Nested generators is the python equivalent of unix pipe cmds.
Steven D. Majewski
sdm7g at Virginia.EDU
Fri Aug 3 16:27:38 EDT 2001
On Fri, 3 Aug 2001, Terry Reedy wrote:
>
> I noticed the same. A genpipe wrapping rclass would give us the very
> clear:
>
> for f in gen(Files('.')).Test(isGif).Count(20)
>
> My untested idea for genpipe:
>========<
Thanks, Terry.
Tested and corrected:
>
> class genpipe:
> def __init__(self, generator):
> self.gen = generator #sanity check omitted
> def Test(self, pred):
> self.gen = _Test(self.gen, pred) # ditto for Count and other
--> return self
> filters
> def __iter__(self):
--> return self.gen
##> return self.gen.next
>>> for x in Genpipe( Files('.')).Test( isGif ).Count(10):
... print x
...
./aaTristan/usd.gif
./aaTristan/welcome_dude2.gif
./Desktop/coffee-bg.gif
./Desktop/New Dowloads/xlsappdoc/data-classes.GIF
./Desktop/New Dowloads/xlsappdoc/graph-overlay-classes.GIF
./Desktop/sdm7g-3.GIF
./Documents/Dilbert/941202.gif
./Documents/Dilbert/adding-staff.gif
./Documents/Dilbert/behind-schedule.gif
./Documents/Dilbert/d941231.gif
-- Steve
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