tiago almeida wrote:
Hello all,
I'd like to ask how you'd implement a function /f/ that transforms a
list of elements into a list of lists of elements by grouping
contiguous elements together.
Examples:
a=[1,2,3,4,5]
print( f(a, 2) ) # -> [ [1, 2], [3, 4], [5] ]
print( f(a, 3) ) # -> [ [1, 2, 3], [4, 5] ]
print( f(a, 1) ) # -> [ [1], [2], [3], [4], [5] ]
I have done a small function that does this using a while loop but
what I'm looking for is a more /pythonic/ way to do this. Maybe some
function in some standard Module does this and I don't know?
Ps: I don't post the function here because I don't have it with me.
Thanks a lot in advance!
Tiago Almeida
tiago.b.alme...@gmail.com <mailto:tiago.b.alme...@gmail.com>
using list comprehention
(http://docs.python.org/tutorial/datastructures.html)
# note: poor naming
def func(l, slice):
r = range(0, len(l), slice)
result = [l[sl:sl+slice] for sl in r]
print result
>>> a=[1,2,3,4,5]
>>> func(a,1) ; func(a,2) ; func(a,3)
[[1], [2], [3], [4], [5]]
[[1, 2], [3, 4], [5]]
[[1, 2, 3], [4, 5]]
I would add that I personally find list comprehension hard to read, so
I'm not sure it is that pythonic. Your old school while loop could be
less concise/elegant, but perfectly readable.
Jean-Michel
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