Can't change a python string

Question

My mission is to get a string from a user, and then:

Change every A character in the list to digit 1 ("1").
Change every B character in the list to digit 2 ("2").
Change every C character in the list to digit 3 ("3").

That's what I've done until now:

string = input("Enter a string: ")
for i in range(len(string) - 1):
    if string[i] == "A":
        string[i] = "1"
    elif string[i] == "B":
        string[i] = "2"
    elif string[i] == "C":
        string[i] = "3"

But when I run it, the interpreter gives me this error:

line 4, in string[i] = "1" TypeError: 'str' object does not support item assignment

Does someone know how to make my code work?

Is there a way to do it without ```replace()```? because I didn't learn it... — DaNiEl, Jul 03 '21 at 07:23
Try `string = string[:i] + 'A' + string[i+1:]`. And change the range to `(len(string))` — Timus, Jul 03 '21 at 07:31
Strings in Python are immutable. You need to create a new string if you want to make any changes to an existing string. To solve your problem idiomatically in Python: `string = input("Enter a string: "); table = str.maketrans("ABC", "123"); print(string.translate(table))` — Fractal, Jul 03 '21 at 07:56

score 0 · Accepted Answer · answered Jul 03 '21 at 07:23

You can use that

user_row = input("Enter a string: ")
final_row = ''
for i in range(0, len(user_row)):
    if user_row[i] == "A":
        final_row += "1"
    elif user_row[i] == "B":
        final_row += "2"
    elif user_row[i] == "C":
        final_row += "3"
    else:
        final_row += user_row[i]
print(final_row)

Also

user_row = input("Enter a string: ")
user_row = user_row.replace('A', '1').replace('B', '2').replace('C', '3')
print(user_row)

score 0 · Answer 2 · answered Jul 03 '21 at 07:27

0

Strings are immutable.Insted of that do this:

user=input()
user=user.replace('A',1).replace('B',2).replace('C',3)

Here replace replaces all the occurrence of a with 1 and etc

answered Jul 03 '21 at 07:27

EpicPy

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Can't change a python string

2 Answers2