app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


class User(BaseModel):
    username: str
    email: Union[str, None] = None
    full_name: Union[str, None] = None
    disabled: Union[bool, None] = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="******@****.***", full_name="John Doe"
    )

```

Note que substituímos o valor padrão de `None` para `Query(default=None)`, o primeiro parâmetro de `Query` serve para o mesmo propósito: definir o valor padrão do parâmetro.

Então:

```Python
q: Union[str, None] = Query(default=None)
```

...Torna o parâmetro opcional, da mesma maneira que:

```Python
q: Union[str, None] = None
```

Mas o declara explicitamente como um parâmetro de consulta.

    minimum: Optional[float] = None
    exclusiveMinimum: Optional[float] = None
    maxLength: Optional[int] = Field(default=None, ge=0)
    minLength: Optional[int] = Field(default=None, ge=0)
    pattern: Optional[str] = None
    maxItems: Optional[int] = Field(default=None, ge=0)
    minItems: Optional[int] = Field(default=None, ge=0)
    uniqueItems: Optional[bool] = None
    maxContains: Optional[int] = Field(default=None, ge=0)

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: Union[bool, None] = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}


@app.put("/items/{item_id}")
def update_item(item_id: int, item: Item):

  }

  public void testToArray() {
    // need explicit type parameter to avoid javac warning!?
    List<Long> none = Arrays.<Long>asList();
    assertThat(Longs.toArray(none)).isEqualTo(EMPTY);

    List<Long> one = Arrays.asList((long) 1);
    assertThat(Longs.toArray(one)).isEqualTo(ARRAY1);

    long[] array = {(long) 0, (long) 1, 0x0FF1C1AL};

re(e,t){for(var n,r,i,o,a,s,u,l=[],c=0,f=e.length;c<f;c++)(r=e[c]).style&&(n=r.style.display,t?("none"===n&&(l[c]=_.get(r,"display")||null,l[c]||(r.style.display="")),""===r.style.display&&ee(r)&&(l[c]=(u=a=o=void 0,a=(i=r).ownerDocument,s=i.nodeName,(u=ne[s])||(o=a.body.appendChild(a.createElement(s)),u=ce.css(o,"display"),o.parentNode.removeChild(o),"none"===u&&(u="block"),ne[s]=u)))):"none"!==n&&(l[c]="none",_.set(r,"display",n)));for(c=0;c<f;c++)null!=l[c]&&(e[c].style.display=l[c]);return e}ce.f...

So, you can confirm if you are in the correct virtual environment.

/// tip

It's easy to activate one virtual environment, get one Python, and then **go to another project**.

And the second project **wouldn't work** because you are using the **incorrect Python**, from a virtual environment for another project.

	}

	return nil
}

func (r RedisArgs) validateFormat(c redis.Conn) error {
	typeAvailable, err := redis.String(c.Do("TYPE", r.Key))
	if err != nil {
		return err
	}

	if typeAvailable != "none" {
		expectedType := "hash"
		if r.Format == event.AccessFormat {
			expectedType = "list"
		}

		if typeAvailable != expectedType {

hasRun?this.result:(f=a,g.haltValidation(this.$form),this.haltedFormValidation=!0,this.isRunning=!0,this.$input.attr("disabled","disabled").addClass("async-validation"),this.$form.addClass("async-validation"),b(function(a){this.done(a)}.bind(this)),null)},d.prototype.done=function(a){this.result=a,this.hasRun=!0,this.isRunning=!1,this.$input.removeAttr("disabled").removeClass("async-validation"),this.$form.removeClass("async-validation"),this.haltedFormValidation&&(g.unHaltValidation(this.$form)...

                    "loc": ["body", "file"],
                    "msg": "Field required",
                    "input": None,
                },
                {
                    "type": "missing",
                    "loc": ["body", "fileb"],
                    "msg": "Field required",
                    "input": None,
                },
                {
                    "type": "missing",