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Groups > comp.lang.python > #39114

Re: improving performance of writing into a pipe

Date 2013-02-18 11:12 -0700
From Michael Torrie <torriem@gmail.com>
Subject Re: improving performance of writing into a pipe
References <76620a9e-45fe-499d-b1bf-06b1d2a91c25@googlegroups.com> <mailman.1952.1361200943.2939.python-list@python.org> <16e85bd1-6e5d-4d70-95bf-cc6b986a9f7c@googlegroups.com> <kftm2l$b84$1@r03.glglgl.gl> <8f26ac4d-4732-46ac-bf4e-877696b22241@googlegroups.com>
Newsgroups comp.lang.python
Message-ID <mailman.1958.1361211131.2939.python-list@python.org> (permalink)

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On 02/18/2013 10:00 AM, mikprog@gmail.com wrote:
> [..]
>>
>> I don't see an exception in your answer. Where did you put it for us?
>>
> 
> well I just did print a message:
> 
>     PIPEPATH = ["/tmp/mypipe"]
> 
> [..]
>         try:
>             self.process = os.popen( self.PIPEPATH, 'w')
>         except:
>             print "Error while trying opening the pipe!"
>             print "check: ", self.PIPEPATH
>             exit()
> 
> I see the error messages.

Unfortunately your attempt to catch this exception is hiding the true
cause.  You need to give us the actual exception.  Otherwise it could be
anything from self.PIPEPATH not existing to who knows what.

Almost never do you want to catch all exceptions like you're doing.  You
should only catch the specific exceptions you know how to deal with in
your code.

For testing purposes, if your code really is as you put it, then
catching exceptions is kind of silly since you're just re-raising the
exception (sort of) but without any contextual information that would
make the error meaningful.

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improving performance of writing into a pipe mikprog@gmail.com - 2013-02-18 07:12 -0800
  Re: improving performance of writing into a pipe Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-18 15:21 +0000
    Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-18 08:31 -0800
      Re: improving performance of writing into a pipe Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2013-02-18 17:49 +0100
        Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-18 09:00 -0800
          Re: improving performance of writing into a pipe Michael Torrie <torriem@gmail.com> - 2013-02-18 11:12 -0700
            Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 01:24 -0800
              Re: improving performance of writing into a pipe Peter Otten <__peter__@web.de> - 2013-02-19 10:55 +0100
                Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 02:27 -0800
                Re: improving performance of writing into a pipe Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-19 11:15 +0000
                Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 02:27 -0800
              Re: improving performance of writing into a pipe Michael Torrie <torriem@gmail.com> - 2013-02-19 10:47 -0700
                Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-20 09:54 -0800
                Re: improving performance of writing into a pipe John Gordon <gordon@panix.com> - 2013-02-20 18:39 +0000
                Re: improving performance of writing into a pipe Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-20 22:05 +0000
                Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-20 09:54 -0800
            Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 01:24 -0800
    Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-18 08:31 -0800
  Re: improving performance of writing into a pipe Serhiy Storchaka <storchaka@gmail.com> - 2013-02-18 21:29 +0200
    Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 04:10 -0800
    Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 04:10 -0800
    Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 05:39 -0800
      Re: improving performance of writing into a pipe Peter Otten <__peter__@web.de> - 2013-02-19 14:57 +0100
        Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 06:38 -0800
        Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 06:38 -0800
    Re: improving performance of writing into a pipe mikprog@gmail.com - 2013-02-19 05:39 -0800

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