list + dictionary searching

[Manoj]

Hello All,

I am very new to python. Any help will be highly appreciated. Thanks

I have a list of dictionaries:

a = [{'username': u'John Wang', 'user_utilizati on': 1.0, 'month': 9,
'user_id': 4, 'year': 2008}, {'username': u'John Wang',
'user_utilizati on': 1.0, 'month': 10, 'user_id': 4, 'year': 2008},
{'username': u' ', 'user_utilizati on': 1.0, 'month': 9, 'user_id': 1,
'year': 2008}]

I would like to :

search dictionaries within this list
create a new list with dictionaries which gives 1 dictionary for every
user with month_year as a key and utilization for that month as a
value

Please give your thoughts

Thanks,
Manoj

[Bruno Desthuilliers]

Re: list + dictionary searching

Manoj a écrit :

Hello All,
>
I am very new to python. Any help will be highly appreciated. Thanks
>
I have a list of dictionaries:
>
a = [{'username': u'John Wang', 'user_utilizati on': 1.0, 'month': 9,
'user_id': 4, 'year': 2008}, {'username': u'John Wang',
'user_utilizati on': 1.0, 'month': 10, 'user_id': 4, 'year': 2008},
{'username': u' ', 'user_utilizati on': 1.0, 'month': 9, 'user_id': 1,
'year': 2008}]
>
I would like to :
>
search dictionaries within this list

Care to elaborate ???

create a new list with dictionaries which gives 1 dictionary for every
user with month_year as a key and utilization for that month as a
value

assuming the user_id/month/year combination is unique:

from collections import defaultdict
users = defaultdict(dic t)

for record in a:
month_year = "%(month)s_%(ye ar)s" % record
users[record['user_id']][month_year] = record['user_utilizati on']

print users.values()

HTH

[Wojtek Walczak]

Re: list + dictionary searching

On Mon, 1 Sep 2008 03:14:22 -0700 (PDT), Manoj wrote:

I would like to :
>
search dictionaries within this list
create a new list with dictionaries which gives 1 dictionary for every
user with month_year as a key and utilization for that month as a
value
>
Please give your thoughts

Reading about for loop seems like a good idea. You can easily
create a set of functions that gives you direct access to the
information you need.

http://docs.python.org/tut/node6.html#SECTION006200000000000000000

http://docs.python.org/tut/node7.html#SECTION007500000000000000000

Give it a try. Try to design some functions that let you
view and add new lists/dictionaries to your variables.

--
Regards,
Wojtek Walczak,

http://tosh.pl/gminick/