Bengt Richter wrote:
> On Wed, 15 Feb 2006 18:57:26 -0800, Guido van Rossum <[EMAIL PROTECTED]>
> wrote:
>
>> [...]
>> My expectation is that the Py3k standard I/O library will do all of
>> its own conversions on top of binary files anyway -- if you missed it,
>> I'd like to get rid of any ties to C's stdio.
>>
> Would the standard I/O module have low level utility stream-processing
> generators
> to do things like linesep normalization in text or splitlines etc? I.e.,
> primitives
> that could be composed for unforseen usefulness, like unix pipeable stuff?
>
> Maybe they could even be composable with '|' for unixy left->right piping,
> e.g., on windows
>
> for line in (os.open('somepath') | linechunker | decoder('latin-1')): ...
>
> where os.open('path').__or__(linechunker) returns
> linechunker(os.open('path')),
> which in turn has an __or__ to do similarly. Just had this bf, but ISTM it
> reads ok.
> The equivalent nested generator expression with same assumed primitives would
> I guess be
>
> for line in decoder('latin-1')(linechunker(binaryfile('path'))): ...
>
> which doesn't have the same natural left to right reading order to match
> processing order.
I'm currently implementing something like this, which might go into
IPython. See http://styx.livinglogic.de/~walter/IPython/ipipe.py for
code. (This requires the current IPython svn trunk)
Examples:
for f in ils("/usr/lib/python2.3/") | ifilter("name.endswith('.py')"):
print f.name, f.size
for p in ipwd | ifilter("shell=='/bin/false'") | isort("uid") | \
ieval('"%s (%s)" % (_.name, _.gecos)'):
print p
The other part of the project is a curses based browser for the output
of these pipelines. See
http://styx.livinglogic.de/~walter/IPython/newdir.gif for a screenshot
of the result of ils("/usr/lib/python2.3/") |
ifilter("name.endswith('.py')")
Bye,
Walter Dörwald
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