Chris Rebert ha scritto:
On Sat, Apr 11, 2009 at 1:44 AM, Matteo <tadweles...@gmail.com> wrote:
Hi all,
let's see if there is a more "pythonic" way of doing what I'm trying
to do.
I have a lot of strings with numbers like this one:
string = "-1 1.3 100.136 1 2.6 100.726 1 3.9 101.464 -1 5.2 102.105"
I need to pass the numbers to a function, but three at a time, until
the string ends. The strings are of variable length, but always a
multiple of three.
That's what I did:
num = string.split()
for triple in zip(num[::3], num[1::3], num[2::3]):
func(*triple)
it works and I like slices, but I was wondering if there was another
way of doing the same thing, maybe reading the numbers in groups of
arbitrary length n...
See the grouper() recipe in the `itertools` module --
http://docs.python.org/library/itertools.html
Cheers,
Chris
I would do that with a generator:
>>> def groups(l,n) :
... while l: yield l[:n]; l=l[n:]
...
>>> list(groups(range(14),4))
[[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13]]
>>> list(groups(range(18),3))
[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11], [12, 13, 14], [15, 16, 17]]
Ciao
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FB
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