TypeError：无法将'int'对象隐式转换为str错误python [重复]

Question

我读过其他问题，但我想做的事情不同 我试图在 python 中制作一个计算器，并试图将变量输入变成一个整数，以便我可以添加它。这是我的代码，还没有完成，我是初学者：

print("Hello! Whats your name?")
myName = input()
print("What do you want me to do? " + myName)
print("I can add, subtract, multiply and divide.")
option = input('I want you to ')
if option == 'add':
    print('Enter a number.')
    firstNumber = input()
    firstNumber = int(firstNumber)

    print('Enter another number.')
    secondNumber = input()
    secondNumber = int(secondNumber)

    answer = firstNumber + secondNumber

    print('The answer is ' + answer)

它的作用：

Hello! Whats your name?
Jason
What do you want me to do? Jason
I can add, subtract, multiply and divide.
I want you to add
Enter a number.
1
Enter another number.
1
Traceback (most recent call last):
File "C:/Python33/calculator.py", line 17, in <module>
print('The answer is ' + answer)
TypeError: Can't convert 'int' object to str implicitly 

任何帮助将不胜感激:)

Answer 1

正如错误消息所说，您不能将 int 对象添加到 str 对象。

>>> 'str' + 2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: Can't convert 'int' object to str implicitly

将int对象显式转换为str对象，然后拼接：

>>> 'str' + str(2)
'str2'

或者使用str.format方法：

>>> 'The answer is {}'.format(3)
'The answer is 3'