python file API

[Oscar Benjamin]

On 25 September 2012 11:51, Mark Lawrence <breamoreboy at yahoo.co.uk> wrote:

> 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<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/<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.


This?

try:
     f.pos = 256
except OSError as e if e.errno == 29:
     print('Unseekable file')

Oscar
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20120925/2d858ee5/attachment.html>