On Fri, 20 Mar 2009, paul bedaride wrote:
I propose a new function for list for pack values of a list and
sliding over them:
then we can do things like this:
for i, j, k in pack(range(10), 3, partialend=False):
print i, j, k
I propose this because i need a lot of times pack and slide function
over list and this one
combine the two in a generator way.
See the Python documentation for zip():
http://docs.python.org/library/functions.html#zip
And this article in which somebody independently rediscovers the idea:
http://drj11.wordpress.com/2009/01/28/my-python-dream-about-groups/
Summary: except for the "partialend" parameter, this can already be done
in a single line. It is not for me to say whether this nevertheless would
be useful as a library routine (if only perhaps to make it easy to specify
"partialend" explicitly).
It seems to me that sometimes one would want izip instead of zip. And I
think you could get the effect of partialend=True in 2.6 by using
izip_longest (except with an iterator result rather than a list).
def pack(l, size=2, slide=2, partialend=True):
lenght = len(l)
for p in range(0,lenght-size,slide):
def packet():
for i in range(size):
yield l[p+i]
yield packet()
p = p + slide
if partialend or lenght-p == size:
def packet():
for i in range(lenght-p):
yield l[p+i]
yield packet()
Isaac Morland CSCF Web Guru
DC 2554C, x36650 WWW Software Specialist
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