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Groups > comp.lang.python > #68375
| From | Mark Lawrence <breamoreboy@yahoo.co.uk> |
|---|---|
| Subject | Re: Sharing: File Reader Generator with & w/o Policy |
| Date | 2014-03-16 01:32 +0000 |
| References | <lg2h87$6fj$1@speranza.aioe.org> <mailman.8156.1394920773.18130.python-list@python.org> <lg2te7$oq$1@speranza.aioe.org> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.8157.1394933542.18130.python-list@python.org> (permalink) |
On 16/03/2014 01:06, Mark H Harris wrote:
> On 3/15/14 4:56 PM, MRAB wrote:
>
>>
>> You can also shorten it somewhat:
>
> Thanks, I like it... I shortened the fnName() also:
>
> #---------------------------------------------------------
> # fn2Name(filename) generator: file reader iterable
> #---------------------------------------------------------
> def fn2Name(filename):
> try:
> with open(filename, 'r') as fh: <=========== can you tell me
> line_count = 0
> for linein in fh:
> lineout = linein.strip('\n')
> length = len(lineout)
> yield((line_count, length, lineout))
> line_count+=1
> except FileNotFoundError as err_code:
> print(err_code)
>
> #---------------------------------------------------------
>
>
> ... where I can go to find out (for specific contexts) what the
> __init__() and __exit__() are actually doing, like for instance in this
> case does the filename get closed in __exit__(), and also if errors
> occur does the file close automatically? thanks
>
> marcus
Start here
http://docs.python.org/3/library/stdtypes.html#context-manager-types
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
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Sharing: File Reader Generator with & w/o Policy Mark H Harris <harrismh777@gmail.com> - 2014-03-15 16:38 -0500
Re: Sharing: File Reader Generator with & w/o Policy MRAB <python@mrabarnett.plus.com> - 2014-03-15 21:56 +0000
Re: Sharing: File Reader Generator with & w/o Policy Mark H Harris <harrismh777@gmail.com> - 2014-03-15 19:36 -0500
Re: Sharing: File Reader Generator with & w/o Policy Mark H Harris <harrismh777@gmail.com> - 2014-03-15 19:45 -0500
Re: Sharing: File Reader Generator with & w/o Policy Mark H Harris <harrismh777@gmail.com> - 2014-03-15 20:06 -0500
Re: Sharing: File Reader Generator with & w/o Policy Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-16 01:32 +0000
Re: Sharing: File Reader Generator with & w/o Policy Mark H Harris <harrismh777@gmail.com> - 2014-03-15 21:52 -0500
Re: Sharing: File Reader Generator with & w/o Policy Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-16 02:01 +0000
Re: Sharing: File Reader Generator with & w/o Policy Mark H Harris <harrismh777@gmail.com> - 2014-03-15 22:34 -0500
Re: Sharing: File Reader Generator with & w/o Policy Chris Angelico <rosuav@gmail.com> - 2014-03-16 14:48 +1100
Re: Sharing: File Reader Generator with & w/o Policy Mark H Harris <harrismh777@gmail.com> - 2014-03-15 23:47 -0500
Re: Sharing: File Reader Generator with & w/o Policy Chris Angelico <rosuav@gmail.com> - 2014-03-16 16:41 +1100
Re: Sharing: File Reader Generator with & w/o Policy Mark H Harris <harrismh777@gmail.com> - 2014-03-16 01:19 -0500
Re: Sharing: File Reader Generator with & w/o Policy Chris Angelico <rosuav@gmail.com> - 2014-03-16 17:37 +1100
Re: Sharing: File Reader Generator with & w/o Policy Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-16 10:36 +0000
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