IMO there might be a problem with the way you are using replace. The syntax for replace is explained. here
string.replace(s, old, new[, maxreplace])
This ipython session might be able to help you.
In [1]: mystring = "whatever"
In [2]: mystring.replace('er', 'u')
Out[2]: 'whatevu'
In [3]: mystring
Out[3]: 'whatever'
basically the pattern you want replaced comes first, followed by the string you want to replace with.
Answer from Anuvrat Parashar on Stack Overflow Top answer 1 of 5
2
IMO there might be a problem with the way you are using replace. The syntax for replace is explained. here
string.replace(s, old, new[, maxreplace])
This ipython session might be able to help you.
In [1]: mystring = "whatever"
In [2]: mystring.replace('er', 'u')
Out[2]: 'whatevu'
In [3]: mystring
Out[3]: 'whatever'
basically the pattern you want replaced comes first, followed by the string you want to replace with.
2 of 5
0
String is inmutable, so u can't replace only the 2 last letters... you must create a new string from the existant.
and as said by MM-BB, replace will replace all the ocurance of the letter...
try
word = raw_input("what words do you want to turn into past tense?")
word2 = word
if word2.endswith("re"):
word3 = word2[:-2] + 'u'
print word3
elif word2.endswith("ir"):
word3 = word2[:-2] + "i"
print word3
elif word2.endswith("er"):
word3 = word2[:-2] + "e"
print word3
else:
print "nope"
ex 1 :
what words do you want to turn into past tense?sentir
senti
ex 2 :
what words do you want to turn into past tense?manger
mange
W3Schools
w3schools.com › python › ref_string_replace.asp
Python String replace() Method
Remove List Duplicates Reverse ... Interview Q&A Python Bootcamp 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?
On July 1st, a change to Reddit's API pricing will come into effect. Several developers of commercial third-party apps have announced that this change will compel them to shut down their apps. At least one accessibility-focused non-commercial third party app will continue to be available free of charge. If you want to express your strong disagreement with the API pricing change or with Reddit's response to the backlash, you may want to consider the following options: Limiting your involvement with Reddit, or Temporarily refraining from using Reddit Cancelling your subscription of Reddit Premium as a way to voice your protest. I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns. More on reddit.com
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October 18, 2023Python - Replacing letters in a string? - Stack Overflow
I am basically writing a simple function in which the user enters a sentence (strng), a letter (letter) and another letter (replace) to replace the first letter with. Here's what I have: def More on stackoverflow.com
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
17
2
October 31, 2021How to replace a string that is all the same character at a specific index?
Slice and concatenate. string1 = string1[:-1] + 'b' More on reddit.com
10
10
May 4, 2024How To Replace Letters In A String In Python
How To Replace One Character In A String In Python
13:47
Replacing a String In a String in Python - YouTube
00:58
Replace Letters In A String With Python #Coding #Python #casedigital ...
01:32
Python 3 | String Replace for Beginners #coding #programming #python ...
03:52
Python Replace String Method
Real Python
realpython.com › replace-string-python
How to Replace a String in Python – Real Python
January 15, 2025 - ... To remove part of a string, you can use the .replace() method, specifying the part you want to remove and using an empty string as the replacement. ... You replace a letter in a string by using the .replace() method, where the first argument is the letter you want to replace, and the second argument is the new letter you want to use...
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
13
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
2 of 4
13
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:]
Flexiple
flexiple.com › python › python-replace-character-in-string
Python string.replace() – How to Replace a Character in a String - Flexiple - Flexiple
March 11, 2022 - The Python string.replace() method is a powerful tool for modifying strings by replacing a character, or sequence of characters, with a new character or sequence. This function is part of Python's string class, allowing developers to easily ...
freeCodeCamp
freecodecamp.org › news › python-string-replace-how-to-replace-a-character-in-a-string
Python string.replace() – How to Replace a Character in a String
September 1, 2022 - Here's an example that replaces "JavaScript" with "PHP" in a string: str = "I love JavaScript. I prefer JavaScript to Python because JavaScript looks more beautiful" new_str = str.replace("JavaScript", "PHP") print(new_str) # I love PHP.
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.
