// is for performance optimization by reusing an exiting unused op rather than
// creating a new op every time. If `raw_device_name` is `NULL` or empty, it
// does not set the device name. If it's not `NULL`, then it attempts to parse
// and set the device name. It's effectively `TFE_OpSetDevice`, but it is faster
// than separately calling it because if the existing op has the same
// `raw_device_name`, it skips parsing and just leave as it is.

举个例子，看这段函数：

```python
from typing import Optional


def say_hi(name: Optional[str]):
    print(f"Hey {name}!")
```

参数 `name` 被定义为 `Optional[str]`，但它并不是“可选”的，你不能不传这个参数就调用函数：

```Python
say_hi()  # 哎呀，这会报错！😱
```

参数 `name` 仍然是必填的（不是“可选”），因为它没有默认值。不过，`name` 接受 `None` 作为取值：

```Python
say_hi(name=None)  # 这样可以，None 是有效的 🎉
```

好消息是，在大多数情况下，你可以直接使用 `|` 来定义类型联合：

```python

     * Creates a simple circuit breaker with default settings
     *
     * @param name the circuit breaker name
     */
    public SimpleCircuitBreaker(String name) {
        this(name, 5, 3, 30000L); // 5 failures, 3 successes, 30 second timeout
    }

    /**
     * Creates a simple circuit breaker
     *
     * @param name the circuit breaker name
     * @param failureThreshold number of consecutive failures to open circuit

# buildifier: disable=load-on-top

workspace(name = "org_tensorflow")

# buildifier: disable=load-on-top

load("//third_party:repo.bzl", "tf_http_archive", "tf_mirror_urls")

tf_http_archive(
    name = "rules_shell",
    sha256 = "bc61ef94facc78e20a645726f64756e5e285a045037c7a61f65af2941f4c25e1",
    strip_prefix = "rules_shell-0.4.1",
    urls = tf_mirror_urls(

    }

    /**
     * Returns whether the property is a target property.
     *
     * @param name
     *            The property name
     * @return Whether the property is a target property
     */
    protected boolean isTargetProperty(final String name) {
        if (prefix != null && !name.startsWith(prefix)) {
            return false;
        }
        if (!includePropertyNames.isEmpty()) {

    }

    public void addSearchFieldLogValue(final String name, final String value) {
        if (StringUtil.isNotBlank(name) && StringUtil.isNotBlank(value)) {
            searchFieldLogList.add(new Pair<>(name, value));
        }
    }

    public void addRequestHeaderValue(final String name, final String value) {
        if (StringUtil.isNotBlank(name) && StringUtil.isNotBlank(value)) {

    }

    public void setName_Equal(String name) {
        setName_Term(name, null);
    }

    public void setName_Equal(String name, ConditionOptionCall<TermQueryBuilder> opLambda) {
        setName_Term(name, opLambda);
    }

    public void setName_Term(String name) {
        setName_Term(name, null);
    }

    public void setName_Term(String name, ConditionOptionCall<TermQueryBuilder> opLambda) {

    private static final long serialVersionUID = 1L;

    /**
     * The name of the property.
     */
    private final String propertyName;

    /**
     * The value that caused the conversion error.
     */
    private final Object value;

    /**
     * Constructs an instance.
     *
     * @param propertyName
     *            Property name
     * @param value
     *            Value
     * @param cause

     */
    private final Class<?> targetClass;

    /**
     * The name of the field.
     */
    private final String fieldName;

    /**
     * Creates a {@link FieldNotStaticRuntimeException}.
     *
     * @param targetClass
     *            Target class
     * @param fieldName
     *            Field name
     */

     */
    private final Class<?> targetClass;

    /**
     * The name of the method.
     */
    private final String methodName;

    /**
     * Creates a {@link MethodNotStaticRuntimeException}.
     *
     * @param targetClass
     *            Target class
     * @param methodName
     *            Method name
     */