Strings in python are immutable, so you cannot treat them as a list and assign to indices.
Use .replace() instead:
line = line.replace(';', ':')
If you need to replace only certain semicolons, you'll need to be more specific. You could use slicing to isolate the section of the string to replace in:
line = line[:10].replace(';', ':') + line[10:]
That'll replace all semi-colons in the first 10 characters of the string.
Answer from Martijn Pieters on Stack Overflow Top answer 1 of 16
349
Strings in python are immutable, so you cannot treat them as a list and assign to indices.
Use .replace() instead:
line = line.replace(';', ':')
If you need to replace only certain semicolons, you'll need to be more specific. You could use slicing to isolate the section of the string to replace in:
line = line[:10].replace(';', ':') + line[10:]
That'll replace all semi-colons in the first 10 characters of the string.
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76
You can do the below, to replace any char with a respective char at a given index, if you wish not to use .replace()
word = 'python'
index = 4
char = 'i'
word = word[:index] + char + word[index + 1:]
print word
o/p: pythin
W3Schools
w3schools.com › python › ref_string_replace.asp
Python String replace() Method
Remove List Duplicates Reverse ... Study Plan Python Interview Q&A Python Training ... The replace() method replaces a specified phrase with another specified phrase....
Python: How can I replace one specific character on a string while leaving the rest of the string as it was?
str.replace replaces all instances of the search string with the replacement string, which isn't what you want the correct solution would be to turn the string into a list, update the value at the wanted index and then "".join(char_list) to rebuild the string More on reddit.com
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October 18, 2023Str.replace of a set of characters - Ideas - Discussions on Python.org
It would mean I would not have to go to the trouble of using the re module for a common string operation. By extension, a set of multi-character strings should have any occurrences of the strings replaced, (in an indeterminate order, so watch out for replacement sets of strings were one string ... More on discuss.python.org
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December 1, 2019How to replace a character in a Python string?
Exemple: I have a string x = "hey" and I want to replace de 2nd character with "a" to turn x into "hay", is there any function that does it? obs: I'm using Python 3 More on sololearn.com
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Replace character in string
Assuming that you're only working with single characters, you can create a dictionary that associates characters with strings. Iterate through the characters, and then join the resulting iterable. def replace_chars(dct, s): return ''.join(dct.get(c, c) for c in s) In the REPL: >>> replace_chars({"A" : "BC", "B" : "CD"}, "AB") 'BCCD' (Challenge: What if you want to replace an arbitrary number of characters? That is, "AB" should be replaced with "C", but if it only finds "A", it should replace with "D") More on reddit.com
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October 31, 202101:32
Python 3 | String Replace for Beginners #coding #programming #python ...
00:58
Replace Letters In A String With Python #Coding #Python #casedigital ...
How To Replace One Character In A String In Python
13:47
Replacing a String In a String in Python - YouTube
How To Replace A Character In A String In Python #python - YouTube
GeeksforGeeks
geeksforgeeks.org › python › python-string-replace
Python String replace() Method - GeeksforGeeks
July 7, 2026 - replace() method is used to replace a specified substring with another substring in a string.
Reddit
reddit.com › r/learnprogramming › python: how can i replace one specific character on a string while leaving the rest of the string as it was?
r/learnprogramming on Reddit: Python: How can I replace one specific character on a string while leaving the rest of the string as it was?
October 18, 2023 -
word1 = input("Word: ") # lets say that the given word is "tower"
word2 = "********************"
word2 = word2.replace(word[3], word[3])
print(word2)
# Now the my code replaces all the "*" characters with the character "e"
# It just prints "eeeeeeeeeeeeeeeeeeee"
# I would like the code only to replace the 4th character with the other strings 4th
# I'd like it to print "***e****************"
Top answer 1 of 4
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str.replace replaces all instances of the search string with the replacement string, which isn't what you want the correct solution would be to turn the string into a list, update the value at the wanted index and then "".join(char_list) to rebuild the string
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You might consider using the index notation to build the new string out of substrings, something like this: str3 = str1[0:3] + str2[4] + str1[5:]
StrataScratch
stratascratch.com › blog › how-to-replace-a-character-in-a-python-string
How to Replace a Character in a Python String - StrataScratch
October 18, 2024 - The basic method for replacing a string in Python is intuitively named str.replace(). It allows you to specify one character or a whole substring you want to replace and a character (or a substring) you want to replace it with.
