problem with sorting

[ankitks.mital@gmail.com]

>>dict = {'M':3, 'R':0, 'S':2}

>>print dict

{'S': 2, 'R': 0, 'M': 3}

now if I wanted sorted values in list, i am not able to do this

>>print dict.values().s ort()

None

it returns None instead of [0, 2, 3]

[Paddy]

Re: problem with sorting

On Mar 28, 5:38 am, ankitks.mi...@g mail.com wrote:

>dict = {'M':3, 'R':0, 'S':2}
>print dict

>
{'S': 2, 'R': 0, 'M': 3}
>
now if I wanted sorted values in list, i am not able to do this>>print dict.values().s ort()
>
None
>
it returns None instead of [0, 2, 3]

Try:

from pprint import pprint as pp
pp(my_dict)


It works well for other built-in types too.

P.S it is not good to use a name, dict, that already has a use in
Python.

- Paddy.

[jwelby]

Re: problem with sorting

On Mar 28, 5:38 am, ankitks.mi...@g mail.com wrote:

>dict = {'M':3, 'R':0, 'S':2}
>print dict

>
{'S': 2, 'R': 0, 'M': 3}
>
now if I wanted sorted values in list, i am not able to do this>>print dict.values().s ort()
>
None
>
it returns None instead of [0, 2, 3]

The sort method works by sorting 'in place'. That means it doesn't
return the sorted value, but just sorts the sequence.

>>t = {'M':3, 'R':0, 'S':2}
>>x = t.values()
>>x.sort()
>>x

[0, 2, 3]

or you can use sorted(), which does return the sorted sequence:

>>sorted(t.valu es())

[0, 2, 3]

[raj]

Re: problem with sorting

To ankit:

Well, sort() doesn't return the sorted list. It returns None. Why not
this straightforward way?
dvals = dict.values()
dvals.sort()
print dvals

[Duncan Booth]

Re: problem with sorting

castironpi@gmai l.com wrote:

On Mar 28, 1:57ÿam, raj <rajeeshrn...@g mail.comwrote:

>To ankit:
>>
>Well, sort() doesn't return the sorted list. It returns None. Why not
>this straightforward way?
>dvals = dict.values()
>dvals.sort()
>print dvals

>
Why not sorted( dict.values() ).
>

If you are going to do it that way then it may be preferable to use
itervalues:

print sorted(dict.ite rvalues())

Both this and raj's suggestion create a single sorted list. Your suggestion
creates two lists: the unsorted one and a separate sorted one. In most
cases the difference is probably insignificant, but if you have a *lot* of
values it might make a difference.

[bearophileHUGS@lycos.com]

Re: problem with sorting

Duncan Booth:

Both this and raj's suggestion create a single sorted list. Your suggestion
creates two lists: the unsorted one and a separate sorted one. In most
cases the difference is probably insignificant, but if you have a *lot* of
values it might make a difference.

The good thing of Python 3.0 is that it forces you to do the right
thing here :-)

Bye,
bearophile