gene tani wrote:
> Um, you shd 1st search cookbook, or Vaults Parnassu, dmoz python
> section, pypackage:
>
> http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/347689
which includes e.g.
def each_slice_lol(listin,n):
"""non-overlapp'g slices, return (list of lists) """
len_listin=len(listin)
return [listin[i:min(len_listin, i+n)] for i in range(0,len_listin,n)]
and the listin[i:min(len_listin, i+n)] is grossly wasteful; it does
EXACTLY the same as listin[i:i+n] for the values of i and n that make sense.
From the Python reference manual:
"""The semantics for a simple slicing are as follows. The primary must
evaluate to a sequence object. The lower and upper bound expressions, if
present, must evaluate to plain integers; defaults are zero and the
sys.maxint, respectively. If either bound is negative, the sequence's
length is added to it. The slicing now selects all items with index k
such that i <= k < j where i and j are the specified lower and upper
bounds. This may be an empty sequence. It is not an error if i or j lie
outside the range of valid indexes (such items don't exist so they
aren't selected).
"""
--
http://mail.python.org/mailman/listinfo/python-list
