Python论坛的帖子：

Tue Feb 22 09:26:18 HKT 2005

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] ÔõÃ´µÃµ½httplib µÄÒì³£ÄØ£¿
> >
> >
> >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_______________________________________________
> >python-chinese list
> >python-chinese at lists.python.cn
> >http://python.cn/mailman/listinfo/python-chinese
> >
> 
> = = = = = = = = = = = = = = = = = = = =
> 
> 
> 　　　　　　　　致
> 礼！
>  
> 
> 　　　　　　　　jian wang
> 　　　　　　　　wangjian5748 at 163.com
> 　　　　　　　　　　2005-02-21
> 
> 

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