在Python 3中使用多个输入变量

Question

所以我对编码很新，我正在学习python，所以我决定尝试制作一个贷款计算器。我做到了这一点，当用户输入他们的原则，利率和完全支付贷款所需的年数时，它将输出他们的年度付款，他们的每月付款和他们的贷款总额。我做了这个，它工作。我决定更进一步，以便在此之后，如果用户输入他们的年收入，它会将他们的月收入与他们的月付款进行比较，并告诉他们是否需要再融资。

这是我制作的节目：

principle = float(input("Principle: ")) #principle = the amount of dollars borrowed
rate = float(input("Rate: ")) #rate = the interest rate that is charged each year on unpaid principle
years = float(input("Years: ")) #years = the number of years required to repay the loan in full

payment = ((1 + rate)**years * principle * rate)/((1 + rate)**years - 1)

#lines 7-10 print the annual, monthly, and total payments made respectively
print("Annual payment: ${:,.2f}".format(payment))
print("Monthly payment: ${:,.2f}".format(payment/12))
print("Total paid for the life of the loan: ${:,.2f}".format(payment*years))

principle = float(input("Principle: ")) #principle = the amount of dollars borrowed
rate = float(input("Rate: ")) #rate = the interest rate that is charged each year on unpaid principle
years = float(input("Years: ")) #years = the number of years required to repay the loan in full

payment = ((1 + rate)**years * principle * rate)/((1 + rate)**years - 1)

annualinc = float(input("Annual income: ")) #annualinc = the annual income

#to check if the user needs to refinance or not by comparing their monthly 
income to their monthly payment
if (annualinc / 12) <= (payment / 12) and rate > .05:
    print("You should refinance")
elif (annualinc / 12) <= (payment / 12):
    print("You should seek financial counseling")
else:
    print("If you make all your payments, your loan will be paid on time.")

我能使if语句工作的唯一方法是让用户在print语句和if语句之间重新输入每个变量。每当我在打印语句之前或打印语句和if语句之间将变量annualinc = float(input("Annual income: ")放在程序的开头时，它就会在语法错误之后打破它之后的行。为什么我必须再次询问所有变量，为什么我不能单独询问变量annualinc？当我把它与第一组变量放在一起时，为什么它不起作用？

编辑：我修复它，所以我不必再次输入所有变量！我在线的末尾错过了一个括号，当我移动它时，我已经复制并粘贴线，因此误差随之移动。对不起这样的菜鸟错误，谢谢！

Answer 1

这适合你吗？

principle = float(input("Principle: ")) #principle = the amount of dollars borrowed
rate = float(input("Rate: ")) #rate = the interest rate that is charged each year on unpaid principle
years = float(input("Years: ")) #years = the number of years required to repay the loan in full

payment = ((1 + rate)**years * principle * rate)/((1 + rate)**years - 1)

#lines 7-10 print the annual, monthly, and total payments made respectively
print("Annual payment: ${:,.2f}".format(payment))
print("Monthly payment: ${:,.2f}".format(payment/12))
print("Total paid for the life of the loan: ${:,.2f}".format(payment*years))

annualinc = float(input("Annual income: ")) #annualinc = the annual income

#to check if the user needs to refinance or not by comparing their monthly income to their monthly payment
if (annualinc / 12) <= (payment / 12) and rate > .05:
    print("You should refinance")
elif (annualinc / 12) <= (payment / 12):
    print("You should seek financial counseling")
else:
    print("If you make all your payments, your loan will be paid on time.")

我刚刚删除了冗余部件，它可以在我的机器上运行！