Hướng dẫn sort string python alphabetical

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Given a string of letters, write a python program to sort the given string in an alphabetical order.

Example:

Input : PYTHON
Output : HNOPTY

Input : Geeks
Output : eeGks

Naive Method to sort letters of string alphabetically

Here we are converting the string into list and then finally sorting the entire list alphabet wise.

Python3

s ="GEEKSFORGEEKS"

li = []

l = len(s)

for i in range (0,l):

    li.append(s[i])

for i in range(0,l):

    for j in range(0,l):

        if li[i]

            li[i],li[j]=li[j],li[i]

j=""

for i in range(0,l):

    j = j+li[i]

print(j)

Output:

EEEEFGGKKORSS

Using sorted() with join() to sort letters of string alphabetically

Here we are converting the string into a sorted list and then finally joining them using join function.

Python3

def sortString(str):

    return ''.join(sorted(str))

str = 'PYTHON'

print(sortString(str))

Output:

HNOPTY

Using sorted() with accumulate() to sort letters of string alphabetically

Here we are importing accumulate from itertools module converting the string into a sorted list, and hence return the result

Python3

from itertools import accumulate

def sortString(str):

    return tuple(accumulate(sorted(str)))[-1]

str = 'PYTHON'

print(sortString(str))

Output:

HNOPTY

Using sorted() with reduce() to sort letters of string alphabetically

Another alternative is to use reduce() method. It applies a join function on the sorted list using ‘+’ operator. 

Python3

from functools import reduce

def sortString(str):

    return reduce(lambda a, b : a + b, sorted(str))

str = 'PYTHON'

print(sortString(str))

Output:

HNOPTY

When string is in different cases –

Using sorted() with join() to sort letters of string alphabetically

Here we are converting the string into a sorted list and then finally joining them using the lambda functions.

Python3

from itertools import accumulate

def sortString(str):

    return "".join(sorted(str, key = lambda x:x.lower()))

str = 'Geeks'

print(sortString(str))

eeGks