id	title	sidebar_label	sidebar_position	tags
python-string	String in Python	String in Python	7	Python Introduction of python Python Syntax Variables Operators Type Casting String

In Python, a string is a sequence of characters enclosed within single ('), double ("), or triple quotes (''' ''' or """ """).
It is used to store and manipulate textual data.

str1 = 'Hello'
str2 = "World"
str3 = '''This is a multi-line string.'''

Creating Strings

Strings can be created in several ways:

name = "Dhruba"
message = 'Welcome to Python'
multiline = """This
is a
multiline string."""

String Indexing and Slicing

Indexing: Access characters by position (starting at index 0).

text = "Python"
print(text[0])   # P
print(text[-1])  # n

Slicing: Extract a part of the string.

print(text[0:3])   # Pyt
print(text[::2])   # Pto
print(text[1:-1])  # ytho

String Methods

Method	Description
upper()	Converts all characters to uppercase
lower()	Converts all characters to lowercase
strip()	Removes spaces from both ends
replace(a, b)	Replaces a with b
startswith(val)	Checks if string starts with val
endswith(val)	Checks if string ends with val
find(val)	Finds the first index of val
count(val)	Counts occurrences of val

msg = " Hello Python "
print(msg.upper())                 # HELLO PYTHON
print(msg.strip())                 # Hello Python
print(msg.replace("Python", "JS")) # Hello JS

String Concatenation and Repetition

Concatenation with +:

first = "Hello"
second = "World"
print(first + " " + second)  # Hello World

Repetition with *:

print("Hi! " * 3)  # Hi! Hi! Hi!

Using in and not in Operators

Check for substring presence:

text = "Python is fun"
print("fun" in text)      # True
print("Java" not in text) # True

String Formatting

f-string (Python 3.6+)

name = "Dhruba"
age = 22
print(f"My name is {name} and I am {age} years old.")

format() method

print("My name is {} and I am {} years old.".format(name, age))

% operator

print("My name is %s and I am %d years old." % (name, age))

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Escape Sequences

Escape characters add special formatting in strings:

Escape	Meaning
\n	New line
\t	Tab space
\\	Backslash
\'	Single quote
\"	Double quote

print("Hello\nWorld")     # Line break
print("Name:\tDhruba")    # Tab

Multiline Strings

Triple quotes allow multi-line text:

message = """This is line 1
This is line 2
This is line 3"""
print(message)

Use Cases and Examples

Greet user

name = input("Enter your name: ")
print(f"Welcome, {name}!")

Count letters

text = "banana"
print(text.count("a"))  # 3

Read file and process

with open("file.txt") as f:
    data = f.read()
    print(data.lower())

Validate email domain

email = "user@example.com"
if email.endswith("@example.com"):
    print("Valid domain")

Summary

• Strings are immutable sequences of characters.
• Support indexing, slicing, concatenation, and repetition.
• Useful methods help in text processing.
• Use escape sequences for formatting.
• Use f-strings or format() for clean formatting.