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python file API

Mark Lawrence breamoreboy at yahoo.co.uk
Tue Sep 25 06:51:56 EDT 2012 
On 25/09/2012 11:38, Oscar Benjamin wrote:
> On 25 September 2012 08:27, Mark Lawrence <breamoreboy at yahoo.co.uk> wrote:
>
>> On 25/09/2012 03:32, Mark Adam wrote:
>>
>>> On Mon, Sep 24, 2012 at 5:55 PM, Oscar Benjamin
>>> <oscar.j.benjamin at gmail.com> wrote:
>>>
>>>> try:
>>>>       f.pos = 256
>>>> except IOError:
>>>>       print('Unseekable file')
>>>
>>>
>> Something along these lines http://docs.python.org/dev/**
>> whatsnew/3.3.html#pep-3151-**reworking-the-os-and-io-**exception-hierarchy<http://docs.python.org/dev/whatsnew/3.3.html#pep-3151-reworking-the-os-and-io-exception-hierarchy>?
>
>
> I just tried to find out what error would be raised by seeking on a file
> that doesn't support seeking and II think it's just OSError in the reworked
> hierarchy. The error in Python 2.7 is
>
> Traceback (most recent call last):
>    File "tmp.py", line 2, in <module>
>      sys.stdin.seek(5)
> IOError: [Errno 29] Illegal seek
>
> This corresponds to ESPIPE from errno.h which isn't referred to anywhere in
> pip 3151:
> http://www.python.org/dev/peps/pep-3151/
>
> So I guess it would still need to be
>
> try:
>      f.pos = 256
> except OSError as e:
>      if e.errno != 29:
>          raise
>      print('Unseekable file')
>
> Oscar
>
>
>

The thing I was thinking of is actually in the thread "syntax to 
continue into the next subsequent except block" over on Python ideas.

-- 
Cheers.

Mark Lawrence.
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