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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Why no warnings when re-assigning builtin names?
Date: Tue, 16 Aug 2011 22:15:03 -0400
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:11651

On 8/16/2011 8:18 PM, Philip Semanchuk wrote:

> Hi Terry,
> To generalize from your example, are you saying that there's a mild admonition
 > against shadowing builtins with unrelated variable names in standard 
lib code?

I would expect that there might be. I would have to check PEP8.

> Here's an example from Python 3.2.1's argparse.py, lines 466-473.
 > "open" is shadowed on the second line.
>
>          # clean up separators for mutually exclusive groups
>          open = r'[\[(]'
>          close = r'[\])]'
>          text = _re.sub(r'(%s) ' % open, r'\1', text)
>          text = _re.sub(r' (%s)' % close, r'\1', text)
>          text = _re.sub(r'%s *%s' % (open, close), r'', text)
>          text = _re.sub(r'\(([^|]*)\)', r'\1', text)
>          text = text.strip()

-- 
Terry Jan Reedy