Python论坛的帖子：

Wed Feb 23 09:36:54 HKT 2005

我觉得jian wang 说的还是挺有理的。。

>>>> 借鉴其他语言的异常思想,不是这样写捕获语句的.
>>>> 你的捕获机制不完善,导致你漏掉了一些异常.
>>>> 
>>>> 建议你的异常捕获象下面这样分级捕获, 每个异常捕获语句仅捕获自己感兴趣的异常,
>>>> 最后使用Exception捕获所有未拦截的异常.

即使在业务层面也应该这样来处理吧。。。

On 2/22/05 7:47 PM, "jian wang" <wangjian5748 at 163.com> wrote:

> hw_cg,您好！
> 
> 我只是想提醒大家这个关键知识点,主要是针对没有项目经验的学生朋友.包括部分做项目的朋友!并不
> 想那这段代码来说事!!
> 因为不少人会说自己的代码不会抛出任何异常,请别人的放心使用的蠢话. 我真的遇到不少,不少还是老
> 手!!
> 
> ======= 2005-02-22 09:26:18 您在来信中写道：=======
> 
>> 说的有道理, 在模块级确实是不应该捕获自己不关心且不能处理的异常的.
>> 这也是ftplib中的all_error为什么只定义了几种Exception,而不是把所有的异常都包括的原因.
>> 因为它也是只想处理自己能处理的异常.
>> all_error = ( socket.error, IOError, EOFError,  httplib.HTTPException,
>> Exception )
>> 
>> 
>> 但是据我观察, cry兄弟的代码已经是业务级的了,甚至可以说是业务逻辑顶层的代码了,
>> 如果此处再不捕获所有错误, 将直接抛出去给操作系统,导致程序异常中止.
>> 
>> 另外,我的异常捕获中还有一些代码以下列注释代替了
>> # do something other
>> 这里包括将异常重新抛出的处理方式, 具体怎么处理,就看具体业务的需要了.
>> 
>> 
>> ----- Original Message -----
>> From: "jian wang" <wangjian5748 at 163.com>
>> To: <python-chinese at lists.python.cn>
>> Sent: Monday, February 21, 2005 10:42 PM
>> Subject: Re: Re: Re: [python-chinese]怎么得到httplib的异常呢?
>> 
>> 
>>> hw_cg,您好！
>>> 
>>>   补充一点:千万不要在一个接口中捕捉所有异常,只捕捉此接口(或函数或方法)可以处理的异常,
>>> 对不能合理处理的异常,应该抛出,留给调用者处理,否则和业务有关的具体异常就无法正确处理
>>> 比如象这样的代码就不好:
>>> except Exception, msg:
>>>     print msg
>>>     # do something other
>>> 捕捉了所有异常,记住:本级不能合理处理的异常,抛出给调用者处理
>>> 
>>> ======= 2005-02-21 14:21:29 您在来信中写道：=======
>>> 
>>>> cry: 你好!
>>>> 
>>>> 借鉴其他语言的异常思想,不是这样写捕获语句的.
>>>> 你的捕获机制不完善,导致你漏掉了一些异常.
>>>> 
>>>> 建议你的异常捕获象下面这样分级捕获, 每个异常捕获语句仅捕获自己感兴趣的异常,
>>>> 最后使用Exception捕获所有未拦截的异常.
>>>> 
>>>> import httplib
>>>> import socket
>>>> 
>>>> try:
>>>>    conn = httplib.HTTPConnection("127.0.0.1:8080")
>>>>    conn.request("GET", "/")
>>>>    response = conn.getresponse()
>>>>    result = response.read()
>>>>    print result
>>>>    conn.close()
>>>> 
>>>> except socket.error, msg:
>>>>    print msg
>>>>    # do something other
>>>> 
>>>> except httplib.HTTPException,msg:
>>>>    print msg
>>>>    # do something other
>>>> 
>>>> except Exception, msg:
>>>>    print msg
>>>>    # do something other
>>>> 
>>>> 
>>>> 
>>>> 
>>>> ----- Original Message -----
>>>> From: "cry" <zyqmail at 163.net>
>>>> To: "limodou, python-chinese at lists.python.cn"
>>>> <limodou at gmail.com,python-chinese at lists.python.cn>
>>>> Sent: Monday, February 21, 2005 1:26 PM
>>>> Subject: Re: Re: [python-chinese] ????μ?μ1/2httplib μ??ì3￡??￡?
>>>> 
>>>> 
>>>> limodou，您好！
>>>> 
>>>> 直接用except:当然是没有问题，但是我需要错误信息呀，比如：
>>>> except error,msg:
>>>> 
>>>> 
>>>> 在 2005-02-21 12:22:00 您写道：
>>>>> 捕获Exception 不要httplib.HTTPException 试试
>>>>> 
>>>>> 
>>>>> On Mon, 21 Feb 2005 12:5:36 +0800, cry <zyqmail at 163.net> wrote:
>>>>>> python，您好！
>>>>>> 
>>>>>> 我做了如下的代码：
>>>>>> try:
>>>>>>         conn = httplib.HTTPConnection("192.168.1.103")
>>>>>>         conn.request("GET", "/")
>>>>>>         response = conn.getresponse()
>>>>>>         result = response.read()
>>>>>>         conn.close()
>>>>>>  except httplib.HTTPException , msg:
>>>>>>         print msg
>>>>>> 
>>>>>> 运行后：
>>>>>> Traceback (most recent call last):
>>>>>>   File "", line 3, in ?
>>>>>>   File "I:\Python23\lib\httplib.py", line 718, in request
>>>>>>     self._send_request(method, url, body, headers)
>>>>>>   File "I:\Python23\lib\httplib.py", line 739, in _send_request
>>>>>>     self.endheaders()
>>>>>>   File "I:\Python23\lib\httplib.py", line 712, in endheaders
>>>>>>     self._send_output()
>>>>>>   File "I:\Python23\lib\httplib.py", line 597, in _send_output
>>>>>>     self.send(msg)
>>>>>>   File "I:\Python23\lib\httplib.py", line 564, in send
>>>>>>     self.connect()
>>>>>>   File "I:\Python23\lib\httplib.py", line 532, in connect
>>>>>>     socket.SOCK_STREAM):
>>>>>> error: (10060, 'Operation timed out')
>>>>>> 
>>>>>> 错在那里呢？我怎么能控制httplib的exception呢？
>>>>>> 我这样处理ftplib就可以。
>>>>>> 
>>>>>> 谢谢。
>>>>>> 
>>>>>>                     致
>>>>>> 礼！
>>>>>> 
>>>>>>             cry
>>>>>>             zyqmail at 163.net
>>>>>> 
>>>>>> _______________________________________________
>>>>>> python-chinese list
>>>>>> python-chinese at lists.python.cn
>>>>>> http://python.cn/mailman/listinfo/python-chinese
>>>>>> 
>>>>> 
>>>>> 
>>>>> -- 
>>>>> I like python!
>>>>> My Blog: http://www.donews.net/limodou
>>>>> New Maillist: http://groups-beta.google.com/group/python-cn
>>>>> _______________________________________________
>>>>> python-chinese list
>>>>> python-chinese at lists.python.cn
>>>>> http://python.cn/mailman/listinfo/python-chinese
>>>> 
>>>>                    致
>>>> 礼！
>>>> 
>>>>            cry
>>>>            zyqmail at 163.net
>>>> 
>>>> 
>>>> _______________________________________________
>>>> python-chinese list
>>>> python-chinese at lists.python.cn
>>>> http://python.cn/mailman/listinfo/python-chinese___________________________
>>>> ____________________
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>>>> python-chinese at lists.python.cn
>>>> http://python.cn/mailman/listinfo/python-chinese
>>>> 
>>> 
>>> = = = = = = = = = = = = = = = = = = = =
>>> 
>>> 
>>> 　　　　　　　　致
>>> 礼！
>>>  
>>> 
>>> 　　　　　　　　jian wang
>>> 　　　　　　　　wangjian5748 at 163.com
>>> 　　　　　　　　　　2005-02-21
>>> 
>>> 
>> 
>> 
>> -----------------------------------------------------------------------------
>> ---
>> 
>> 
>>> _______________________________________________
>>> python-chinese list
>>> python-chinese at lists.python.cn
>>> http://python.cn/mailman/listinfo/python-chinese
>>> _______________________________________________
>> python-chinese list
>> python-chinese at lists.python.cn
>> http://python.cn/mailman/listinfo/python-chinese
>> 
> 
> = = = = = = = = = = = = = = = = = = = =
> 
> 
> 　　　　　　　　致
> 礼！
>  
> 
> 　　　　　　　　jian wang
> 　　　　　　　　wangjian5748 at 163.com
> 　　　　　　　　　　2005-02-22
> 
> _______________________________________________
> python-chinese list
> python-chinese at lists.python.cn
> http://python.cn/mailman/listinfo/python-chinese

标题：[python-chinese] 怎么得到 httplib 的异常呢 ?