{!../../../docs_src/first_steps/tutorial001.py!}
```

O `@app.get("/")` diz ao **FastAPI** que a função logo abaixo é responsável por tratar as requisições que vão para:

* a rota `/`
* usando o  <abbr title="o método HTTP GET">operador <code>get</code></abbr>

!!! info "`@decorador`"
    Essa sintaxe `@alguma_coisa` em Python é chamada de "decorador".

    Você o coloca em cima de uma função. Como um chapéu decorativo (acho que é daí que vem o termo).

    - key: istio-injection
      operator: DoesNotExist
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: NotIn
      values:
      - "false"
{{- include "core" (mergeOverwrite (deepCopy $whv) (dict "Prefix" "rev.object.") ) }}
  namespaceSelector:
    matchExpressions:
    - key: istio.io/rev
      operator: DoesNotExist
    - key: istio-injection
      operator: DoesNotExist
  objectSelector:

      operator: DoesNotExist
    - key: istio.io/rev
      operator: DoesNotExist
    - key: "kubernetes.io/metadata.name"
      operator: "NotIn"
      values: ["kube-system","kube-public","kube-node-lease","local-path-storage"]
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: DoesNotExist
    - key: istio.io/rev
      operator: DoesNotExist

  namespaceSelector:
    matchExpressions:
    - key: istio.io/rev
      operator: DoesNotExist
    - key: istio-injection
      operator: DoesNotExist
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: NotIn
      values:
      - "false"
    - key: istio.io/rev
      operator: In
      values:
      {{- if (eq .Values.revision "") }}
      - "default"

  namespaceSelector:
    matchExpressions:
    - key: istio.io/rev
      operator: DoesNotExist
    - key: istio-injection
      operator: DoesNotExist
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: NotIn
      values:
      - "false"
    - key: istio.io/rev
      operator: In
      values:
      {{- if (eq .Values.revision "") }}
      - "default"

					}
				}
				operator, matchType, value := toLowerString(condt[0]), toLowerString(condt[1]), toString(condt[2])
				if !strings.HasPrefix(matchType, "$") {
					return parsedPolicy, fmt.Errorf("Invalid according to Policy: Policy Condition failed: [%s, %s, %s]", operator, matchType, value)
				}

metadata:
  name: istio-cni
  labels:
    app: istio-cni
    release: {{ .Release.Name }}
    istio.io/rev: {{ .Values.revision | default "default" }}
    install.operator.istio.io/owning-resource: {{ .Values.ownerName | default "unknown" }}
    operator.istio.io/component: "Cni"
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: istio-cni
subjects:
- kind: ServiceAccount
  name: istio-cni

var bb = make([]byte, 1.0<<s)  // 1.0 has type int; len(bb) == 0
</pre>

<h4 id="Operator_precedence">Operator precedence</h4>
<p>
Unary operators have the highest precedence.
As the  <code>++</code> and <code>--</code> operators form
statements, not expressions, they fall
outside the operator hierarchy.
As a consequence, statement <code>*p++</code> is the same as <code>(*p)++</code>.
</p>
<p>

	"istio.io/istio/operator/pkg/util/clog"
	"istio.io/istio/operator/pkg/util/progress"
	"istio.io/istio/operator/pkg/verifier"
	pkgversion "istio.io/istio/operator/pkg/version"
	operatorVer "istio.io/istio/operator/version"
	"istio.io/istio/pkg/art"
	"istio.io/istio/pkg/config/constants"
	"istio.io/istio/pkg/config/labels"
	"istio.io/istio/pkg/kube"
)

type InstallArgs struct {

  namespace: {{ .Release.Namespace }}
  labels:
    app: istiod
    istio.io/rev: {{ .Values.revision | default "default" | quote }}
    install.operator.istio.io/owning-resource: {{ .Values.ownerName | default "unknown" }}
    operator.istio.io/component: "Pilot"
    release: {{ .Release.Name }}
    istio: pilot
spec:
  minAvailable: 1
  selector:
    matchLabels:
      app: istiod