dictionary - creating nested dictionaries in python from database query -

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i have information i'm retrieving database:

with fields like

|portfolio| date | sector| industry | ticker | price | postion|

and data like

("us", "2013-01", "consumer","retail","pm",10,1000) ("us", "2013-01", "consumer", "retail", "jcp", 15, 1500) ...

how can turn dictionary looks like:

{us:{"2013-01":{"consumer":{"retail":{"pm":{"price":10,"position":1000},"jcp":{"price":15, "position":1500}}}}}}

in time , resource effective way?

something 

a[date][sector][industry][ticker].update("pm2" = dict(close=10, position = 1000))

gives me error.

thanks

you havent specified error.

anyways, can done iterating each row , using setdefault method dict, can check item , see if present in dict.

so, example - 

a = {} a.setdefault('us', {}) .... .... # if  # {'us':{"2013-01":{"consumer":{"retail":{"pm":{"price":10,"position":1000}}}}}} # , iterating on 2nd row a['us']['2013-01']['consumer']['retail'].setupdate('jcp', {}) .....

you may want write function that. idea on how better approach can written.


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