As the list is a type that contains some internal types, you put them in square brackets:

    ```Python hl_lines="4"
    {!> ../../../docs_src/python_types/tutorial006.py!}
    ```

!!! info
    Those internal types in the square brackets are called "type parameters".

    In this case, `str` is the type parameter passed to `List` (or `list` in Python 3.9 and above).