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my_tuple = (1, 2, 3)

# (1, 2, 3) 출력
print(my_tuple)

# Immutable Collection of Values, Tuple

A `tuple` is a data type similar to a list, but once defined, its **values cannot be changed**.

In this lesson, we will learn what a tuple is and how to use it.

<br />

## Defining a Tuple

A tuple is a data type that can bundle multiple pieces of data into a single set, and it's created using parentheses `(` and `)`.

Each value is separated by a comma `,`, and once a tuple is defined, its values cannot be changed.

For example, here's how you can create a tuple with three values.

```python title="Example of tuple creation"
my_tuple = (1, 2, 3)

# Output: (1, 2, 3)
print(my_tuple)
```

<br />

## Immutability of Tuples

Once a tuple is created, it has the property of `immutability`, meaning that you cannot change its values. If you try to change its values like you would with a list, an error will occur.

```python title="Tuples cannot change values"
my_tuple = (1, 2, 3)

# Error occurs, cannot change values in a tuple due to immutability
my_tuple[0] = 4
```

Thanks to this immutable property, tuples are useful for defining values that should never change after being set.

For example, you can use tuples to bundle fixed data such as the coordinates of a location or the primary colors of a service.

```python title="Using tuples to represent coordinates"
# GPS coordinates (latitude, longitude)
gps_coordinates = (40.7128, -74.0060)
```

<br />

## Tuples vs. Lists: When to Use Which?

So, when should you use a tuple, and when should you use a list?

- *List*: Use when you might need to change the values. Suitable for scenarios like a shopping list where items can be added or altered.
  
- *Tuple*: Use when the values are fixed and do not need to change. Suitable for handling GPS coordinates or set configuration values.

A tuple has the property of immutability, meaning that the values within it cannot be changed once defined. Unlike a list, this means you cannot modify or add values. Tuples are useful when you need to ensure the values remain constant.

A tuple is a data type that cannot be modified once defined. It is similar to a list but how is it different?