Question

以下是我到目前为止的代码以及我得到的错误。我试过玩，但显然我不明白循环应该如何工作

我试图循环，以便输入错误的输入，即字母和1000英镑以下的错误并重新输入问题。我有大部分工作，但它循环到初始问题而不是字母输入的错误问题，但给出错误信息然后继续使用数字但低于1000英镑。

print ("Welcome to Trustees Investment Bank Compoud Interest Calculator") #Title
print ("Interest is calculated at 3.15% per annum")

while True:
    try:
        deposit2 = float(input("\nEnter initial deposit above £1000? ")) # Initial deposit amount
        rate = 0.0315 # interest rate
        if deposit2<1000:
            deposit2 = float(input("\nEnter initial deposit above £1000? ")) #loop   
    except ValueError:
        continue
    else:
        break

for year in range(1,9):
    amount = deposit2 * (1.0 + rate) ** year
    print ("%4d%21.2f" % (year, amount))

这是我的输出

Welcome to Trustees Investment Bank Compound Interest Calculator
Interest is calculated at 3.15% per annum 
Enter initial deposit above £1000? jj 
Enter initial deposit above £1000? hgh 
Enter initial deposit above £1000? 500 
Not valid amount, 
please enter deposit above £1000 500 
1 515.75
2 532.00
3 548.75
4 566.04
5 583.87
6 602.26
7 621.23 
8 640.80

Answer 1

您处于暂停状态，因此您不需要两次请求用户输入。如果不满足条件，则会发生另一次迭代，无论如何都会要求您输入另一个输入。此外，您的else位置错误。

print ("Welcome to Trustees Investment Bank Compoud Interest Calculator")
print ("Interest is calculated at 3.15% per annum")

while True:
    try:
        deposit2 = float(input("\nEnter initial deposit above £1000? "))
        rate = 0.0315
        if deposit2<1000:
            print ("Not a valid amount, please try again.")
        else:
            break

    except ValueError:
        print ("You have not entered a number. Please enter a valid number")

for year in range(1,9):
    amount = deposit2 * (1.0 + rate) ** year
    print ("%4d%21.2f" % (year, amount))

这有输出：

Welcome to Trustees Investment Bank Compoud Interest Calculator
Interest is calculated at 3.15% per annum

Enter initial deposit above £1000? 50
Not a valid amount, please try again.

Enter initial deposit above £1000? abcdefg
You have not entered a number. Please enter a valid number

Enter initial deposit above £1000? 1500
   1              1547.25
   2              1595.99
   3              1646.26
   4              1698.12
   5              1751.61
   6              1806.79
   7              1863.70
   8              1922.41

复利计算器循环

1 个答案: