如何连接'str'和'int'对象？

Question

age = raw_input ('How old are you? ')
print "In two year's time you will be: " , age + 2

如何让代码的最后一行正常工作？在Python中运行时，我得到了错误TypeError: cannot concatenate 'str' and 'int' objects。你知道吗

Answer 1

使用将int强制为str并使用str.format将其添加到字符串中：

age = int(raw_input ('How old are you? ')) 
print "In two year's time you will be: {}".format(age + 2)

Answer 2

age = int(raw_input ('How old are you? '))
print "In two year's time you will be: " , age + 2

Answer 3

我们可以通过将age类型转换为int，然后将其添加到int来连接它

 age = raw_input ('How old are you? ')
 print "In two year's time you will be: " , int(age) + 2

实际上，更好的打印方法是使用格式：

print "In two year's time you will be: {}".format(int(age) + 2)