Change Python string

Question

I’m making a program to sort the numbers entered (I can’t just use a sort algorithm), searching saw that it is not possible to change strings in python, is there any way to do this? Or maybe use list instead of string?

entrada = "32415"

for i in range(entrada):
    if entrada[i] > entrada[i+1]:
        aux = entrada[i]
        entrada[i] = entrada[i+1]
        entrada[i+1] = aux

print(entrada) 

Answer 1

First of all, remember that python has much more efficient sorting algorithms already implemented in the language, simply calling a function to sort:

entrada = ''.join(sorted(entrada))

But to answer your question: yes, lists are mutable, you can convert your string into a list:

entrada = "32415"
entrada = list(entrada)

Your sorting algorithm has some problems, it seems that you are trying to use the "bubble method", however you need to return to position whenever there is change, in which case it would be better to use the while instead of for:

i = 1
while i < len(entrada):
    if entrada[i] < entrada[i-1]:
        entrada[i], entrada[i-1] = entrada[i-1], entrada[i]
        i = max(1, i - 1)
    else:
        i += 1

Then at the end you can convert the result back to string using the join:

entrada = ''.join(entrada)
print(entrada)

The result:

12345

Answer 2

Hello, all right? D
I don’t know if you are studying algorithms for sorting or want a practical Python solution, but I will follow the second option.
To sort your variable entree, a possibility could be the following:

entrada = '32415'
# Nos dois próximos comandos a string vai virar uma lista.
# Em ordem crescente.
entrada = sorted(entrada)
# Ordem decrescente.
entrada = sorted(entrada, reverse=True)
# Converter de volta para string.
entrada = ''.join(str(a) for a in entrada)

I don’t know if that’s what you want, but I hope so :D