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我怎么写

   >>> x = int(raw_input("Please enter an integer: "))
    >>> if x < 0:
    ...      x = 0
    ...      print 'Negative changed to zero'
    ... elif x == 0:
    ...      print 'Zero'
    ... elif x == 1:
    ...      print 'Single'
    ... else:
    ...      print 'More'
    ...

在IDLE.一旦我写完第一行后按Enter键,它就会执行第一行,我无法编写完整的代码.我是python的新手,今天就开始了.任何帮助将不胜感激.