[EMAIL PROTECTED] (Alex Martelli) writes:
> > for line in file_lines(filename):
> > crunch(line)
>
> I'm +/-0 on this one vs the idioms:
> with open(filename) as f:
> for line in f: crunch(line)
> Making two lines into one is a weak use case for a stdlib function.
Well, the inspiration is being able to use the iterator in another
genexp:
for line in (ichain(file_lines(x) for x in all_filenames)):
crunch(line)
so it's making more than two lines into one, and just flows more
naturally, like the perl idiom "while(<>) {...}".
> > lsect and rsect allow making what Haskell calls "sections". Example:
> > # sequence of all squares less than 100
> > from operator import lt
> > s100 = takewhile(rsect(lt, 100), (x*x for x in count()))
>
> Looks like they'd be useful, but I'm not sure about limiting them to
> working with 2-argument functions only.
I'm not sure how to generalize them but if there's an obvious correct
way to do it, that sounds great ;).
Also forgot to include the obvious:
def compose(f,g):
return lambda(*args,**kw): f(g(*args,**kw))
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