Python.org
discuss.python.org › ideas
Str.replace of a set of characters - Ideas - Discussions on Python.org
December 1, 2019 - I would like str.replace, when given a set of characters, to replace occurrence of any of the characters in the set. I.e. 'ASDFGH'.replace(set('SFH'), '') == 'ADG' should then hold. It would mean I would not have to go …
Server Academy
serveracademy.com › blog › python-replace-function
Python Replace() Function Blog | Server Academy
November 14, 2024 - The method in Python is a powerful tool for working with strings, allowing you to replace parts of a string with new values. Whether you’re changing characters…
Mimo
mimo.org › glossary › python › string-replace-method
Master Python's String Replace Method for Text Manipulation
You can also use replace() to replace single characters in a string rather than substrings.
FavTutor
favtutor.com › blogs › replace-character-string-python
Python Replace Character in String | FavTutor
October 6, 2021 - For this approach, you can make use of for loop to iterate through a string and find the given indexes. Later, the slicing method is used to replace the old character with the new character and get the final output.
Real Python
realpython.com › replace-string-python
How to Replace a String in Python – Real Python
October 22, 2025 - In this tutorial, you'll learn how to remove or replace a string or substring. You'll go from the basic string method .replace() all the way up to a multi-layer regex pattern using the sub() function from Python's re module.
GeeksforGeeks
geeksforgeeks.org › python › python-replace-different-characters-in-string-at-once
Python - Replace Different Characters in String at Once - GeeksforGeeks
July 15, 2025 - List comprehension iterates over ... characters back into a single string. This method uses re.sub() function from Python's re module to replace characters in a string....
GitHub
gist.github.com › Quescol › 0de90bc088f35ffc6363813718accc51
Python-string-replace-character.py · GitHub
Save Quescol/0de90bc088f35ffc6363813718accc51 to your computer and use it in GitHub Desktop. Download ZIP · Raw · Python-string-replace-character.py · This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below.
DigitalOcean
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Python String replace() | DigitalOcean
August 3, 2022 - Technical tutorials, Q&A, events — This is an inclusive place where developers can find or lend support and discover new ways to contribute to the community.
Note.nkmk.me
note.nkmk.me › home › python
Replace Strings in Python: replace(), translate(), and Regex
May 4, 2025 - To swap characters, define a mapping and apply translate(). s = 'one two one two one' print(s.translate(str.maketrans({'o': 't', 't': 'o'}))) # tne owt tne owt tne print(s.translate(str.maketrans('ot', 'to'))) # tne owt tne owt tne ...
Medium
medium.com › @ryan_forrester_ › python-string-replace-how-to-guide-ac6884add7b3
Python String Replace: How To Guide | by ryan | Medium
October 23, 2024 - Also, while `replace()` is perfect for simple string substitutions, for more complex pattern matching and replacement, look into Python’s `re` module, which offers more advanced text processing capabilities through regular expressions.
Pierian Training
pieriantraining.com › home › python tutorial: replace character in a string
Python Tutorial: Replace Character in a String - Pierian Training
April 27, 2023 - In this example, the old value is a space character (`’ ‘`), and the new value is an underscore (`’_’`). The `replace()` function returns a new string (`’Hello_World!’`) with the space replaced by an underscore. Overall, understanding how to work with strings in Python is essential for any programmer who wants to manipulate textual data.
Spark By {Examples}
sparkbyexamples.com › home › python › python replace character in string
Python Replace Character in String - Spark By {Examples}
May 21, 2024 - How to replace a character in a string in Python? To replace a character in a string using Python, you can utilize the str.replace() method. This method
Facebook
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Strings in Python Explained For Beginners #python
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Top answer 1 of 3
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ECMAScript. ECMAScript (or ES) is a trademarked scripting-language specification standardized by Ecma International in ECMA-262 and ISO/IEC 16262. It was created to standardize JavaScript, so as to foster multipleindependent implementations
https://codeburst.io/javascript-wtf-is-es6-es8-es-2017-ecmascript-dca859e4821c
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ECMAScript is a general-purpose programming language, standardized by Ecma International according to the document ECMA-262. It is a JavaScript standard meant to ensure the interoperability of Web pages across different Web browsers.
*The full form of ECMA is European Computer Manufacturer's Association.
*ECMAScript 6 or ES6 is also known as ECMAScript 2015.
*Somepeople call it as JavaScript6.
Type of format: Scripting language
Typing discipline: weak, dynamic
Designed by: Brendan Eich, Ecma International
Hope, It will help you!
Quora
quora.com › How-do-you-replace-the-first-two-characters-of-a-string-in-Python
How to replace the first two characters of a string in Python - Quora
Answer (1 of 3): String are immutable in python.Either we can create another string or convert the into a character list. For ex. a = ‘abcdef' b = a[1]+a[0]+a[2:] c = list(a) c[0], c[1]=c[1], c[0]