```Python hl_lines="1  4"
{!../../docs_src/python_types/tutorial009_py39.py!}
```

Using `Optional[str]` instead of just `str` will let the editor help you detect errors where you could be assuming that a value is always a `str`, when it could actually be `None` too.

`Optional[Something]` is actually a shortcut for `Union[Something, None]`, they are equivalent.

* Retry 'connection refused' errors when setting up clusters on GCE. ([#57394](https://github.com/kubernetes/kubernetes/pull/57394), [@mborsz](https://github.com/mborsz))
* Retry 'connection refused' errors when setting up clusters on GCE. ([#57394](https://github.com/kubernetes/kubernetes/pull/57394), [@mborsz](https://github.com/mborsz))

]

[tool.coverage.report]
show_missing = true
sort = "-Cover"

[tool.coverage.html]
show_contexts = true

[tool.ruff.lint]
select = [
    "E",  # pycodestyle errors
    "W",  # pycodestyle warnings
    "F",  # pyflakes
    "I",  # isort
    "B",  # flake8-bugbear
    "C4",  # flake8-comprehensions
    "UP",  # pyupgrade
]
ignore = [

var erasureHealTests = []struct {
	dataBlocks, disks int

	// number of offline disks is also number of staleDisks for
	// erasure reconstruction in this test
	offDisks int

	// bad disks are online disks which return errors
	badDisks, badStaleDisks int

	blocksize, size int64
	algorithm       BitrotAlgorithm
	shouldFail      bool
}{

И мы, как разработчики, продолжаем улучшать код — находим баги и добавляем новые возможности (иногда добавляя новые баги 😅).

### Небольшие ошибки обрабатываются автоматически { #small-errors-automatically-handled }

Создавая веб‑API с FastAPI, если в нашем коде возникает ошибка, FastAPI обычно «локализует» её в пределах одного запроса, который эту ошибку вызвал. 🛡

     *
     * @param paramMap the data store parameters
     * @param dataMap the document data to store
     * @throws DataStoreException if required fields are missing or other errors occur
     */
    @Override
    public void store(final DataStoreParams paramMap, final Map<String, Object> dataMap) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();

                System.arraycopy(data, offset + 8, addr, 0, 16);
                return InetAddress.getByAddress(addr);
            }
        } catch (Exception e) {
            // Ignore parsing errors
        }
        return null;
    }

    private boolean checkRSSCapability() {
        // Platform-specific RSS detection - simplified implementation
        try {

     */
    protected enum Result {
        /** Thumbnail was successfully generated */
        OK,
        /** Thumbnail generation failed due to processing errors */
        FAILED,
        /** Image dimensions do not meet validation requirements */
        INVALID_SIZE,
        /** No valid image data was found in the input */
        NO_IMAGE;
    }

  project
- nice little sample projects that could be run in the core as well as integration tests

All Possible Errors
- invalid lifecycle phase (maybe same as bad CLI param, though you were talking about embedder too)
- <module> specified is not found
- malformed settings
- malformed POM
- local repository not writable

		t.Fatalf("%s : %s", instanceType, err.Error())
	}

	obj.DeleteBucket(context.Background(), "abc", DeleteBucketOptions{})

	// Collection of non-exhaustive PutObjectPart test cases, valid errors
	// and success responses.
	testCases := []struct {
		bucketName      string
		objName         string
		uploadID        string
		PartID          int
		inputReaderData string
		inputMd5        string