Python 自定义异常与抛出异常

自定义异常与抛出异常

自定义抛出异常raise

• 将信息以报错的形式抛出

用法

• rais 异常类型（message)

参数

• message：错误信息

返回值

• 无返回值

自定义异常类

• 继承基类——Exception
• 在构造函数中定义错误信息

代码

	# coding:utf-8
	def test(number):
	if number == 100:
	raise ValueError('number 不可以是100')
	return number
	# result = test(100)
	# print(result)
	def test2(number):
	try:
	return test(number)
	except ValueError as e:
	return e
	result = test2(100)
	print(result)
	def test3():
	raise '错误了'
	# test3()
	def test4(name):
	if name == 'dewei':
	raise Exception('dewei不可以被填写')
	return name
	# test4('dewei')
	class NumberLimitError(Exception):
	def __init__(self, message):
	self.message = message
	class NameLimitError(Exception):
	def __init__(self,message):
	self.message = message
	def test5(name):
	if name == 'dewei':
	raise NameLimitError('dewei不可以被填写')
	return name
	def test6(number):
	if number > 100:
	raise NumberLimitError('数字不可以大于100')
	return number
	print('----------')
	try:
	test5('dewei')
	except NameLimitError as e:
	print(e)
	try:
	test6(1000)
	except NumberLimitError as e:
	print(e)
	# test5('dewei')

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