Python Strings

Python strings are sequences of characters, which are used to store and represent text-based information. Strings are immutable, meaning they cannot be changed once created.

A string is created by enclosing a sequence of characters in single or double quotes. For example:

my_string = "Hello World!"

This creates a string object with the value "Hello World!".

Strings can be concatenated (combined) using the + operator. For example:

my_string = "Hello"
my_string += " World!"

This creates a new string object with the value "Hello World!".

Strings can also be multiplied by an integer value using the * operator. For example:

my_string = "Hello"
my_string *= 3

This creates a new string object with the value "HelloHelloHello".

Strings can be indexed using square brackets. For example:

my_string = "Hello World!"
print(my_string[0])

This prints the character at index 0 of the string, which is "H".

Strings can also be sliced using square brackets. For example:

my_string = "Hello World!"
print(my_string[2:5])

This prints the characters at index 2, 3, and 4 of the string, which is "llo".

Strings also have a number of built-in methods that can be used to manipulate them. For example:

my_string = "Hello World!"
print(my_string.upper())

This prints the string in all uppercase letters, which is "HELLO WORLD!".

Python strings are powerful and versatile, and are used in many different applications. They are an essential part of any Python program.