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Date: Wed, 1 May 2013 02:06:43 +1000
Subject: Re: shmid = shmget(SHM_KEY, SHM_SIZE, 0o666) - syntax error.
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:44552

On Wed, May 1, 2013 at 1:58 AM, Dave Angel <davea@davea.name> wrote:
> On 04/30/2013 11:49 AM, Chris Angelico wrote:
>>
>> On Wed, May 1, 2013 at 1:43 AM, Dave Angel <davea@davea.name> wrote:
>>>
>>> On 04/30/2013 11:27 AM, tromeo@mdlogix.com wrote:
>>>>
>>>>
>>>>
>>>> Please help me to debug
>>>>
>>>> -------
>>>> shmid = shmget(SHM_KEY, SHM_SIZE, 0o666)
>>>>                                                                      ^
>>>> SyntaxError: invalid syntax
>>>>
>>>
>>> 0o666 is indeed a syntax error.  What is that value supposed to be?  If
>>> it's
>>> intended to be an int that's equal to octal 666, just use 438
>>
>>
>> Without checking docs, I would guess that to be Unix file permissions,
>> which make most sense in octal.
>>
>>
>
> So put the octal description in the comment.  I think the Python 2.x syntax
> for octal is a travesty.  And of course it's non-portable to Python 3.  I
> would not intentionally leave 0666 in my source code, unless there was some
> other overriding reason for it.  And then I'd surround it with snide
> remarks.

Here's a stupid way to convert octal to decimal in Python:

>>> ord("\666")
438

Because backslash escapes in strings are, per convention, done in
octal. :) And actually, on the extremely rare occasions when they're
NOT octal, it's highly confusing.

http://rosuav.blogspot.com.au/2012/12/i-want-my-octal.html

ChrisA