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Groups > comp.lang.python > #89609
| References | <8b2bd328-08a6-4211-85c4-8d117d1aae1e@googlegroups.com> <mailman.107.1430354001.3680.python-list@python.org> <87vbge9lm6.fsf@Equus.decebal.nl> |
|---|---|
| Date | 2015-04-30 17:33 +1000 |
| Subject | Re: seek operation in python |
| From | Chris Angelico <rosuav@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.118.1430379207.3680.python-list@python.org> (permalink) |
On Thu, Apr 30, 2015 at 4:27 PM, Cecil Westerhof <Cecil@decebal.nl> wrote:
>> with open("input.cpp") as f:
>> lines = f.readlines()
>> print(lines[7])
>
> Is the following not better:
> print(open('input.cpp', 'r').readlines()[7])
>
> Time is the same (about 25 seconds for 100.000 calls), but I find this
> more clear.
The significant difference is that the 'with' block guarantees to
close the file promptly. With CPython it probably won't make a lot of
difference, and in a tiny script it won't do much either, but if you
do this on Jython or IronPython or MicroPython or some other
implementation, it may well make a gigantic difference - your loop
might actually fail because the file's still open.
ChrisA
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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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