Python 代码没有打印出想要的结果

Question

我对 Python 非常陌生，作为一种学习方式，我给自己分配了这个问题，但无论我做什么，结果仍然达到 100000，即使该值小于（第一个条件或第二个条件）并且应该打印 200000。请帮忙。

price = 1000000
credit_score = 300
income  = 70000


if credit_score and income:
    credit_score > 700 and income > 80000
    downpayment = price * 0.10
    print(f"Downpayment:  {downpayment}")
elif credit_score or income:
    credit_score < 700 or income < 80000
    downpayment = price * 0.20
    print(f"Downpayment:  {downpayment}")
else: 
    downpayment = price * 0.30
    print(f"Downpayment:  {downpayment}")

Answer 1

您将要测试的条件放在if语句之后，而不是放在它们所属的位置。

if credit_score > 700 and income > 80000:
    downpayment = price * 0.10
    print(f"Downpayment:  {downpayment}")
elif credit_score < 700 or income < 80000:
    downpayment = price * 0.20
    print(f"Downpayment:  {downpayment}")
else: 
    downpayment = price * 0.30
    print(f"Downpayment:  {downpayment}")

Answer 2

代替

if credit_score and income:
    credit_score > 700 and income > 80000

做

if credit_score > 700 and income > 80000:

将变量直接作为if语句中的子句（即if credit_score ）试图将该变量强制转换为布尔值。 任何非零数字或任何非空字符串注册为真，这意味着您的代码始终采用第一个分支。

相反，您应该做的是检查条件credit_score > 700和条件income > 80000 。

Answer 3

我希望你现在已经清楚它是如何工作的。 我将提供另一种方法：

downpayment = price * 0.10 if (credit_score > 700 and income > 80000) else (price * 0.20 if credit_score < 700 or income < 80000 else price * 0.30) 
print(f"Downpayment:  {downpayment}")