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List:       python-ideas
Subject:    Re: [Python-ideas] getitem() (was Re: [Python-Dev] PEP 463: Exception-catching expressions)
From:       Chris Angelico <rosuav () gmail ! com>
Date:       2014-02-22 5:38:54
Message-ID: CAPTjJmpX9ODJGGzEbRt118sTvFDhmsefjmKUi7od+pREsLd+ww () mail ! gmail ! com
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On Sat, Feb 22, 2014 at 4:14 PM, Eric Snow <ericsnowcurrently@gmail.com> wrote:
>   def getitem(seq, index, default=_NOT_SET):
>       try:
>           return seq[index]
>       except IndexError:
>           if default is _NOT_SET:
>               raise
>           return default
>
> Of course, one might expect getitem() to work for mappings too (or
> we'd have 2 distinct functions for mappings and sequences).  Having
> getitem() work for both would not be too hard.

Very easy. Just catch LookupError or (IndexError, KeyError) instead of
IndexError.

ChrisA
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