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用户输入内容长度限制的异常

2013-06-24 10:48 357 查看

class ShortInputException(Exception):

'''A user-defined exception class'''

def __init__(self,length,atleast):

Exception.__init__(self)

self.length=length

self.atleast=atleast

try:

s=raw_input('Enter something-->')

if len(s)<3:

raise ShortInputException(len(s),3)

except KeyboardInterrupt: #当用户取消输入时，引发此异常

print "Cancel it "

except EOFError:

print '\n Why did you do an EOF on me?'

except ShortInputException,x:

'''如果引发该异常ShortInputException实例赋给后面那个名字x;当用户输入内容长度<3时，引发此异常；建议此处使用[b]except ShortInputException as x:如果引发该异常ShortInputException实例赋给后面那个名字x[/b]

[b]'''

[/b]

print 'ShortInputException:The input was of length %d,\

was expecting at least %d' %(x.length,x.atleast)

else:

print 'No exception was raised'

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