🚀 Day 68/150 – Replace Characters in String in Python

Sometimes we need to replace characters or words inside a string.

Example:
"Python" → Replace "P" with "J" → "Jython"

Python makes this super simple using different methods 👇

🔹 Method 1 – Using  replace()

text = "Python"

result = text.replace("P", "J")

print(result)




✅ Output

Jython

📌 replace() replaces all matching characters or words in a string.

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🔹 Method 2 – Taking User Input

text = input("Enter a string: ")

old_char = input("Enter character to replace: ")
new_char = input("Enter new character: ")

result = text.replace(old_char, new_char)

print("Updated String:", result)








✅ Example Output

Enter a string: banana
Enter character to replace: a
Enter new character: o

Updated String: bonono

📌 Useful when replacement values come from the user.

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🔹 Method 3 – Using for Loop

text = "apple"

result = ""

for ch in text:
    if ch == "p":
        result += "b"
    else:
        result += ch

print(result)










✅ Output

abble

📌 This method manually checks every character and replaces matching ones.

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🔹 Method 4 – Using List Comprehension

text = "hello"

result = "".join(["*" if ch == "l" else ch for ch in text])

print(result)





✅ Output

he**o

📌 A compact and Pythonic way to replace characters.

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🔥 Key Takeaways

✅ replace() is the simplest method
✅ Loops help understand string manipulation logic
✅ List comprehension makes code shorter and cleaner
✅ String replacement is useful in text processing and cleaning
✅ Strings are immutable, so replacement creates a new string