如果你需要2分钟来学习如何使用 Python 类型（即使你不使用 FastAPI ），看看这个简短的教程：[Python Types](python-types.md){.internal-link target=_blank}。

编写带有类型标注的标准 Python：

```Python
from datetime import date

from pydantic import BaseModel

# Declare a variable as a str
# and get editor support inside the function
def main(user_id: str):
    return user_id


# A Pydantic model
class User(BaseModel):
    id: int
    name: str
    joined: date
```

      ;;

    *)
      # we don't know what to do but we've got no CNI, return non-zero
      echo "${KUBERNETES_CNI} is not recognized. Supported options are \"calico\" or do not set the variable to use default."
      return 1
      ;;
  esac

  # If metrics server configuration directory is specified then deploy in
  # the cluster just created
  if [[ -n ${METRICS_SERVER_CONFIG_DIR:-} ]]; then

  TFE_ExecutorWaitForAllPendingNodes(executor, status);
  ASSERT_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  TFE_DeleteExecutor(executor);
  TF_DeleteStatus(status);
}

// Read the value of variable `var` and save it into `out_value`.
void ReadVariable(TFE_Context* ctx, TFE_TensorHandle* var,
                  TFE_TensorHandle** out_value) {
  TF_Status* status = TF_NewStatus();

		return true
	}
	return st.Sel.Name == "StringData"
}

// isVariable reports whether x is a variable, possibly with field references.
func (p *Package) isVariable(x ast.Expr) bool {
	switch x := x.(type) {
	case *ast.Ident:
		return true
	case *ast.SelectorExpr:
		return p.isVariable(x.X)
	case *ast.IndexExpr:
		return true
	}
	return false
}

```bash helm install --set existingSecret=my-minio-secret minio/minio ``` The following fields are expected in the secret: | .data.<key> in Secret | Corresponding variable | Description | Required | |:-------- | `rootUser` | `rootUser` | Root user. | yes | | `rootPassword` | `rootPassword` | Root password. | yes | All corresponding variables will be ignored in values file. Configure TLS ---------- To enable TLS for MinIO containers, acquire TLS certificates from a CA or create self-signed certificates....

```bash helm install --set existingSecret=my-minio-secret minio/minio ``` The following fields are expected in the secret: | .data.<key> in Secret | Corresponding variable | Description | Required | |:-------- | `rootUser` | `rootUser` | Root user. | yes | | `rootPassword` | `rootPassword` | Root password. | yes | All corresponding variables will be ignored in values file. Configure TLS ---------- To enable TLS for MinIO containers, acquire TLS certificates from a CA or create self-signed certificates....

        options.addOption(Option.builder()
                .longOpt(FORCE_INTERACTIVE)
                .desc(
                        "Run in interactive mode. Overrides, if applicable, the CI environment variable and --non-interactive/--batch-mode options")
                .build());
        options.addOption(Option.builder(SUPPRESS_SNAPSHOT_UPDATES)
                .longOpt("no-snapshot-updates")

```

////

Dit betekent:

* De variabele `prices` is een `dict`:
    * De sleutels van dit `dict` zijn van het type `str` (bijvoorbeeld de naam van elk item).
    * De waarden van dit `dict` zijn van het type `float` (bijvoorbeeld de prijs van elk item).

#### Union

Je kunt een variable declareren die van **verschillende types** kan zijn, bijvoorbeeld een `int` of een `str`.

Esse comando criará ou modificará algumas [variáveis ​​de ambiente](environment-variables.md){.internal-link target=_blank} que estarão disponíveis para os próximos comandos.

Uma dessas variáveis ​​é a variável `PATH`.

/// tip | "Dica"

Você pode aprender mais sobre a variável de ambiente `PATH` na seção [Variáveis ​​de ambiente](environment-variables.md#path-environment-variable){.internal-link target=_blank}.

///

    checkNotNull(fromKey);
    return newView(sortedDelegate.tailMap(fromKey));
  }

  public ImmutableSortedMap<K, V> tailMap(K fromKeyParam, boolean inclusive) {
    // Declare a "true" local variable so that the Checker Framework will infer nullness.
    K fromKey = fromKeyParam;
    checkNotNull(fromKey);
    if (!inclusive) {
      fromKey = higher(fromKey);
      if (fromKey == null) {