PyTutorial
pytutorial.com › replace-letter-in-string-python-guide
PyTutorial | Replace Letter in String Python Guide
February 18, 2026 - Start with replace() for basic needs. Move to translate() for multiple changes. Use regex only when you need pattern matching. Mastering these methods will make you proficient at string manipulation in Python. For related operations like mapping alphabets to numeric values, techniques from a Python Letter to Number Conversion Guide can be very complementary.
Quora
quora.com › Whats-the-quickest-way-to-replace-a-letter-in-a-string-in-Python
What's the quickest way to replace a letter in a string in Python? - Quora
Answer: You can’t actually change a letter in a string, a string in Python is immutable, but you can create a new string based in the original : if you want to replace all examples of a letter with another, then thr best way is to use the replace method. [code]>>> orig = ‘The_rain_in_spain’ ...
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
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 - Replacing characters in a string with a list comprehension? That sounds awkward! Actually, it isn’t because it’s one of the three steps required in total: ... To convert a string to a list, use the split() method with this generic syntax. string_variable = 'your string here' list_of_words = string_variable.split() Now, list comprehension. It’s a Python method of creating a new list by applying an expression to each item in a list.
PyTutorial
pytutorial.com › replace-letter-in-string-python-easy-guide
PyTutorial | Replace Letter in String Python | Easy Guide
February 18, 2026 - Here is the basic syntax for the replace() method. # Syntax: string.replace(old, new, count) # old: The substring to find. # new: The substring to replace it with. # count (optional): How many occurrences to replace.
iO Flood
ioflood.com › blog › using-python-to-replace-characters-in-a-string
Using Python to Replace Characters in a String
November 23, 2023 - As you can see, the replace() method has replaced ‘a’ with ‘b’, resulting in the new string “bpple”. For more advanced methods, tips, and tricks, read on. ... Python offers an in-built method for replacing characters in a string: the replace() function.
Top answer 1 of 4
6
strings are immutable, you need to assign it to a new variable and return that. replace() returns a new string and does not change it in place.
>>> def letter_replace(strng, letter, replace):
replace = str(replace)
for char in strng:
if char == letter.upper() or char == letter.lower():
strng = strng.replace(char, replace)
return strng # Or just do return strng.replace(char, replace)
else:
return "Sorry, the letter could not be replaced."
>>> letter_replace('abc', 'a', 'f')
'fbc'
2 of 4
3
strng.replace(char, replace)
This does the replacement, creating a new string, and then throws away the changed string because you don't assign it to a variable.
Since you're just going to return it anyway, you can simply write:
return strng.replace(char, replace)
Mimo
mimo.org › tutorials › python › how-to-replace-characters-in-a-string-in-python
How to Replace Characters in a String in Python
Replace characters in Python strings with replace() or translate(), including limits and multi-character swaps.
Scaler
scaler.com › home › topics › replace a character in a string python
Replace a Character in a String Python - Scaler Topics
April 20, 2024 - The .replace() method replaces the old character with a new character. We can also use loops to replace a character in a string in Python. The string slicing method can also be used to replace a string in python.
CodeGenes
codegenes.net › blog › how-to-replace-a-letter-in-a-string-python
How to Replace a Letter in a String in Python — codegenes.net
If you are working with very large strings and need to perform multiple replacements, using a loop or list comprehension might be more memory-efficient as it allows you to process the string in chunks. When performing replacements, make sure to handle potential encoding issues. If you are working with non-ASCII characters, ensure that your code is using the correct encoding. In Python, there are multiple ways to replace a letter in a string.
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, we first define a string called `sentence`. We then use the replace() method to replace all occurrences of the letter “o” with the number “0”. The resulting string is stored in a new variable called `new_sentence`. Finally, ...
GeeksforGeeks
geeksforgeeks.org › python › python-replace-different-characters-in-string-at-once
Python - Replace Different Characters in String at Once - GeeksforGeeks
July 15, 2025 - This method iterates over a small mapping dictionary, using str.replace() to replace characters in the string based on the dictionary.
Replit
replit.com › home › discover › how to replace a character in a string in python
How to replace a character in a string in Python | Replit
February 6, 2026 - The map() function provides a functional programming approach. It’s a clean way to apply a single operation to every item in a sequence, like the characters in a string. First, you define a function—in this case, replace_vowels—that contains the replacement logic for a single character.