python error

1. IndentationError: expected an indented block

------缩进问题

>>> for i in ['1','2','3','4']:
... t = s + i
  File "<stdin>", line 2
    t = s + i
    ^
IndentationError: expected an indented block

 

修改后

>>> for i in ['1','2','3','4']:
...     t = s + i
...     print t
...
string1
string2
string3
string4