请问为啥我的Python不能循环

Python 3.6.2 (v3.6.2:5fd33b5, Jul  8 2017, 04:14:34) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> message=['1','2']
>>> for s in message:
... print(s)
  File "<stdin>", line 2
    print(s)
        ^
IndentationError: expected an indented block
>>>