List and Set Hints

We've covered hints for basic types like str, int, float, and bool, but you can also add hints for container types: types that hold other values. For example:

• list: mutable sequence of values
• set: unordered collection of unique values
• dict: collection of key-value pairs
• tuple: immutable sequence of values

When we type-hint a container, we specify what kind of container it is and what type of values it contains. For example, a list of strings can be expressed as list[str]:

inventory: list[str] = ["Iron Sword", "Healing Potion"]

The "contained" type goes in square brackets after the container type. Similarly, for a set of strings, we would write set[str]:

unique_items: set[str] = {"Iron Sword", "Healing Potion"}