Question

Change one character in a string. Easiest way

Asked by: dfernan

Hi,

I have this list:

list = ['hellolotomao', 4]

want to change list[0][-1] (which now equals 'o')  to 'Z'

if i do,
list[0][-1] = 'Z'
'str' object does not support assignment???

any easy way to do this?

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Asked On
2009-05-05 at 18:13:46ID24383441
Tags

python

,

string

Topic

Python Scripting Language

Participating Experts
2
Points
250
Comments
2

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Answers

 

by: cxrPosted on 2009-05-05 at 18:35:04ID: 24310695

Strings are "immutable", which means they can not be changed inplace. You must replace the string with the new version of the string.

list[0] = list[0][:-1]+'Z'

                                              
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by: jdeveraPosted on 2009-05-06 at 01:44:23ID: 24312308

You can also use a more generic function for this. But always bear in mind that, as cxr explained, you are not actually changing the same string you had, you are creating a new one.

def change_char(string, index, character):
    if index == -1:
        return string[:index] + character
    else:
        return string[:index] + character + string[index+1:]
 
# some tests:
s="abcdef"
print change_char(s, -1, 'x')
# abcdex
print change_char(s, -2, 'y')
# abcdyf
print change_char(s,  1, 'z')
# azcdef
 
# So you can do:
list[0] = change_char(list[0], -1, 'Z')
                                              
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