Question

我在我的一个大学课程中学习Python，并且我被要求创建一个“贷款计算器”....我可能有一个想法，但我不知道如何修复我得到的错误TypeError: 'float' object is not subscriptable

这是公告用户必须输入贷款成本，利率和贷款年数。使用以下公式计算每月付款：

M = L[i(1+i)^n]/[(1+i)^(n)-1]
Data:
M = monthly payment
L = loan amount
i = interest rate (remember that 5%, i = 0.05)
n = number of payments

这是我的代码：

# Loan Calculator
# Equation: M = L[i(1+i)^n]/[(1+i)(n)-1]          

print("Loan Calculator")
L = float(input("Loan amount: "))
i = float(input("Interest rate: "))
# Remember: 5% ---> i=0.05
n = float(input("Number of payments: "))
M = (L[i*(1+i)**n]/[(1+i)**(n)-1])
# M = Monthly payment

print("Monthly payment: " + M)

PS：我首先想到的是我错过了将“M”转换为字符串，但在我改为

之后

print("Monthly payment: " + str(M))

我仍然遇到同样的错误......请帮助！

Answer 1

需要做一些改变：

  rescue_from ActionController::UnpermittedParameters do |e|
    render json: {error: e.message, params: e.params}, status: :unprocessable_entity
  end

使用一些任意值：

# Loan Calculator
# Equation: M = L[i(1+i)^n]/[(1+i)(n)-1]          

print("Loan Calculator")
L = float(input("Loan amount: "))
i = float(input("Interest rate: "))
# Remember: 5% ---> i=0.05
n = float(input("Number of payments: "))
M = L*(i*(1+i)**n)/((1+i)**(n)-1)
# M = Monthly payment

print("Monthly payment: " , M)

我在Spyder贷款计算器上缺少什么？

1 个答案: