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From: Joshua Landau <joshua@landau.ws>
Date: Tue, 6 Aug 2013 12:44:34 +0100
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Subject: Re: Sort lines in a plain text file alphanumerically
To: Chris Angelico <rosuav@gmail.com>
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On 6 August 2013 11:52, Chris Angelico <rosuav@gmail.com> wrote:
> On Tue, Aug 6, 2013 at 11:38 AM, Devyn Collier Johnson
> <devyncjohnson@gmail.com> wrote:
>>     with open('/home/collier/pytest/sort.TXT') as file:
>>         sorted(file, key=3Dstr.casefold, reverse=3DTrue)
>>
>>
>> Thanks for the advice Joshua. I find these tips very useful. However, ho=
w
>> would I close the files, or would they close after the "with" construct =
is
>> complete?
>
>
> That's the whole point of 'with'. It calls open(),

To be pedantic, it does not. open is called by the time the with gets invol=
ved.

> then calls
> __enter__, and it guarantees to call __exit__ before executing any
> code following the with block. With a file object, __exit__ will close
> the file.


To make it more obvious for Devyn=C2=B9, with is used any time you need a
simple guarantee of when things are "closed", for any particular
meaning. One popular usage, just as a taster, is with changing
directories so that the original directory is restored upon completion
of the sub-tasks.

=C2=B9 And so it doesn't look like I wrote a whole post to be pedantic