type SignatureDoesNotMatch struct{}

func (e SignatureDoesNotMatch) Error() string {
	return "The request signature we calculated does not match the signature you provided. Check your key and signing method."
}

// StorageFull storage ran out of space.
type StorageFull struct{}

func (e StorageFull) Error() string {
	return "Storage reached its minimum free drive threshold."
}

```Python hl_lines="80-83"
{!> ../../docs_src/security/tutorial003.py!}
```

////

#### About `**user_dict`

`UserInDB(**user_dict)` means:

*Pass the keys and values of the `user_dict` directly as key-value arguments, equivalent to:*

```Python
UserInDB(
    username = user_dict["username"],
    email = user_dict["email"],
    full_name = user_dict["full_name"],
    disabled = user_dict["disabled"],

    "joined": "2018-11-30",
}

my_second_user: User = User(**second_user_data)
```

/// info

`**second_user_data` یعنی:

کلید ها و مقادیر دیکشنری `second_user_data` را مستقیما به عنوان ارگومان های key-value بفرست، که معادل است با : `User(id=4, name="Mary", joined="2018-11-30")`

///

### پشتیبانی ویرایشگر

        try {
            final List<String> list = new ArrayList<>();
            list.add("SessionId");
            list.add("SessionCreatedTime");
            list.add("Key");
            list.add("Value");
            list.add("CreatedTime");
            csvWriter.writeValues(list);

  // A pod will be in this map from the time when the API server processed the
  // eviction request to the time when the pod is seen by PDB controller
  // as having been marked for deletion (or after a timeout). The key in the map is the name of the pod
  // and the value is the time when the API server processed the eviction request. If
  // the deletion didn't occur and a pod is still there it will be removed from

		if t.Synchronous {
			return true
		}
	}
	return false
}

func (d ReplicateDecision) String() string {
	b := new(bytes.Buffer)
	for key, value := range d.targetsMap {
		fmt.Fprintf(b, "%s=%s,", key, value.String())
	}
	return strings.TrimSuffix(b.String(), ",")
}

// Set updates ReplicateDecision with target's replication decision

    }


    @Override
    public void reset () {
        super.reset();
        this.isPrimary = this.hasMore = true;
    }


    protected void reset ( int key, String lastName ) {
        reset();
    }


    @Override
    public boolean hasMoreElements () {
        return this.hasMore;
    }


    @Override

        },
        {
            "url": "http://example.com/dave.jpg",
            "name": "The Baz"
        }
    ]
}
```

/// info

Notice how the `images` key now has a list of image objects.

///

## Deeply nested models

You can define arbitrarily deeply nested models:

//// tab | Python 3.10+

```Python hl_lines="7  12  18  21  25"

	maxConcurrentAsyncSend = 50000
)

// Target - event target interface
type Target interface {
	ID() TargetID
	IsActive() (bool, error)
	Save(Event) error
	SendFromStore(store.Key) error
	Close() error
	Store() TargetStore
}

// TargetStore is a shallow version of a target.Store
type TargetStore interface {
	Len() int
}

// Stats is a collection of stats for multiple targets.

    causing some `Authenticator` calls to see a null route when non-null was expected.

 *  Fix: Use the correct key size in the name of `TLS_AES_128_CCM_8_SHA256` which is a TLS 1.3
    cipher suite. We accidentally specified a key size of 256, preventing that cipher suite from
    being selected for any TLS handshakes. We didn't notice because this cipher suite isn't