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width = 5
height = 3

# Using format() function
print("The area of the rectangle is {}.".format(width * height))
# Output: The area of the rectangle is 15.

print('=' * 40)

# Using f-string
print(f"The area of the rectangle is {width * height}.")
# Output: The area of the rectangle is 15.

print('=' * 40)

# Using format function for dynamic formatting
template = "Student Name: {}, Score: {}"
print(template.format("Alice", 95))
print(template.format("Bob", 88))

# Comparison of format() Function and f-Strings

The `f-string` and `format()` function are useful Python syntax for string formatting.

Let's summarize how each syntax is used and what characteristics they have.

<br />

## format Function

The `format()` function inserts variables into a string using curly braces `{}`.

```python title="Example of using format() function"
name = "CodeBuddy"
age = 20

# Using the format() function
message = "My name is {} and I am {} years old.".format(name, age)
print(message)
```

You can specify the order of variables using `{index}`.

```python title="Example of using index with format() function"
"I am {1} years old and my name is {0}.".format(name, age)
# Output: I am 20 years old and my name is CodeBuddy.
```

<br />

## f-Strings

`f-strings` use `f` or `F` before the string and allow you to include variables or expressions inside curly braces `{}` directly.

```python
name = "CodeBuddy"
age = 20

# Using f-strings
message = f"My name is {name} and I am {age} years old."
print(message)
```

Features:
- You can directly include variable names, expressions, and function calls inside the curly braces `{}`.
- It is concise and makes the code more readable.
  ```python
  width = 5
  height = 3
  print(f"The area of the rectangle is {width * height}.")  # Output: The area of the rectangle is 15.
  ```

<br />

## Comparison of `format()` Function and `f-Strings`

| Feature             | `format()` Function                                       | `f-Strings`                                       |
|---------------------|-----------------------------------------------------------|---------------------------------------------------|
| Python Version      | Python 2.7 and above                                      | Python 3.6 and above                               |
| Usage               | Requires `.format()` function call                        | Use `f` before the string and curly braces `{}`    |
| Expressions         | Not possible (only variables)                             | Possible (arithmetic operations, function calls, etc.) |
| Flexibility         | Suitable for dynamic formatting (when the number or position of variables is variable) | Suitable for simple formatting and quick expressions |

> *Tip*: In most modern Python projects, `f-strings` are recommended!

The isalpha() function checks if a string contains only alphabetic characters.

### What is the most appropriate option to fill in the blank?

Feature	`format()` Function	`f-Strings`
Python Version	Python 2.7 and above	Python 3.6 and above
Usage	Requires `.format()` function call	Use `f` before the string and curly braces `{}`
Expressions	Not possible (only variables)	Possible (arithmetic operations, function calls, etc.)
Flexibility	Suitable for dynamic formatting (when the number or position of variables is variable)	Suitable for simple formatting and quick expressions