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docs/en/docs/advanced/advanced-python-types.md

Here's a tip from my very **subjective** point of view:

* 🚨 Avoid using `Optional[SomeType]`
* Instead ✨ **use `Union[SomeType, None]`** ✨.

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Wed Feb 11 18:32:12 GMT 2026

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github.com/tiangolo/fastapi

tests/test_request_params/test_form/test_optional_list.py

@pytest.mark.parametrize(
    "path",
    ["/optional-list-str", "/model-optional-list-str"],
)
def test_optional_list_str_missing(path: str):
    client = TestClient(app)
    response = client.post(path)
    assert response.status_code == 200, response.text
    assert response.json() == {"p": None}


@pytest.mark.parametrize(
    "path",
    ["/optional-list-str", "/model-optional-list-str"],
)

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Tue Feb 17 09:59:14 GMT 2026

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github.com/elastic/elasticsearch

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/util/Util.java

    /**
     * @param project The project to look for test Java resources.
     * @return An Optional that contains the Java test SourceSet if it exists.
     */
    public static Optional<SourceSet> getJavaTestSourceSet(Project project) {
        return project.getExtensions().findByName("java") == null
            ? Optional.empty()
            : Optional.ofNullable(getJavaSourceSets(project).findByName(SourceSet.TEST_SOURCE_SET_NAME));
    }

Created: Wed Apr 08 16:19:15 GMT 2026

- Last Modified: Tue Jul 27 15:18:50 GMT 2021

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github.com/apache/maven

impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/LayeredOptions.java

        for (O option : options) {
            Optional<T> o = getter.apply(option);
            if (o.isPresent()) {
                return o;
            }
        }
        return Optional.empty();
    }

    protected Optional<List<String>> collectListIfPresentOrEmpty(Function<O, Optional<List<String>>> getter) {
        int had = 0;
        ArrayList<String> items = new ArrayList<>();

Created: Sun Apr 05 03:35:12 GMT 2026

- Last Modified: Wed Feb 26 17:31:44 GMT 2025

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github.com/tiangolo/fastapi

tests/test_request_params/test_query/test_optional_str.py

    )


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str_missing(path: str):
    client = TestClient(app)
    response = client.get(path)
    assert response.status_code == 200
    assert response.json() == {"p": None}


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str(path: str):

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Tue Feb 17 09:59:14 GMT 2026

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github.com/tiangolo/fastapi

tests/test_request_params/test_body/test_optional_str.py

@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str_missing_empty_dict(path: str):
    client = TestClient(app)
    response = client.post(path, json={})
    assert response.status_code == 200, response.text
    assert response.json() == {"p": None}


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str(path: str):

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Tue Feb 17 09:59:14 GMT 2026

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github.com/apache/maven

api/maven-api-cli/src/main/java/org/apache/maven/api/cli/mvn/MavenOptions.java

     * @return an {@link Optional} containing the list of profile names to activate, or empty if not specified
     */
    @Nonnull
    Optional<List<String>> activatedProfiles();

    /**
     * Indicates whether Maven should suppress SNAPSHOT updates.
     *
     * @return an {@link Optional} containing true if SNAPSHOT updates should be suppressed, false if not, or empty if not specified
     */
    @Nonnull

Created: Sun Apr 05 03:35:12 GMT 2026

- Last Modified: Wed Jun 11 13:14:09 GMT 2025

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github.com/tiangolo/fastapi

tests/test_request_params/test_form/test_optional_str.py

    }


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str_missing(path: str):
    client = TestClient(app)
    response = client.post(path)
    assert response.status_code == 200
    assert response.json() == {"p": None}


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str(path: str):

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Tue Feb 17 09:59:14 GMT 2026

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github.com/google/guava

android/guava-tests/test/com/google/common/collect/ComparatorsTest.java

  public void testEmptiesFirst() {
    Optional<String> empty = Optional.empty();
    Optional<String> abc = Optional.of("abc");
    Optional<String> z = Optional.of("z");

    Comparator<Optional<String>> comparator = emptiesFirst(comparing(String::length));
    testComparator(comparator, empty, z, abc);

    // Just demonstrate that no explicit type parameter is required
    Comparator<Optional<String>> unused = emptiesFirst(naturalOrder());

Created: Fri Apr 03 12:43:13 GMT 2026

- Last Modified: Sat Apr 12 15:07:59 GMT 2025

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github.com/tiangolo/fastapi

tests/test_request_params/test_file/test_optional.py

@pytest.mark.parametrize(
    "path",
    [
        "/optional-bytes",
        "/optional-uploadfile",
    ],
)
def test_optional_missing(path: str):
    client = TestClient(app)
    response = client.post(path)
    assert response.status_code == 200, response.text
    assert response.json() == {"file_size": None}


@pytest.mark.parametrize(
    "path",
    [
        "/optional-bytes",
        "/optional-uploadfile",
    ],

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Sat Feb 21 13:01:31 GMT 2026

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