}
		}()

		if err = fc(tx); err == nil {
			panicked = false
			return tx.Commit().Error
		}
	}

	panicked = false
	return
}

// Begin begins a transaction with any transaction options opts
func (db *DB) Begin(opts ...*sql.TxOptions) *DB {
	var (
		// clone statement
		tx  = db.getInstance().Session(&Session{Context: db.Statement.Context, NewDB: db.clone == 1})
		opt *sql.TxOptions
		err error

<code>$foo(SB)</code> (absolute address).
The assembler also supports some (not necessarily all) addressing modes
specific to each architecture.
The sections below list these.
</p>

<p>
One detail evident in the examples from the previous sections is that data in the instructions flows from left to right:
<code>MOVQ</code> <code>$0,</code> <code>CX</code> clears <code>CX</code>.

{* ../../docs_src/bigger_applications/app_an_py39/routers/users.py hl[6,11,16] title["app/routers/users.py"] *}

You can think of `APIRouter` as a "mini `FastAPI`" class.

All the same options are supported.

All the same `parameters`, `responses`, `dependencies`, `tags`, etc.

/// tip

In this example, the variable is called `router`, but you can name it however you want.

///

    * Die dann von den Benutzeroberflächen der automatisch generierten interaktiven Dokumentation verwendet wird.

Das mag alles abstrakt klingen. Machen Sie sich keine Sorgen. Sie werden all das in Aktion sehen im [Tutorial – Benutzerhandbuch](tutorial/index.md){.internal-link target=_blank}.

```

</div>

## Create a Virtual Environment { #create-a-virtual-environment }

When you start working on a Python project **for the first time**, create a virtual environment **<abbr title="there are other options, this is a simple guideline">inside your project</abbr>**.

/// tip

You only need to do this **once per project**, not every time you work.

///

//// tab | `venv`

## Technical Details { #technical-details }

Modern versions of Python have support for **"asynchronous code"** using something called **"coroutines"**, with **`async` and `await`** syntax.

Let's see that phrase by parts in the sections below:

* **Asynchronous Code**
* **`async` and `await`**
* **Coroutines**

## Asynchronous Code { #asynchronous-code }

        assertTrue(result.getWarnings()
                .get(0)
                .contains("has scope 'import'. The 'import' scope is only valid in <dependencyManagement> sections"));

        assertTrue(result.getWarnings().get(1).contains("test:g"));
    }

    @Test
    void testBadDependencyManagementScope() throws Exception {

	// to test a mixed response of a successful & failure while deleting objects in a single request
	policyBytes := fmt.Appendf(nil, `{"Id": "Policy1637752602639", "Version": "2012-10-17", "Statement": [{"Sid": "Stmt1637752600730", "Action": "s3:DeleteObject", "Effect": "Allow", "Resource": "arn:aws:s3:::%s/public/*", "Principal": "*"}]}`, bucketName)
	rec := httptest.NewRecorder()

	totalNodesCount := len(globalEndpoints.Hostnames())
	if totalNodesCount == 0 {
		totalNodesCount = 1 // For standalone erasure coding
	}
	return totalNodesCount
}

// AuditLogOptions takes options for audit logging subsystem activity
type AuditLogOptions struct {
	Event     string
	APIName   string
	Status    string
	Bucket    string
	Object    string
	VersionID string
	Error     string

    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        """
        Add a *path operation* using an HTTP OPTIONS operation.

        ## Example

        ```python
        from fastapi import APIRouter, FastAPI

        app = FastAPI()
        router = APIRouter()

        @router.options("/items/")
        def get_item_options():
            return {"additions": ["Aji", "Guacamole"]}