On 07/22/2010 03:21 PM, Vikram wrote:
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}
I don't get it, what's the criteria for creating xdictstart and xdictend ? Is
start the lowest value of element 1 for each element 0 and xdictend the highest ?
If it is:
>>> x =[['cat',10],['cat',20],['cat',30],['dog',5],['dog',1],['dog',3]]
>>> d = {}
>>> for k, v in x:
... d.setdefault(k, []).append(v)
...
>>> d
{'dog': [5, 1, 3], 'cat': [10, 20, 30]}
>>> xstartdict = {}
>>> xenddict = {}
>>> for k, v in d.items():
... xstartdict[k] = min(v)
... xenddict[k] = max(v)
...
>>> xstartdict, xenddict
({'dog': 1, 'cat': 10}, {'dog': 5, 'cat': 30})
>>>
cheers,
- steve
--
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