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'
...
这在空闲。写完第一行后我一按回车,它就会执行第一行,我无法编写完整的代码。我对python很陌生,今天才开始。任何帮助将不胜感激。