return datetime(now.year, 4, 21)
    elif holiday == "Mother's Day":
        return datetime(now.year, 5, 12)
    elif holiday == "Memorial Day":
        return datetime(now.year, 5, 27)
    elif holiday == "Father's Day":
        return datetime(now.year, 6, 16)
    elif holiday == "Independence Day":
        return datetime(now.year, 7, 4)
    elif holiday == "Labor Day":
        return datetime(now.year, 9, 2)
    elif holiday == "Columbus Day":
        return datetime(now.year, 10, 4)
    elif holiday == "Halloween Day":
        return datetime(now.year, 10, 31)
    elif holiday == "Veterans Day":
        return datetime(now.year, 11, 11)
    elif holiday == "Thanksgiving Day":
        return datetime(now.year, 11, 28)
    elif holiday == "Hanukkah Day":
        return datetime(now.year, 12, 22)
    elif holiday == "Christmas Day":
        return datetime(now.year, 12, 25)
    elif holiday == "New Year's Eve Day":
        return datetime(now.year, 12, 31)
    else:
        print("Not a valid holiday. ")
    return holiday

def calculate_dates(holiday, now):
    diff = holiday - now
    if diff.days >= 0:  # holiday is upcoming this year
        return diff.days
    else:  # next holiday occurs next year
        return ((holiday + timedelta(years = 1)) - now).days

hd = get_user_holiday()
now = datetime.now()
calc = calculate_dates(hd, now)

print(calc)

Answer 1

首先，您需要返回假期的日期时间对象，例如

now = datetime.now()

def get_user_holiday():
    global now 
    holiday = input("What is your favorite holiday? ")

    if holiday == "New Year's Day":
        return datetime(now.year, 1, 1)

然后，我不确定计算函数中正在执行的数学运算，因为您总是在当前年份加一，这意味着您正在跳过当前年份尚未发生的假期，除非这就是 max() 调用的目的

但我会试试这个

def calculate_dates(holiday, now): 
    diff = holiday - now 
    if diff.days >= 0:  # holiday is upcoming this year 
        return diff.days
    else:  # next holiday occurs next year .timedelta doesn't support years, so this is my workaround 
        return ((holiday + timedelta(days = 365)) - now).days

但是，请记住，某些假期的日期每年都不同，所以这个结果不会真正准确