final = P *（（（1 +（r / n））**（n * t）））TypeError：/：'str'和'int'的不支持的操作数类型 [英] final = P * (((1 + (r/n)) ** (n*t))) TypeError: unsupported operand type(s) for /: 'str' and 'int'
问题描述
我是Python的新手（运行Python 3），搜索过每一个地方并且仍然坚持这一点。
我明白我有一个字符串，但需要把它变成一个整数作为最终答案。下面是我输入的代码来测试它。我坚持我得到的错误。
这是一个复利计算器，用户必须输入本金，年利率，复合频率和年份。
我做了一些研究，并注意到我可以使用（'inf'）p，n和r作为声明说可以是大数字也可以是小数字。基本上用户可以输入任何数字。
I'm new to Python (running Python 3), have searched every where and still stuck on this. I understand that I have a string but need to get it into a integer as a final answer. Below is the code I inputted to test it out. I'm stuck on the error that I get. This is for a compound interest calculator where the user has to input the principal, annual interest rate, how often it's compounded, and the year(s). I did some research and noticed that i can use ('inf') for p,n,and r as a statement saying either can be large or small numbers. Basically the user can input any number.
P = 10000
n = 12
r = 0.08
p = int(input("Enter starting principle please. "))
n = int(input("Enter Compound intrest rate.(daily, monthly, quarterly, half-year, yearly) "))
r = input("Enter annual interest amount. (decimal) ")
t = int(input("Enter the amount of years. "))
final = P * (((1 + (r/n)) ** (n*t)))
print ("The final amount after", p, "years is", final)
错误：
Enter starting principle please. 75000
Enter Compound intrest rate.(daily, monthly, quarterly, half-year, yearly) 12
Enter annual interest amount. (decimal) 0.03
Enter the amount of years. 15
Traceback (most recent call last):
File "C:\Users\Joshua\AppData\Local\Programs\Python\Python35-32\Program Five.py", line 10, in <module>
final = P * (((1 + (r/n)) ** (n*t)))
TypeError: unsupported operand type(s) for /: 'str' and 'int'
这是我第一次使用本网站，如果我遗漏任何信息，请告诉我。我愿意接受任何有助于我解决此问题的建议。
This is my first time using this site, if I left out any information please let me know. I'm open to any suggestions that will help me fix this issue.
Edit
对不起等待。好吧，我相信我能通过@Rafael Cardoso推荐的Stop and Think让它正常工作。谢谢你。
Sorry for the wait. Okay I believe I got it to work correctly going by @Rafael Cardoso recommendation of Stop and Think. Thank you for that.
P = 10000
n = 12
r = 0.08
p = int(input("Enter starting principle please. "))
n = int(input("Enter Compound intrest rate.(daily, monthly, quarterly, half-year, yearly) "))
r = float(input("Enter annual interest amount. (decimal) "))
t = int(input("Enter the amount of years. "))
final = P * (((1 + (r/n)) ** (n*t)))
print ("The final amount after", p, "years is", final)
当我运行它时，不会弹出任何错误。我在休息之后发现（'inf'）引起了这个问题，如果我离开p，n，r那么它没有问题。
When I run it, no errors pop up. I found out after taking a breather that the ('inf') was causing the issue, if I leave p,n,r with whats there it works with no issues.
再次感谢每一个人！
推荐答案
根据堆栈跟踪， r 是 str 。您应该只使用数字，所以为了执行操作，将r转换为 float （因为它处理十进制数字）
According to the stacktrace, r is a str. You should work with numbers only, so in order to do the operation, convert r to float (as it deals with decimal numbers)
r = float(input("Enter annual interest amount. (decimal) "))
编辑
好的，让我们停下来思考。当您使用 python 3 时，输入函数会将您输入的值存储为字符串（即文本）。你希望他们成为数字。
Edit
Ok, lets stop and think. As you are using python 3 , the input function will store the value you input as a string (i.e. as text). You want them to be numbers.
因此，您必须将所有内容转换为数字，以便您能够乘以，除以等等。例如，a/ b是什么意思？那么a1/b2呢？甚至1/2？他们毫无意义。但是， 1/2 是有道理的。区别在于我们正在处理前3个示例中的文本，并且在最后一个示例中使用数字。
So, you have to convert everything to numbers so that you are able to multiply, divide etc. For example, what does "a"/"b" means? And what about "a1"/"b2"? Or even "1"/"2"? They make no sense. However, 1/2 makes sense. The difference is that we are dealing with text in the first 3 examples, and with numbers in the last example.
要使其工作，您应该将所有内容转换为 int 或 float 。这些类型是数字，您可以毫不费力地使用它们进行数学运算。
To make it work, you should convert everything either to int or to float. These types are numbers, and you can do mathematical operations with them without worries.
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