Use integer operator on string from index

Question

In this code here

x = '123'

How can I addition let's say 5 to the second index. So x would be '173'.

does this answer your question? https://stackoverflow.com/a/22149018 — Ecto, Jun 17 '20 at 22:37
Yes, yes it does. I thought I was the only person that had this question, I guess it has already been answered. — aaa, Jun 17 '20 at 22:39

score 2 · Accepted Answer · answered Jun 17 '20 at 22:37

2

x = '123'
n = 5

result = x[:1] + str(int(x[1]) + n) + x[2:]
print(result)

Prints:

For n=9:

answered Jun 17 '20 at 22:37

Andrej Kesely

cs1349459 · Answer 2 · 2020-06-17T22:42:00.367

0

Split it into a list, try to turn them into ints or floats, and do your math.

x = "123"
x = list(x)

for i in range(0, len(x)):
    try:
        x[i] = int(x[i])
    except:
        x[i] = x[i]

x[1] += 5
print(x)

It returns [1.0, 7.0, 3.0].

edited Jun 17 '20 at 22:42

answered Jun 17 '20 at 22:39

cs1349459

Why floats instead of ints? – wjandrea Jun 17 '20 at 22:40
@wjandrea oh. I was trying to prevent errors, but that didn't work. – cs1349459 Jun 17 '20 at 22:41

score 0 · Answer 3 · answered Jun 17 '20 at 22:45

Split the string into a list, modify the element at the desired index, then join the list back into a string.

x = '123'
i = 1
n = 5

y = list(x)
y[i] = str(int(y[i]) + n)
print(''.join(y))  # -> 173

3 Answers3