Python是如何计算这个公式的？
Python是如何计算这个公式的？
提问于 2018-09-20 05:20:14
我正在解决这个问题，我知道它是正确的，但我不确定这个公式是如何工作的。
balance: int = 484
monthlyPayRate: float = 0.04
annualInterestRate: float = .2
for i in range(12):
balance = balance - (balance * monthlyPaymentRate) +\
((balance - (balance * monthlyPaymentRate)) * \
(annualInterestRate/12))
print("Remaining balance:", round(balance,2))我只是试着通过范围(1)，我知道正确的答案是472.38。
我是这样计算的: 484 - (484 * 0.04) = $464.64 (这是付款后的余额，利息前的余额) 464 * (.2/12) =$7.42(我们的剩余余额为464.64 x利率为0.016) 464 .64 + 7.424 = $472 (我们在剩余余额上加上利息得到了新的余额)
当我尝试将数字插入python公式并手动执行时，我无法理解Python是如何让它工作的。我希望有人能给我展示一下Python使用这个公式所采取的步骤？
回答 2
Stack Overflow用户
发布于 2018-09-20 05:38:36
我可以想象它是这样做的：
balance = 484 - (484 * 0.04) + ((484- (484 *0.04)) * (0.2/12))这基本上就是它在那里写的内容，结果是472.38。
然后用472.38替换变量balance e，重复计算12次，总是用新的结果替换变量，最后返回361.61。
这些计算对我来说，无论是在软件中还是在手工中都是有效的。
Stack Overflow用户
发布于 2018-09-20 07:19:08
为了清楚起见：
balance = 484
monthlyPaymentRate = 0.04
annualInterestRate = .2
for i in range(12):
paidoff = balance * monthlyPaymentRate
newinterest = (balance - paidoff) * annualInterestRate/12
balance = balance - paidoff + newinterest
print("Balance after", i+1, "months", round(balance,2));
print("Remaining balance:", round(balance,2))提供：
Balance after 1 months 472.38
Balance after 2 months 461.05
Balance after 3 months 449.98
Balance after 4 months 439.18
Balance after 5 months 428.64
Balance after 6 months 418.35
Balance after 7 months 408.31
Balance after 8 months 398.51
Balance after 9 months 388.95
Balance after 10 months 379.62
Balance after 11 months 370.5
Balance after 12 months 361.61
Remaining balance: 361.61拆分计算允许这样的事情：
>>> balance = 484
>>> totalpaid=0
>>> totalinterest=0
>>> monthlyPaymentRate = 0.04
>>> annualInterestRate = .2
>>> for i in range(12):
... paidoff = balance * monthlyPaymentRate
... newinterest = (balance - paidoff) * annualInterestRate/12
... balance = balance - paidoff + newinterest
... totalpaid = totalpaid + paidoff
... totalinterest = totalinterest + newinterest
...
>>> print("Remaining balance:", round(balance,2))
Remaining balance: 361.61
>>> print("Total amount paid off:", round(totalpaid,2))
Total amount paid off: 203.98
>>> print("Total interest accrued:", round(totalinterest,2))
Total interest accrued: 81.59页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/52414353
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