Python：將小數轉換爲月份

下面的函數返回：您的月付款爲6.25年529.22美元，首付4620.06美元。Python：將小數轉換爲月份

如何將小數轉換爲4個月而不是.25年。

我希望輸出結果如下：您的月付款爲6年零4個月529.22美元，首付4620.06美元。

def newcar(): 

input("How much is a new car going to cost you per month? Please hit 
enter to start") 
p = int(input("Please enter total cost of car: ")) 
r = float(input("Please enter interest rate as a whole number(example: 
15.6% = 15.6): National average is around 10.5%): ")) 
t = int(input("These payments would last for how many months?: ")) 
dp = int(input("Please enter the downpayment percentage as a whole 
number: example: 20% = 20: ")) 
afterdp = p - (p * dp/100) 
downpay = p - afterdp 
downpay = round(downpay, 2) 
interest = afterdp * (r/100) * (t/12) 
interest = round(interest, 2) 
monthly_payment_bt = (afterdp + interest)/t 
monthly_payment_bt = round(monthly_payment_bt, 2) 
monthly_payment = (monthly_payment_bt * .07) + monthly_payment_bt 
monthly_payment = round(monthly_payment, 2) 
t = round(t/12, 2) 
return("Your monthly payment would be $" + str(monthly_payment) + " 
for " + str(t) + " years, and a downpayment of $" + str(downpay)) 

print(newcar())

來源

2017-04-11 Andrew Lastrapes

只要做'.25 * 12'和'round（）'it ...順便說一句，1年的25％等於3個月，而不是4個。 –

我很確定你沒有計算利息正確。通常情況下，每月的利息都是複利的，所以您不會爲已經支付的部分支付利息（但您確實支付過往利息）。我建議使用[這個公式]（https://en.wikipedia.org/wiki/Mortgage_calculator#Monthly_payment_formula），並用整數個月（而不是分數）來計算。 – Blckknght

你可以在年內轉換爲整數，並轉換小數部分* 12月：

def singular_or_plural(count, word): 
    if count == 1: 
     return "1 %s" % word 
    elif count > 1: 
     return "%d %ss" % (count, word) 


def years_and_months(float_year): 
    year = int(float_year) 
    month = int((float_year % 1) * 12) 
    words = [(year, 'year'), (month, 'month')] 
    return ' and '.join(singular_or_plural(count, word) 
         for (count, word) in words if count > 0) 

print(years_and_months(0.09)) 
print(years_and_months(0.50)) 
print(years_and_months(1)) 
print(years_and_months(2)) 
print(years_and_months(2.5)) 
print(years_and_months(2.99)) 
print(years_and_months(6.25))

它輸出：

1 month 
6 months 
1 year 
2 years 
2 years and 6 months 
2 years and 11 months 
6 years and 3 months

之前調用此fonction，你可以檢查持續時間是否至少一個月。

來源

2017-04-11 16:21:13

Python：將小數轉換爲月份

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