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Re: ConnectionError handling problem

Date 2015-10-01 07:30 +1000
From Cameron Simpson <cs@zip.com.au>
Subject Re: ConnectionError handling problem
References <ff56fdf3-e40b-4ebf-8f4a-524f3ce61fbd@googlegroups.com>
Newsgroups comp.lang.python
Message-ID <mailman.278.1443649730.28679.python-list@python.org> (permalink)

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On 29Sep2015 23:04, shiva upreti <katewinslet626@gmail.com> wrote:
>On Friday, September 25, 2015 at 12:55:01 PM UTC+5:30, Cameron Simpson wrote:
>> Ok. You original code says:
>>
>>   try:
>>     r=requests.post(url, data=query_args)
>>   except:
>>     print "Connection error"
>>
>> and presumably we think your code is hanging inside the requests.post call? You
>> should probably try to verify that, because if it is elsewhere you need to
>> figure out where (lots of print statements is a first start on that).
>> I would open two terminals. Run your program until it hangs in one.
[...various things to do to check _exactly_ where the hang is occurring...]
>
>Yes I use ubuntu 14.04. I will try what you suggested. But I cant understand 
>one thing, for whatever reason the script is hanging, why does it resumes 
>almost instantaneously when I press CTRL+C.

Most likely the Ctrl-C interrupts whatever system call is hanging, causing it 
to return (failed, probably with errno EINTR). And the python program resumes 
because the OS system call has returned.

Cheers,
Cameron Simpson <cs@zip.com.au>

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Re: ConnectionError handling problem Cameron Simpson <cs@zip.com.au> - 2015-09-25 09:25 +1000
  Re: ConnectionError handling problem shiva upreti <katewinslet626@gmail.com> - 2015-09-24 20:57 -0700
    Re: ConnectionError handling problem Cameron Simpson <cs@zip.com.au> - 2015-09-25 14:59 +1000
      Re: ConnectionError handling problem shiva upreti <katewinslet626@gmail.com> - 2015-09-24 22:46 -0700
        Re: ConnectionError handling problem Cameron Simpson <cs@zip.com.au> - 2015-09-25 17:24 +1000
          Re: ConnectionError handling problem shiva upreti <katewinslet626@gmail.com> - 2015-09-29 23:04 -0700
            Re: ConnectionError handling problem Cameron Simpson <cs@zip.com.au> - 2015-10-01 07:30 +1000
            Re: ConnectionError handling problem Laura Creighton <lac@openend.se> - 2015-09-30 23:56 +0200

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