Hi!
Assume we have a list l, containing tuples t1,t2...
i.e. l = [(2,3),(3,2),(6,5)]
And now I want to sort l reverse by the second element in the tuple,
i.e the result should ideally be:
l = [(6,5),(2,3),(3,2)]
Any ideas of how to accomplish this?
Thanks,
Ronny Mandal 7 15276
Ronny Mandal <ro*****@math.uio.no> writes: And now I want to sort l reverse by the second element in the tuple, i.e the result should ideally be:
l = [(6,5),(2,3),(3,2)]
sorted(l, key = lambda a: -a[1])
Uhm, thanks. (I've used lambda-sort earlier, but quite forgot......)
:)
On 18 May 2006 12:38:55 -0700, Paul Rubin
<http://ph****@NOSPAM.invalid> wrote: Ronny Mandal <ro*****@math.uio.no> writes: And now I want to sort l reverse by the second element in the tuple, i.e the result should ideally be:
l = [(6,5),(2,3),(3,2)]
sorted(l, key = lambda a: -a[1])
Ronny Mandal wrote: Assume we have a list l, containing tuples t1,t2...
i.e. l = [(2,3),(3,2),(6,5)]
And now I want to sort l reverse by the second element in the tuple, i.e the result should ideally be:
l = [(6,5),(2,3),(3,2)]
Any ideas of how to accomplish this?
def cmpfun(a,b):
return cmp(b[1],a[1])
l.sort(cmpfun)
On Thu, 18 May 2006 21:29:59 +0200 in comp.lang.python, Ronny Mandal
<ro*****@math.uio.no> wrote: Hi!
Assume we have a list l, containing tuples t1,t2...
i.e. l = [(2,3),(3,2),(6,5)]
And now I want to sort l reverse by the second element in the tuple, i.e the result should ideally be:
l = [(6,5),(2,3),(3,2)]
Any ideas of how to accomplish this?
Thanks,
Ronny Mandal def my_cmp(t1,t2):
c1 = t1[1]
c2 = t2[1]
if c1 > c2: return 1
if c2 > c1: return -1
return 0 l
[(2, 3), (3, 2), (6, 5)] l.sort(cmp=my_cmp, reverse = True) l
[(6, 5), (2, 3), (3, 2)]
HTH,
-=Dave
--
Change is inevitable, progress is not.
>>> l = [(2,3),(3,2),(6,5)] from operator import itemgetter sorted(l, key=itemgetter(1), reverse=True)
[(6, 5), (2, 3), (3, 2)]
Bye,
bearophile
On Thu, May 18, 2006 at 12:38:55PM -0700, Paul Rubin wrote: Ronny Mandal <ro*****@math.uio.no> writes: And now I want to sort l reverse by the second element in the tuple, i.e the result should ideally be:
l = [(6,5),(2,3),(3,2)]
sorted(l, key = lambda a: -a[1])
Or in Python <2.4:
l.sort(lambda x,y: x[1]-y[1])
(Although that's not technically perfect. Sort expect a function that
returns -1, 0 or 1. Here we get positive integers and negative
integers. YMMV.)
Kindly
Christoph
On Thu, May 18, 2006 at 09:52:39PM +0200, Christoph Haas wrote: On Thu, May 18, 2006 at 12:38:55PM -0700, Paul Rubin wrote: Ronny Mandal <ro*****@math.uio.no> writes: And now I want to sort l reverse by the second element in the tuple, i.e the result should ideally be:
l = [(6,5),(2,3),(3,2)]
sorted(l, key = lambda a: -a[1])
Or in Python <2.4:
l.sort(lambda x,y: x[1]-y[1])
(Although that's not technically perfect. Sort expect a function that returns -1, 0 or 1. Here we get positive integers and negative integers. YMMV.)
Crap... why do I always forget about cmp()? :)
This should be it:
l.sort(lambda x,y: cmp(x[1],y[1]))
Kindly
Christoph This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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