この引数を省略するとデフォルト値として`None`が返されますが、ここではデフォルト値として`"World"`を指定しています。

///

次に、このPythonプログラムを呼び出します。

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// Here we don't set the env var yet
$ python main.py

// As we didn't set the env var, we get the default value

Hello World from Python

// But if we create an environment variable first
$ export MY_NAME="Wade Wilson"

// And then call the program again

   * {@code Optional.orElse(null)}.
   */
  public abstract @Nullable T orNull();

  /**
   * Returns an immutable singleton {@link Set} whose only element is the contained instance if it
   * is present; an empty immutable {@link Set} otherwise.
   *
   * <p><b>Comparison to {@code java.util.Optional}:</b> this method has no equivalent in Java 8's
   * {@code Optional} class. However, this common usage:

      listOf(
        "--patch-module",
        "$moduleName=${compileKotlinTask.destinationDirectory.get().asFile}",
      ),
    )

    classpath = compileKotlinTask.libraries
    modularity.inferModulePath.set(true)
  }

<module>
<source path="">
  <!-- Hack to keep collect from hiding collect.testing supersource: -->
  <exclude name="**/testing/**"/>
</source>

<!--
    We used to set this only for packages that had manual supersource. That
    worked everywhere that I know of except for one place: when running the GWT
    util.concurrent tests under Guava.

    The problem is that GWT responds poorly to two .gwt.xml files in the same
    Java package; see

        MavenProject projectModuleD = getMavenProject(MODULE_D, projectParent, "bom");

        projectParent.setCollectedProjects(singletonList(projectModuleD));

        // Set up needed mocks
        when(session.getRequest()).thenReturn(mavenExecutionRequest);
        when(session.getProjects()).thenReturn(null); // needed, otherwise it will be an empty list by default

per/cli/CommandLineOption.class package org.apache.maven.wrapper.cli; public synchronized class CommandLineOption { private final java.util.Set options; private Class argumentType; private String description; private String subcommand; private String deprecationWarning; private boolean incubating; public void CommandLineOption(Iterable); public java.util.Set getOptions(); public CommandLineOption hasArgument(); public CommandLineOption hasArguments(); public String getSubcommand(); public CommandLineOption...

    val rule = MockWebServerRule()
    val called = AtomicBoolean()
    val statement: Statement =
      rule.apply(
        object : Statement() {
          override fun evaluate() {
            called.set(true)
            rule.server
              .url("/")
              .toUrl()
              .openConnection()
              .connect()
          }
        },
        Description.EMPTY,
      )

@REM -----------------------------------------------------------------------------

@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
@echo off
@REM set title of command window
title %0
@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
@if "%MAVEN_BATCH_ECHO%"=="on" echo %MAVEN_BATCH_ECHO%

@setlocal

import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.ProjectBuildingException;

/**
 * Facade to select projects for a given set of pom.xml files.
 */
public interface ProjectsSelector {
    /**
     * Select Maven projects from a list of POM files.
     * @param files List of POM files.
     * @param request The {@link MavenExecutionRequest}

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