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# Example 1: Inserting Variable Values
name = "John"
age = 20
print(f"Hello! My name is {name} and I am {age} years old.")
print()


# Example 2: Using Expressions
number = 10
print(f"The result of dividing {number} by 2 is {number / 2}.")
print()


# Example 3: Inserting Strings
favorite_language = "Python"
print(f"My favorite programming language is {favorite_language}.")
print()


# Example 4: Displaying Calculation Results
price_per_item = 15
quantity = 3
total_price = price_per_item * quantity
print(f"Buying {quantity} items costs a total of ${total_price}.")

# How to Format Strings with f-Strings

`f-strings` provide a simple and readable way to insert variable values or expressions directly into strings in Python.

They are used by prefixing the string with `f` or `F`, and variables or expressions can be inserted within curly braces `{}`.

```python title="Example of using f-strings"
name = "CodeFriends"
age = 20

greeting = f"My name is {name}, and I am {age} years old."

# "My name is CodeFriends, and I am 20 years old."
print(greeting)
```

In this example, the `f-string` is used to insert the values of the variables `name` and `age` into the string `greeting`.

<br />

## Applying Expressions in f-Strings

Within an f-string, you can include expressions such as **arithmetic operations**, **comparisons**, and more.

> An *expression* is a combination of variables, values, or operations that evaluates to a result.

<br />

```python title="Example of using an exponentiation expression"
number = 10

result = f"The square of 10 is {number**2}."

print(result)  # "The square of 10 is 100."
```

F-strings allow you to directly insert the values of variables and expressions into the string.

You cannot perform arithmetic operations inside an f-string.

How to Format Strings with f-Strings