python-3.x – TypeError：无法将’int’对象转换为str隐式错误p

参见英文答案 > TypeError: Can’t convert ‘int’ object to str implicitly2个
我读了其他问题,但我想做的事情是不同的
我试图在python中制作一个计算器,并尝试将变量输入事物变成一个整数,这样我就可以添加它.这是我的代码还没有完成,我是一个初学者：

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)

它能做什么：

Hello! Whats your name?
Jason
What do you want me to do? Jason
I can add,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 ：)

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

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

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