Sorting of list containing tuples

[Ronny Mandal]

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

 

[Paul Rubin]

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]

Uhm, thanks. (I've used lambda-sort earlier, but quite forgot......)

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])

 

[Dave Hansen]

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

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

 

[Wojciech =?iso-8859-2?Q?Mu=B3a?=]

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)

 

[bearophileHUGS]

l = [(2,3),(3,2),(6,5)][(6, 5), (2, 3), (3, 2)]

Bye,
bearophile

 

[Christoph Haas]

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

 

[Christoph Haas]

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