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Python sorting by three criteria


By : Muhammad Osama
Date : October 17 2020, 01:08 AM
With these it helps I'm trying to get a handle on sorting by several criteria (length, suffix and alphabetically in that order). I can't quite get a grip on it though, and all I seem to be able to do is sort by length... , You can specify multiple sort keys as a tuple:
code :
sortme.sort(key=lambda item: (item.split('.')[1], len(item), item), reverse=False)

print("\n".join(sortme))
one.ab
ten.ab
three.ab
six.ef
two.ef
Four.ef
eight.ef
seven.jk
five.xy
nine.xy


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Python sorting by multiple criteria


By : Yarin Alfassi
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have a list where each element is of the form [list of integers, integer]. For example, an element of the list may look like this [[1,3,1,2], -1]. , List the three criteria in your key:
code :
sorted(inputlist, key=lambda e: (len(e[0]), e[0], e[1]))

python sorting objects in a list using to criteria


By : P.Bhagat
Date : March 29 2020, 07:55 AM
it fixes the issue I have a list of objects that have two attributes first_name and last_name. I want to be able to sort the names first by the last_name and then by first_name. , You need to sort just once and return a tuple:
code :
search_result.sort(key=lambda x: (x.last_name, x.first_name))
from operator import attrgetter

search_result.sort(key=attrgetter('last_name', 'first_name'))
>>> from collections import namedtuple
>>> Person = namedtuple('Person', 'first_name last_name')
>>> search_result = [Person('John', 'James'), Person('Andrew', 'James'), Person('Nigel', 'Reynolds'), Person('Nikos', 'Galis')]
>>> search_result.sort(key=lambda x: (x.last_name, x.first_name))
>>> from pprint import pprint
>>> pprint(search_result)
[Person(first_name='Nikos', last_name='Galis'),
 Person(first_name='Andrew', last_name='James'),
 Person(first_name='John', last_name='James'),
 Person(first_name='Nigel', last_name='Reynolds')]
>>> import random
>>> from operator import attrgetter
>>> random.shuffle(search_result)
>>> search_result.sort(key=attrgetter('last_name', 'first_name'))
>>> pprint(search_result)
[Person(first_name='Nikos', last_name='Galis'),
 Person(first_name='Andrew', last_name='James'),
 Person(first_name='John', last_name='James'),
 Person(first_name='Nigel', last_name='Reynolds')]

Sorting by any number of criteria in Python


By : Eden Ding
Date : March 29 2020, 07:55 AM
may help you . Say I have a table of data, and I want to be able to return data from the table sorted by some criteria (like SQL). The problem is, I don't know how many things I need to order by, and the ORDER BY command could be followed by just one column name, or two, or 100. , A simple way would be similar to what you already have:
code :
s = sorted(s, key = lambda x: [x[i] for i in orderings])

Multi-Dimesnion Array sorting, Udating database until criteria meet then moving to next criteria


By : Jhay
Date : March 29 2020, 07:55 AM
I wish this help you I have a php (5.3) file that sets a Multi-Dimensional Array , SO here is what i ended up doing
code :
while ($qtyDistribute>0){
     $prices = array(
                  'a' => $Price2,
                  'ab' => $NPrice2,
                  'c'=>$BW2,
                  'd'=>$BWU2,
                  'e'=>$BKB2,
                  'f'=>$Price2,
                  'g'=>$FNew2
                  );
if ($bestGuide=='ab'){
    if($abMargin>0){
        if($qtyDistribute<=10){
            $abQty=$qtyDistribute;
            $qtyDistribute=0;
        }
        else if ($qtyDistribute>10){
            $abQty=10;
            $qtyDistribute=($qtyDistribute-10);
            $NPrice2=0;             
        }
    }
     else{
        $qtyDistribute=0;

    }
}

Sorting a List of Lists with multiple criteria (Python)


By : Andrey Olishchuk
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Here's a basic bubble sort:
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