Strings in Python

In Python, a string is a sequence of characters enclosed within quotation marks. Strings are a fundamental data type in Python and can be used to store and manipulate textual data.

Here are some examples of strings in Python:

1. Declaring a string variable:

my_string = "Hello, world!"
print(my_string)  # Output: "Hello, world!"

2. Accessing characters in a string using indexing:

my_string = "Hello, world!"
print(my_string[0])  # Output: "H"
print(my_string[7])  # Output: "w"

3. Slicing a string to extract a substring:

my_string = "Hello, world!"
print(my_string[0:5])  # Output: "Hello"

4. Concatenating strings:

first_name = "John"
last_name = "Doe"
full_name = first_name + " " + last_name
print(full_name)  # Output: "John Doe"

5. Formatting strings using placeholders:

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

6. Using f-strings for string interpolation:

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

7. Reversing a string:

my_string = "Hello, world!"
reversed_string = my_string[::-1]
print(reversed_string)  # Output: "!dlrow ,olleH"

Note that strings in Python are immutable, which means that once a string is created, it cannot be modified. Any operation that appears to modify a string actually creates a new string object.