Нахождение количества дней до праздников

Question

Так что я впервые пишу код на Python, и я хотел сделать небольшой проект. Я подумал о том, что хочу сделать, и подумал, что люди могут захотеть узнать, сколько дней до каждого праздника.

Как мне найти разницу между сегодняшней датой и праздниками?

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

Это то, к чему я отредактировал код.

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

Для начала вам нужно вернуть объекты даты и времени для праздника, например,

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)

. Тогда я не уверен, что математические вычисления выполняются в функции вычисления, потому что вывсегда добавляя один к текущему году, что означает, что вы пропускаете праздники, которых еще не было в текущем году, если только это не вызов max () для

Но я бы попробовал это

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

Однако имейте в виду, что даты определенных праздников меняются каждый год, поэтому этот результат не будет действительно точным