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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: The opener parameter of Python 3 open() built-in
Date: Mon, 03 Sep 2012 23:19:51 -0400
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Xref: csiph.com comp.lang.python:28386

On 04 Sep 2012 01:13:09 GMT, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> declaimed the following in
gmane.comp.python.general:


> 
> Why does the open builtin need this added complexity? Why not just call 
> os.open directly? Or for more complex openers, just call the opener 
> directly?
>
	Because os.open() returns a low-level file descriptor, not a Python
file object?

> What is the rationale for complicating open instead of telling people to 
> just call their opener directly?

	To avoid the new syntax would mean coding the example as

	f = os.fdopen(os.open("newfile", flags | os.O_EXCL), "w") 

which does NOT look any cleaner to me... Especially not if "opener" is
to be used in more than one location. Furthermore, using "opener" could
allow for a localized change to affect all open statements in the module
-- change file path, open for string I/O rather than file I/O, etc.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/