from fastapi import FastAPI
from pydantic import BaseModel
from typing import Union

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):

Webargs is a tool that was made to provide that on top of several frameworks, including Flask.

It uses Marshmallow underneath to do the data validation. And it was created by the same developers.

It's a great tool and I have used it a lot too, before having **FastAPI**.

/// info

    }

    public void bool(BoolCall<LabelTypeCQ> boolLambda) {
        bool(boolLambda, null);
    }

    public void bool(BoolCall<LabelTypeCQ> boolLambda, ConditionOptionCall<BoolQueryBuilder> opLambda) {
        LabelTypeCQ mustQuery = new LabelTypeCQ();
        LabelTypeCQ shouldQuery = new LabelTypeCQ();
        LabelTypeCQ mustNotQuery = new LabelTypeCQ();
        LabelTypeCQ filterQuery = new LabelTypeCQ();

	// STS Router
	stsRouter := router.NewRoute().PathPrefix(SlashSeparator).Subrouter()

	// Assume roles with no JWT, handles AssumeRole.
	stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
		ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))
		authOk := wildcard.MatchSimple(signV4Algorithm+"*", r.Header.Get(xhttp.Authorization))

	return policy, err
}

// IsAllowed - checks given policy args is allowed to continue the Rest API.
func (sys *PolicySys) IsAllowed(args policy.BucketPolicyArgs) bool {
	p, err := sys.Get(args.BucketName)
	if err == nil {
		return p.IsAllowed(args)
	}

	// Log unhandled errors.
	if _, ok := err.(BucketPolicyNotFound); !ok {
		internalLogIf(GlobalContext, err, logger.WarningKind)

}

// TokenReviewStatus is the result of the token authentication request.
message TokenReviewStatus {
  // Authenticated indicates that the token was associated with a known user.
  // +optional
  optional bool authenticated = 1;

  // User is the UserInfo associated with the provided token.
  // +optional
  optional UserInfo user = 2;

  // Audiences are audience identifiers chosen by the authenticator that are

	json := jsoniter.ConfigCompatibleWithStandardLibrary
	if err := json.Unmarshal(reqBytes, &cfg); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	var ignoreInUse bool
	if forceStr := r.Form.Get("force"); forceStr != "" {
		ignoreInUse, _ = strconv.ParseBool(forceStr)
	}

	// Disallow remote tiers with internal storage class names
	switch cfg.Name {

	startTime time.Time, endTime time.Time, opts ...promv1.Option,
) ([]prometheus_model.LabelSet, promv1.Warnings, error) {
	return nil, nil, nil
}

func (client mockPromAPI) Snapshot(ctx context.Context, skipHead bool) (promv1.SnapshotResult, error) {
	return promv1.SnapshotResult{}, nil
}

func (client mockPromAPI) Rules(ctx context.Context) (promv1.RulesResult, error) {
	return promv1.RulesResult{}, nil
}

              const std::vector<TF_Operation*>& inputs,
              const std::vector<TF_Operation*>& outputs,
              const std::vector<string>& output_names,
              bool expect_failure = false) {
    DefineT(num_opers, opers, ToOutput(inputs), ToOutput(outputs), output_names,
            expect_failure);
  }

  // Caller must delete[] the returned value

		}
	}
}

func Test_metacacheReader_readFn(t *testing.T) {
	r := loadMetacacheSample(t)
	defer r.Close()
	i := 0
	err := r.readFn(func(entry metaCacheEntry) bool {
		want := loadMetacacheSampleNames[i]
		if entry.name != want {
			t.Errorf("entry %d, want %q, got %q", i, want, entry.name)
		}
		i++
		return true
	})
	if err != io.EOF {
		t.Fatal(err)
	}