为什么我会收到 +: float 和 str 不支持的错误？

Question

我对编程很陌生，遇到了一个问题。

Traceback (most recent call last):
  File "C:/Users/aecas/AppData/Local/Programs/Python/Python38-32/Project.py", line 24, in <module>
    finalpay = usercommission + userpay
TypeError: unsupported operand type(s) for +: 'float' and 'str'

我写的程序是：

#Prompt user for name
username = input("What is your employee name?")

#Prompt user to enter number of hours worked
userhours = input("Please enter number of hours worked this week: ")


#Prompt user for weekly sales
usersales = input("Enter weekly sales amount:")

commission = float(usersales)

#calculate the commission (.2*user sales input)
usercommission = (20/100) * commission

#hourly rate which I establish
rate = 15

#User pay before commmission
userpay=  (rate * userhours)

#Compute total pay for user
finalpay = usercommission + userpay

print(name, "Your total pay is: ",finalpay)

Answer 1

您需要将userhours 转换为整数。 userhours = int(userhours)也是如此。

Answer 2

很容易理解你的问题，它说“TypeError: unsupported operand type(s) for +: 'float' and 'str'”，这意味着你的第一个值是'float'，你的第二个是'string'

查看代码时，将第一个输入转换为浮点数，而不是 userhours。当您将字符串与如下数字相乘时：userpay= (rate * userhours)。您的字符串userhours 将在userpay 出现重复字符串。因此，首先转换userhours。然后就可以添加了。

Answer 3

input 正在返回一个字符串，而不是一个浮点数。 usersales 被转换为 float()，但 userhours 永远不会被转换。

另外，在最后一行，name 将是未定义的，认为它需要是username

试试这个：

#!/usr/bin/python3
#Prompt user for name
username = input("What is your employee name?")

#Prompt user to enter number of hours worked
userhours = float(input("Please enter number of hours worked this week: "))


#Prompt user for weekly sales
usersales = input("Enter weekly sales amount:")

commission = float(usersales)

#calculate the commission (.2*user sales input)
usercommission = (20/100) * commission

#hourly rate which I establish
rate = 15

#User pay before commmission
userpay=  (rate * userhours)

#Compute total pay for user
finalpay = usercommission + userpay


print(username, "Your total pay is: ",finalpay)