Re: [patch] [python] Fix Python 3 build and testsuite issues

[<Paul_Koning@Dell.com>]

On Aug 21, 2013, at 10:59 AM, Tom Tromey <tromey@redhat.com> wrote:

> Phil> Strings in Python 3 are now always encoded and are encapsulated by the
> Phil> "str" class.
> 
> Phil> In Python 2 you had str() and unicode(), where unicode was encoded and
> Phil> str just represented bytes (IE just an unencoded string).
> 
> Phil> Reading around the suggestion seems to be to do this:
> 
> Phil> try:
> Phil>    # basestring catches both types of Python 2.x strings
> Phil>    if isinstance(sym, basestring)
> Phil>         return True
> Phil> except NameError:
> Phil>    # If we are here, basestring does not exist, so Python 3.x
> Phil>    if isinstance(sym, str)
> Phil>         return True
> Phil> # Continue to process objects that are not a string.
> 
> We can do this check once, at top-level:
> 
> 
> try:
>   if isinstance('hi', basestring):
>      def is_string(x):
>         return isinstance(x, basestring)
> except NameError:
>   def isinstance(x):
>     return isinstance(x, str)
> 
> 
> Maybe duck typing is still preferable though.
> 
> Not sure if this needs a third def in case the 'if' fails without throwing.
> Probably not.

I would write it this way:
try:
    basestring
except NameError:
    basestring = str

Similar techniques can be used for type "long" which isn't in Python 3 either.

 --paul
From gdb-patches-return-104503-listarch-gdb-patches=sources.redhat.com@sourceware.org Wed Aug 21 15:42:46 2013
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Date: Wed, 21 Aug 2013 15:42:00 -0000
From: "Joseph S. Myers" <joseph@codesourcery.com>
To: Walfred Tedeschi <walfred.tedeschi@intel.com>
CC: <tromey@redhat.com>, <jan.kratochvil@redhat.com>,	<mark.kettenis@xs4all.nl>, <gdb-patches@sourceware.org>
Subject: Re: [PATCH 0/7] Intel(R) MPX registers support.
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If a user does a function call from GDB, or tells GDB to return from a
function, and BNDPRESERVE is zero, will it act as a BND-prefixed branch
that preserves the bounds registers or as a non-BND-prefixed branch that
clears the bounds registers?  (It's not obvious that there is one answer
that's best in all circumstances.)

--
Joseph S. Myers
joseph@codesourcery.com