用户输入内容长度限制的异常 分类： python异常 2013-06-24 10:48 335人阅读 评论(0) 收藏
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?'
was expecting at least %d' %(x.length,x.atleast)
else:
print 'No exception was raised'
'''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except ShortInputException as x:如果引发该异常ShortInputException实例赋给后面那个名字x
'''
was expecting at least %d' %(x.length,x.atleast)
else:
print 'No exception was raised'
