CODEWITHSUNDEEP
pythonlistoptimizationcoding-style
Gianni Spear
Gianni Spear

Reputation: 7924

Select maximum value in a list and the attributes related with that value

I am looking for a way to select the major value in a list of numbers in order to get the attributes.

data
[(14549.020163184512, 58.9615170298556),
 (18235.00848249135, 39.73350448334156),
 (12577.353023695543, 37.6940001866714)]

I wish to extract (18235.00848249135, 39.73350448334156) in order to have 39.73350448334156. The previous list (data) is derived from a a empty list data=[]. Is it the list the best format to store data in a loop?

Upvotes: 0

Views: 701

Answers (4)

pranshus
pranshus

Reputation: 187

You can actually sort on any attribute of the list. You can use itemgetter. Another way to sort would be to use a definitive compare functions (when you might need multiple levels of itemgetter, so the below code is more readable).

dist = ((1, {'a':1}), (7, {'a': 99}), (-1, {'a':99}))

def my_cmp(x, y):
    tmp = cmp(x[1][a], y[1][a])
    if tmp==0:
        return (-1 * cmp(x[0], y[0]))
    else: return tmp

sorted = dist.sort(cmp=my_cmp) # sorts first descending on attr "a" of the second item, then sorts ascending on first item

Upvotes: 1

Alexander Koshkin
Alexander Koshkin

Reputation: 129

Hmm, it seems easy or what?) max(a)[1] ?

Upvotes: 2

eumiro
eumiro

Reputation: 212835

max(data)[1]

Sorting a tuple sorts according to the first elements, then the second. It means max(data) sorts according to the first element.

[1] returns then the second element from the "maximal" object.

Upvotes: 2

Faruk Sahin
Faruk Sahin

Reputation: 8726

You can get it by :

max(data)[1]

since tuples will be compared by the first element by default.

Upvotes: 3

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