Tham số `name` được định nghĩa là `Optional[str]`, nhưng nó **không phải là tùy chọn**, bạn không thể gọi hàm mà không có tham số:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

Tham số `name` **vẫn được yêu cầu** (không phải là *tùy chọn*) vì nó không có giá trị mặc định. Trong khi đó, `name` chấp nhận `None` như là giá trị:

```Python
say_hi(name=None)  # This works, None is valid 🎉
```

      keyStore.setKeyEntry("private", heldCertificate.keyPair.private, password, chain)
    }

    // https://github.com/bcgit/bc-java/issues/1160
    val isBouncyCastle = keyStore.provider.name == "BC"
    val algorithm = if (isBouncyCastle) "PKIX" else KeyManagerFactory.getDefaultAlgorithm()

    val factory = KeyManagerFactory.getInstance(algorithm)
    factory.init(keyStore, password)

name: TensorFlow Issue Template
description: Use this template to report TensorFlow-related issues
body:
  - type: dropdown
    id: issue-type
    attributes:
      label: Issue type
      description: What type of issue would you like to report?
      multiple: false
      options:
        - Bug
        - Build/Install
        - Performance
        - Support
        - Feature Request
        - Documentation Feature Request

      comment syntax for the file format. We also recommend that a
      file or class name and description of purpose be included on the
      same "printed page" as the copyright notice for easier
      identification within third-party archives.

   Copyright [yyyy] [name of copyright owner]

   Licensed under the Apache License, Version 2.0 (the "License");

      comment syntax for the file format. We also recommend that a
      file or class name and description of purpose be included on the
      same "printed page" as the copyright notice for easier
      identification within third-party archives.

   Copyright [yyyy] [name of copyright owner]

   Licensed under the Apache License, Version 2.0 (the "License");

      comment syntax for the file format. We also recommend that a
      file or class name and description of purpose be included on the
      same "printed page" as the copyright notice for easier
      identification within third-party archives.

   Copyright [yyyy] [name of copyright owner]

   Licensed under the Apache License, Version 2.0 (the "License");

 */
public class MsrpcLsarOpenPolicy2 extends lsarpc.LsarOpenPolicy2 {

    /**
     * Creates a new request to open an LSA policy handle.
     *
     * @param server the server name to connect to
     * @param access the desired access rights
     * @param policyHandle the policy handle to be populated
     */

			[in,string] wchar_t *sharename,
			[in] int level,
			[out,switch_is(level)] ShareInfo *info);

	typedef struct {
		unsigned long platform_id;
		[string] wchar_t *name;
	} ServerInfo100;

	typedef [switch_type(int)] union {
		[case(0)] ServerInfo100 *info0;
	} ServerInfo;

	[op(0x15)]
	int ServerGetInfo([in,string,unique] wchar_t *servername,
			[in] int level,

    }
  }

  @J2ktIncompatible
  @GwtIncompatible // reflection
  public static Method getMethod(Class<?> clazz, String name) {
    try {
      return clazz.getMethod(name);
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  /**
   * Useless constructor for a class of static utility methods.
   *

     *
     * @return the toolchain type
     */
    String getType();

    /**
     * Gets the platform tool executable.
     *
     * @param toolName the tool platform independent tool name.
     * @return file representing the tool executable, or null if the tool can not be found
     */
    String findTool(String toolName);