Strings in Python

Strings are one of the most commonly used data types in Python. A string is a sequence of characters enclosed in quotes.

Creating Strings

You can create strings using single ('), double ("), or triple (''' or """) quotes.

# Single and double quotes
name = 'Python'
message = "Hello, World!"

# Triple quotes for multi-line strings
multi_line = """This is a
multi-line string."""

String Indexing

Each character in a string has an index, starting from 0.

language = "Python"
print(language[0])  # Output: P
print(language[-1]) # Output: n (last character)

String Slicing

Slicing allows you to get a sub-string from a string.

Syntax: string[start:end:step]

text = "Hello, Python"
print(text[0:5])   # Output: Hello
print(text[7:])    # Output: Python
print(text[::-1])  # Output: nohtyP ,olleH (reversed)

Common String Methods

Python provides many built-in methods to manipulate strings.

Method	Description
upper()	Converts string to uppercase
lower()	Converts string to lowercase
strip()	Removes whitespace from both ends
replace(old, new)	Replaces a substring with another
split(separator)	Splits string into a list

phrase = "  Python is fun!  "
print(phrase.strip().upper()) # Output: PYTHON IS FUN!

String Formatting (f-strings)

Introduced in Python 3.6, f-strings are a concise way to embed expressions inside string literals.

name = "Alice"
age = 25
print(f"My name is {name} and I am {age} years old.")
# Output: My name is Alice and I am 25 years old.