2019-10-05 a minute read (About 181 words)

python_sort

Python sorting

sorted() : returns a new list
list.sort() : modifies the list in-place and only defined for list

Let’s look at some example :

using sorted()

1
2
3

example = [7,4,3,1,2]
sorted(example)
print(example)

example not ordered after calling sorted:
output : 7, 4, 3, 1, 2

1 2	after_sort = sorted(example) print(after_sort)

assign to new list after_sort
output : 1, 2, 3, 4, 7

using list.sort()

1	example.sort()

output is sorted : 1, 2, 3, 4, 7

using itemgetter()

from operator import itemgetter
student = [["D",10],["C",10],["B",10],["A",10],["G",4]]
student.sort(key=itemgetter(1,0))
print(student)

first order by number (itemgetter(1))
then order by alphabet ( itemgetter(0))
output : [[‘G’, 4], [‘A’, 10], [‘B’, 10], [‘C’, 10], [‘D’, 10]]

hackerrank :

from operator import itemgetter
store_stu = []
min = 1000
if __name__ == '__main__':
    for _ in range(int(input())):
        name = input()
        score = float(input())
        if score < min:
            min = score
        store_stu.append([name,score] )
    store_stu = sorted(store_stu, key = itemgetter(1,0) )
    flag_small = 0
    for i,j in store_stu:
        if j > min and flag_small==0:
            flag_small = j
    if flag_small == 0:
        flag_small = min
    for i,j in store_stu:
        if j == flag_small:
            print(i)

python_sort

Python sorting

Let’s look at some example :

using sorted()

using list.sort()

using itemgetter()

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