Solved

Change one character in a string. Easiest way

Posted on 2009-05-05
2
848 Views
Last Modified: 2012-05-06
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?
0
Comment
Question by:dfernan
2 Comments
 
LVL 39

Expert Comment

by:Roger Baklund
ID: 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'

Open in new window

0
 
LVL 2

Accepted Solution

by:
jdevera earned 250 total points
ID: 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')

Open in new window

0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Flask is a microframework for Python based on Werkzeug and Jinja 2. This requires you to have a good understanding of Python 2.7. Lets install Flask! To install Flask you can use a python repository for libraries tool called pip. Download this f…
The purpose of this article is to demonstrate how we can upgrade Python from version 2.7.6 to Python 2.7.10 on the Linux Mint operating system. I am using an Oracle Virtual Box where I have installed Linux Mint operating system version 17.2. Once yo…
Learn the basics of strings in Python: declaration, operations, indices, and slicing. Strings are declared with quotations; for example: s = "string": Strings are immutable.: Strings may be concatenated or multiplied using the addition and multiplic…
Learn the basics of modules and packages in Python. Every Python file is a module, ending in the suffix: .py: Modules are a collection of functions and variables.: Packages are a collection of modules.: Module functions and variables are accessed us…

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question