<img src="/img/tutorial/extending-openapi/image03.png">

## Change the Theme

The same way you could set the syntax highlighting theme with the key `"syntaxHighlight.theme"` (notice that it has a dot in the middle):

```Python hl_lines="3"
{!../../../docs_src/configure_swagger_ui/tutorial002.py!}
```

That configuration would change the syntax highlighting color theme:

{!../../../docs_src/bigger_applications/app/routers/items.py!}
```

#### How relative imports work

!!! tip
    If you know perfectly how imports work, continue to the next section below.

A single dot `.`, like in:

```Python
from .dependencies import get_token_header
```

would mean:

This practice is common enough that it has a name, these environment variables are commonly placed in a file `.env`, and the file is called a "dotenv".

!!! tip
    A file starting with a dot (`.`) is a hidden file in Unix-like systems, like Linux and macOS.

    But a dotenv file doesn't really have to have that exact filename.

Was it `upper`? Was it `uppercase`? `first_uppercase`? `capitalize`?

Then, you try with the old programmer's friend, editor autocompletion.

You type the first parameter of the function, `first_name`, then a dot (`.`) and then hit `Ctrl+Space` to trigger the completion.

But, sadly, you get nothing useful:

<img src="/img/python-types/image01.png">

### Add types

Let's modify a single line from the previous version.

            firSymbolBuilder.classifierBuilder.buildTypeParameterSymbol(firDiagnostic.a),
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.TYPE_PARAMETER_ON_LHS_OF_DOT) { firDiagnostic ->
        TypeParameterOnLhsOfDotImpl(
            firSymbolBuilder.classifierBuilder.buildTypeParameterSymbol(firDiagnostic.a),
            firDiagnostic as KtPsiDiagnostic,
            token,

go.etcd.io/etcd/api/v3 v3.5.11/go.mod h1:Ot+o0SWSyT6uHhA56al1oCED0JImsRiU9Dc26+C2a+4=
go.etcd.io/etcd/client/pkg/v3 v3.5.11 h1:bT2xVspdiCj2910T0V+/KHcVKjkUrCZVtk8J2JF2z1A=
go.etcd.io/etcd/client/pkg/v3 v3.5.11/go.mod h1:seTzl2d9APP8R5Y2hFL3NVlD6qC/dOT+3kvrqPyTas4=
go.etcd.io/etcd/client/v3 v3.5.11 h1:ajWtgoNSZJ1gmS8k+icvPtqsqEav+iUorF7b0qozgUU=
go.etcd.io/etcd/client/v3 v3.5.11/go.mod h1:a6xQUEqFJ8vztO1agJh/KQKOMfFI8og52ZconzcDJwE=

 *   Add `tf.keras.layers.Identity`, a placeholder pass-through layer.
 *   Add `show_trainable` option to `tf.keras.utils.model_to_dot` to display layer trainable status in model plots.