python中错误和异常处理的示例分析(python,开发技术)

importException#except在捕获错误异常的时候是要根据具体的错误类型来捕获的#用一个块可以捕获多个不同类型的异常#EXception可以捕获所有异常当对出现的问题或者错误不确定的情况下可以使用此种print(dir(Exception))try:#print(b)#捕获逻辑的代码li=[1,2,3,4]print(li[10])passexceptNameErrorasmsg:#捕获到的错误才会在这里执行print(msg)passexceptIndexErrorasmsg:print(msg)print('初次接触异常')print('HAHAHAHAHHAHAHAH')

try:#print(b)#捕获逻辑的代码#li=[1,2,3,4]#print(li[10])a=10/0passexceptNameErrorasmsg:#捕获到的错误才会在这里执行print(msg)passexceptIndexErrorasmsg:print(msg)passexceptZeroDivisionErrorasmsg:print(msg)print('初次接触异常')print('HAHAHAHAHHAHAHAH')

异常类型

try:print(b)#捕获逻辑的代码#li=[1,2,3,4]#print(li[10])#a=10/0pass#exceptNameErrorasmsg:##捕获到的错误才会在这里执行#print(msg)#pass#exceptIndexErrorasmsg:#print(msg)#pass#exceptZeroDivisionErrorasmsg:#print(msg)#passexceptExceptionasmsg:print(msg)passprint('初次接触异常')print('HAHAHAHAHHAHAHAH')

defA(s):return10/int(s)passdefB(s):returnA(s)*2defmain():try:B('0')passexceptExceptionasmsg:print(msg)passpassmain()#不需要在每个可能出错的地方去捕获,只要在合适的层次去捕获错误就可以了这样的话就大大减少我们写try----exception的麻烦#异常的抛出机制#如果在运行时发生异常解释器会查找相应的异常捕获类型#如果在当前函数里面没有找到的话它会将异常传递给上层的调用函数#如果在最外层没有找到的话解释器就会退出程序down掉

classToolongmyException(Exception):#自定义异常def__init__(self,leng):''':paramleng:长度'''self.len=lengpassdef__str__(self):return'您输入的数据长度是'+str(self.len)+'已经超过长度了'passdefname_Test():name=input('请输入姓名：')iflen(name)>5:raiseToolongmyException(len(name))#抛出异常else:print(name)passpassname_Test()

classToolongmyException(Exception):#自定义异常def__init__(self,leng):''':paramleng:长度'''self.len=lengpassdef__str__(self):return'您输入的数据长度是'+str(self.len)+'已经超过长度了'passdefname_Test():name=input('请输入姓名：')try:iflen(name)>5:raiseToolongmyException(len(name))#抛出异常else:print(name)passexceptToolongmyExceptionasresult:print(result)passfinally:print('执行完毕了')passname_Test()