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

How do I get the last line of this code to work? I get the error TypeError: cannot concatenate 'str' and 'int' objects when I run it in Python.

Answer 1

Use coerce the int to a str and use str.format to add it to your string:

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

Answer 2

We can concatenate it by typecasting age to int and then adding it to an int.

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

Infact a better way to print this would be to use format:

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

Answer 3

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

Answer 4

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

That should work if you are using Python 2.7, not sure if it will work on 3.x