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Superdooperhero
Superdooperhero

Reputation: 8096

How to sort the letters in a string alphabetically in Python

Is there an easy way to sort the letters in a string alphabetically in Python?

So for:

a = 'ZENOVW'

I would like to return:

'ENOVWZ'

Upvotes: 238

Views: 515303

Answers (7)

Saquib
Saquib

Reputation: 271

You can use functools.reduce

>>> from functools import reduce
>>> a = 'ZENOVW'
>>> reduce(lambda x,y: x+y, sorted(a))
'ENOVWZ'

Upvotes: 10

askewchan
askewchan

Reputation: 46530

>>> a = 'ZENOVW'
>>> b = sorted(a)
>>> print(b)
['E', 'N', 'O', 'V', 'W', 'Z']

sorted returns a list, so you can make it a string again using join:

>>> c = ''.join(b)

which joins the items of b together with an empty string '' in between each item.

>>> print(c)
'ENOVWZ'

Upvotes: 118

Priyank Arora
Priyank Arora

Reputation: 505

Python functionsorted returns ASCII based result for string.

INCORRECT: In the example below, e and d is behind H and W due it's to ASCII value.

>>>a = "Hello World!"
>>>"".join(sorted(a))
' !!HWdellloor'

CORRECT: In order to write the sorted string without changing the case of letter. Use the code:

>>> a = "Hello World!"
>>> "".join(sorted(a,key=lambda x:x.lower()))
' !deHllloorW'

OR (Ref: https://docs.python.org/3/library/functions.html#sorted)

>>> a = "Hello World!"
>>> "".join(sorted(a,key=str.lower))
' !deHllloorW'

If you want to remove all punctuation and numbers. Use the code:

>>> a = "Hello World!"
>>> "".join(filter(lambda x:x.isalpha(), sorted(a,key=lambda x:x.lower())))
'deHllloorW'

Upvotes: 13

Mono
Mono

Reputation: 144

Really liked the answer with the reduce() function. Here's another way to sort the string using accumulate().

from itertools import accumulate
s = 'mississippi'
print(tuple(accumulate(sorted(s)))[-1])

sorted(s) -> ['i', 'i', 'i', 'i', 'm', 'p', 'p', 's', 's', 's', 's']

tuple(accumulate(sorted(s)) -> ('i', 'ii', 'iii', 'iiii', 'iiiim', 'iiiimp', 'iiiimpp', 'iiiimpps', 'iiiimppss', 'iiiimppsss', 'iiiimppssss')

We are selecting the last index (-1) of the tuple

Upvotes: 0

Kanan Joshi
Kanan Joshi

Reputation: 137

the code can be used to sort string in alphabetical order without using any inbuilt function of python

k = input("Enter any string again ")

li = []
x = len(k)
for i in range (0,x):
    li.append(k[i])

print("List is : ",li)


for i in range(0,x):
    for j in range(0,x):
        if li[i]<li[j]:
            temp = li[i]
            li[i]=li[j]
            li[j]=temp
j=""

for i in range(0,x):
    j = j+li[i]

print("After sorting String is : ",j)

Upvotes: 1

Radek
Radek

Reputation: 1630

Sorted() solution can give you some unexpected results with other strings.

List of other solutions:

Sort letters and make them distinct:

>>> s = "Bubble Bobble"
>>> ''.join(sorted(set(s.lower())))
' belou'

Sort letters and make them distinct while keeping caps:

>>> s = "Bubble Bobble"
>>> ''.join(sorted(set(s)))
' Bbelou'

Sort letters and keep duplicates:

>>> s = "Bubble Bobble"
>>> ''.join(sorted(s))
' BBbbbbeellou'

If you want to get rid of the space in the result, add strip() function in any of those mentioned cases:

>>> s = "Bubble Bobble"
>>> ''.join(sorted(set(s.lower()))).strip()
'belou'

Upvotes: 42

K Z
K Z

Reputation: 30453

You can do:

>>> a = 'ZENOVW'
>>> ''.join(sorted(a))
'ENOVWZ'

Upvotes: 400

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