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Groups > comp.lang.python > #89606
| From | Cecil Westerhof <Cecil@decebal.nl> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: seek operation in python |
| Organization | Decebal Computing |
| References | <8b2bd328-08a6-4211-85c4-8d117d1aae1e@googlegroups.com> <mailman.107.1430354001.3680.python-list@python.org> |
| Date | 2015-04-30 08:27 +0200 |
| Message-ID | <87vbge9lm6.fsf@Equus.decebal.nl> (permalink) |
Op Thursday 30 Apr 2015 02:33 CEST schreef Chris Angelico:
> On Thu, Apr 30, 2015 at 4:08 AM, siva sankari R <buddingrose11@gmail.com> wrote:
>> file=open("input","r")
>> line=file.seek(7)
>> print line
>>
>> The above code is supposed to print a line but it prints "none". I
>> don't know where the mistake is. Help.!
>
> Going right back to the beginning... Are you aware that 'seek' works
> with byte positions? On a text file, you can't even do this, and
> even on a byte file, it won't give you the seventh line.
>
> If, as you say, it's only some eighty lines of code, the best
> solution is probably the simplest: read the whole file into memory.
>
> 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.
--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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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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