[BangPypers] list problem

[Baishampayan Ghose]

> Suppose you have the following list:
>
>>>> x =[['cat',10],['cat',20],['cat',30],['dog',5],['dog',1],['dog',3]]
>
> My problem is that i wish to obtain the following two dictionaries:
> xdictstart = {'cat':10, 'dog':1}
> xdictend = {'cat':30, 'dog':5}
>
> Any nice way to do the above? Thanks.

Don't know if this is nice, but I might want to solve this problem in
Python like this -

###
from collections import defaultdict

items = [['cat', 10], ['cat', 20], ['cat', 30], ['dog', 5], ['dog',
1], ['dog', 3]]
item_values = defaultdict(list) # this makes the values of this dict
lists by default

starts = {}
ends = {}

for k, v in items:
    item_values[k].append(v)

for k in item_values:
    starts[k] = min(item_values[k])
    ends[k] = max(item_values[k])

print starts, ends
###

Feedback appreciated.

Regards,
BG

-- 
Baishampayan Ghose
b.ghose at gmail.com