lesson1Title

lesson2Title

lesson3Title

lesson4Title

lesson5Title

lesson6Title

lesson7Title

lesson8Title

lesson9Title

lesson10Title

lesson11Title

lesson12Title

lesson13Title

lesson14Title

lesson15Title

lesson16Title

lesson17Title

lesson18Title

lesson19Title

pythonIntroStep1Chapter4Title

lesson20Title

lesson21Title

pythonIntroStep1Chapter1Title

pythonIntroStep1Chapter2Title

pythonIntroStep1Chapter3Title

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 two useful methods for string formatting in Python.

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 = "CodeFriends"
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 CodeFriends.
```

<br />

## f-Strings

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

```python
name = "CodeFriends"
age = 20

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

Features:
- You can include variable names, expressions, and function calls directly inside the curly braces `{}`.
- It is concise and improves code readability.
  ```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, where the number or position of variables may change | Suitable for simple formatting and quick expressions |

> *Tip*: For most modern Python projects, `f-strings` are preferred for their clarity and simplicity.

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

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

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, where the number or position of variables may change	Suitable for simple formatting and quick expressions