Re: better way to write this function
- From: Ricardo Aráoz <ricaraoz@xxxxxxxxx>
- Date: Mon, 26 Nov 2007 14:07:09 -0300
Peter Otten wrote:
Kelie wrote:
Hello,
This function does I what I want. But I'm wondering if there is an
easier/better way. To be honest, I don't have a good understanding of
what "pythonic" means yet.
def divide_list(lst, n):
"""Divide a list into a number of lists, each with n items. Extra
items are
ignored, if any."""
cnt = len(lst) / n
rv = [[None for i in range(n)] for i in range(cnt)]
for i in range(cnt):
for j in range(n):
rv[i][j] = lst[i * n + j]
return rv
You can use slicing:
... return [items[start:start+n] for n in range(0, len(items)-n+1, n)]def chunks(items, n):
...
... print chunks(range(5), i)for i in range(1,10):
...
[[0], [1], [2], [3], [4]]
[[0, 1], [2, 3]]
[[0, 1, 2]]
[[0, 1, 2, 3]]
[[0, 1, 2, 3, 4]]
[]
[]
[]
[]
This won't work(e.g. you don't define "start", you change the value of n
through the loop). I guess you meant :
def chunks(items, n) :
return [items[i:i+n] for i in range(0, len(items)-n+1, n)]
.
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