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Date: Thu, 30 Apr 2015 19:39:10 +1000
Subject: Re: seek operation in python
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:89618

On Thu, Apr 30, 2015 at 7:06 PM, Cecil Westerhof <Cecil@decebal.nl> wrote:
> I already done it. I thought it not to much work. And it even makes
> some code shorter:
> -    marshal_file    = open(expanduser(marshal_filename), 'r')
> -    not_list        = load(marshal_file)
> -    marshal_file.close()
> -    return not_list
> +    with open(expanduser(marshal_filename), 'r') as f:
> +        return load(f)
>
> But here I did the close myself already, so that is not completely
> honest of me. ;-)

The context manager makes your code more concise AND more reliable -
an exception thrown by load() will skip the explicit close(), but the
'with' block unwinds correctly whether there's an exception or not.

ChrisA