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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Tue, 20 Nov 2012 12:37:01 -0700
Subject: Re: re.search when used within an if/else fails
To: Python <python-list@python.org>
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Xref: csiph.com comp.lang.python:33649

On Tue, Nov 20, 2012 at 12:09 PM, Kevin T <kevinintx@gmail.com> wrote:
> #if re.search( "rsrvd", sigName ) :   #version a
> #if re.search( "rsrvd", sigName ) == None :   #version b
> if re.search( "rsrvd", sigName ) is None :   #version bb
>    print sigName
>    newVal = "%s%s" % ('1'*signal['bits'] , newVal )
> #else:                                 #version c
> if re.search( "rsrvd", sigName ) != None :   #version d
>    print sigName
>    newVal = "%s%s" % ( '0'*signal['bits'],> newVal )
>
> i can use either version a/b the else clause (version c) will not execute.
> fortunately,  with version bb, the else clause will execute!!

There must be some other difference in your testing.  I don't have
Python 2.4 available, but I tried your version a in both Python 2.3
and 2.5 using made-up values for sigName, and the else clause is
executed in both.