Python Strings Manipulation: Replace, Join, Split, Reverse, Uppercase & Lowercase Explained Great 2025

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👉Tutorial-7: Python String Split() Function
👉Tutorial-8:  Reverse a String in Python

Python Strings: Replace, Join, Split, Reverse, Uppercase & Lowercase

Python Strings: In Python, strings are objects that can be easily manipulated using various built-in methods. Python strings can be Python Strings created simply by enclosing text within double quotes. For example:

python

var = “Hello World!”

Python Strings Accessing Values in Strings

Python doesn’t have a dedicated character type; instead, characters are treated as strings of length one. You can access specific characters using square brackets.

Example Code:

python

var1 = “Software Moji Moji!”

var2 = “Software Testing”

print(“var1[0]:”, var1[0])  # Output: S

print(“var2[1:5]:”, var2[1:5])  # Output: oftw

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Various String Operators in Python

Python provides multiple operators to perform string manipulations.

Operator	Description	Example
[]	Slice a string to retrieve a character by index	x[1] → “o”
[ : ]	Range slice to retrieve characters within a specified range	x[1:3] → “of”
in	Membership operator to check if a substring exists in a string	“Moji” in x → True
not in	Membership operator to check if a substring does not exist in a string	“Test” not in x → True
+	Concatenates two strings	“Python” + ” Moji” → “Python Moji”
*	Repeats the string specified number of times	“Python”*2 → “PythonPython”

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Python String Methods with Examples

1. Python replace() Method

The replace() method returns a copy of the string with specified values replaced.

Example Code:

python

oldstring = ‘I like Python Programming’

newstring = oldstring.replace(‘like’, ‘love’)

print(newstring)

Output:

I love Python Programming

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2. Changing Uppercase and Lowercase

• upper() – Converts all characters to uppercase.
• lower() – Converts all characters to lowercase.
• capitalize() – Capitalizes the first character.

Example Code:

python

string = “python at software moji”

print(string.upper())        # Output: PYTHON AT SOFTWARE MOJI

print(string.capitalize())   # Output: Python at software moji

print(string.lower())        # Output: python at software moji

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3. Python join() Method

The join() method concatenates elements of a string or iterable by adding a specified separator.

Example Code:

python

print(“:”.join(“Python”))

Output:

P:y:t:h:o:n

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4. Reversing a String in Python

The reversed() function can be used to reverse a string.

Example Code:

python

string = “12345”

print(”.join(reversed(string)))

Output:

54321

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5. Python split() Method

The split() method divides a string into a list of substrings based on a delimiter.

Example Code:

python

word = “Software Moji Moji career Software Moji Moji”

print(word.split(‘ ‘))  # Split by spaces

print(word.split(‘r’))  # Split by the letter ‘r’

Output:

css

[‘Software’, ‘Moji’, ‘Moji’, ‘career’, ‘Software’, ‘Moji’, ‘Moji’]

[‘Softwa’, ‘e Moji Moji ca’, ‘ee’, ‘ Softwa’, ‘e Moji Moji’]

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Important Note on Python Strings

• Strings are immutable in Python. Methods like replace() return a new string instead of modifying the original one.
• To update a string with replace(), reassign the result:

Example Code:

python

x = “Software Moji Moji”

x = x.replace(“Software Moji Moji”, “Python”)

print(x)  # Output: Python

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Summary

Python offers powerful string manipulation capabilities using methods like replace(), join(), split(), reverse(), upper(), and lower(). Mastering these techniques will improve your efficiency in handling text data and writing cleaner code.

For advanced concepts, explore Python’s .format() function and additional string formatting methods.

Mutable vs Immutable Objects in Python

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