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Re: seek operation in python

References (2 earlier) <87vbge9lm6.fsf@Equus.decebal.nl> <mailman.118.1430379207.3680.python-list@python.org> <87y4lavy4q.fsf@Equus.decebal.nl> <mailman.120.1430382699.3680.python-list@python.org> <87twvyvvct.fsf@Equus.decebal.nl>
Date 2015-04-30 19:39 +1000
Subject Re: seek operation in python
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.123.1430387214.3680.python-list@python.org> (permalink)

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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

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Thread

seek operation in python siva sankari R <buddingrose11@gmail.com> - 2015-04-29 11:08 -0700
  Re: seek operation in python Joel Goldstick <joel.goldstick@gmail.com> - 2015-04-29 14:17 -0400
    Re: seek operation in python siva sankari R <buddingrose11@gmail.com> - 2015-04-29 11:26 -0700
      Re: seek operation in python Billy Earney <billy.earney@gmail.com> - 2015-04-29 13:42 -0500
      Re: seek operation in python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-04-29 21:53 +0100
        Re: seek operation in python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-04-30 10:19 +1000
  Re: seek operation in python MRAB <python@mrabarnett.plus.com> - 2015-04-29 19:50 +0100
  Re: seek operation in python John Gordon <gordon@panix.com> - 2015-04-29 18:53 +0000
  Re: seek operation in python Chris Angelico <rosuav@gmail.com> - 2015-04-30 10:33 +1000
    Re: seek operation in python Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 08:27 +0200
      Re: seek operation in python Chris Angelico <rosuav@gmail.com> - 2015-04-30 17:33 +1000
        Re: seek operation in python Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 10:06 +0200
          Re: seek operation in python Dave Angel <davea@davea.name> - 2015-04-30 04:31 -0400
            Re: seek operation in python Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 11:06 +0200
              Re: seek operation in python Chris Angelico <rosuav@gmail.com> - 2015-04-30 19:39 +1000
          Re: seek operation in python Larry Hudson <orgnut@yahoo.com> - 2015-04-30 12:38 -0700
            Re: seek operation in python Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 22:50 +0200
              Re: seek operation in python Larry Hudson <orgnut@yahoo.com> - 2015-04-30 19:42 -0700
  Re: seek operation in python Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 14:31 +0200

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