raising.py

《简明 Python 教程》为 "A Byte of Python" 的唯一指定简体中文译本

#!/usr/bin/env python
# Filename: raising.py

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)
	# Other work can continue as usual here
except EOFError:
	print '\nWhy did you do an EOF on me?'
except ShortInputException,x:
	print 'ShortInputException: The input was of length %d, \
was expecting at least %d' %(x.length,x.atleast)
else:
	print 'No exception was raised.'