一个if else的有关问题

一个if else的问题
>>>MyNumber = 4
>>>if(MyNumber % 2 == 0):
...print("MyNumber is even!")

（这时回车的时候出现个：
  File "<stdin>", line 2
  print("MyNumber is even!")
  ^
IndentationError: expected an indented block）



>>>else:
...print("MyNumber is odd!")

这是为什么？

[解决办法]
Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> MyNumber = 4
>>> if MyNumber%2 == 0:
print("MyNumber is even!")
else:
print("MyNumber is odd!")

MyNumber is even!
>>>