reorder digits of an integer

Question

Suppose I have an integer (say 235) and I want to reorder this number in all possible ways and get all other integers in a list or tuple. Is there a way to do it in python? The desired output will consist of: [235, 253, 325, 352, 523, 532]

And any other if I missed some.

I wanna create a list tuple or any other thing of all these values from where I can use these values somewhere else.

Does this answer your question? [Turn a single number into single digits Python](https://stackoverflow.com/questions/21270320/turn-a-single-number-into-single-digits-python) — wondercoll, Feb 01 '20 at 17:55
I would suggest turning the number into a string and using itertools permutations. — jawsem, Feb 01 '20 at 17:56

score 4 · Answer 1 · answered Feb 01 '20 at 18:02

4

Convert number into list of string numbers then do permutations.

import itertools
number = 235
results = [int("".join(x)) for x in list(itertools.permutations(list(str(number))))]

Output:

[235, 253, 325, 352, 523, 532]

answered Feb 01 '20 at 18:02

Zaraki Kenpachi

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Don't you think one-liners are not good for maintenance purposes? I learned here that one-liners are not good. :) – LordOfThunder Feb 01 '20 at 18:16

Alexander · Answer 2 · 2020-02-01T18:04:42.300

Convert the number to a string, then use a list comprehension to extract each digit as a character. This gives you the list of digit strings, e.g. ['2', '3', '5'].

Use permutations to get the different arrangements, joining the result and converting them back to integers.

from itertools import permutations

integer = 235
numbers = [i for i in str(integer)]  # ['2', '3', '5']

>>> list(int(''.join(p)) for p in permutations(numbers))
[235, 253, 325, 352, 523, 532]

# Or just simply (no need for `numbers`):
# list(int(''.join(p)) for p in permutations(str(integer)))

score 0 · Answer 3 · 2020-02-03T23:18:24.030

0

You can use itertools.permutations:

import itertools
list(map(int,map("".join,itertools.permutations("235"))))

https://docs.python.org/3.5/library/itertools.html#itertools.permutations

edited Feb 03 '20 at 23:18

answered Feb 01 '20 at 18:01

LordOfThunder · Accepted Answer · 2020-02-01T18:10:09.000

Use itertools.permutation, one-liners are good to show that you know python very well, but what actually matters is the maintainability. Here is a maintainable code, where every function is doing a single work and after reading the code we can get the logic(wherein the case of a one-liner, we need to spend time understanding the code):

from itertools import permutations as perm

def to_int(p):
    return int(''.join(map(str, p)))

def all_perms(n):
    digits = list(map(int, str(n)))
    perms = []
    for p in perm(digits, len(digits)):
        perms.append(to_int(p))
    return perms

n = 235
print(all_perms(n))

reorder digits of an integer

4 Answers4