```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

Под капотом" open("./somefile.txt") создаёт объект называемый "контекстным менеджером".

Когда блок `with` завершается, он обязательно закрывает файл, даже если были исключения.

            this.variantAttributes = variantAttributes;
            this.dependencyMetadata = dependencyMetadata;
            artifact = new DefaultResolvableArtifact(null, DefaultIvyArtifactName.forFile(file, null), this.artifactIdentifier, this.dependencyMetadata.getFiles(), calculatedValueContainerFactory.create(Describables.of(artifactIdentifier), file), calculatedValueContainerFactory);
        }

        @Override

```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

その後の`open("./somefile.txt")`は「コンテキストマネージャ」と呼ばれるオブジェクトを作成します。

`with`ブロックが終了すると、例外があったとしてもファイルを確かに閉じます。

`yield`を依存関係を作成すると、**FastAPI** は内部的にそれをコンテキストマネージャに変換し、他の関連ツールと組み合わせます。

                                }

                                @Override
                                public IvyArtifactName getArtifactName() {
                                    return DefaultIvyArtifactName.forFile(file, null);
                                }

                                @Override
                                public File getFile() {
                                    return file;

                        }
                    }
                }
            }
        '''
        // Non-empty source set to trigger the corresponding task
        file('src/main/someLang/somefile.someLang').text = ""

        when:
        succeeds "printBinaryTaskNames"

        then:
        output.contains "names: [customMainB1MainSomeLang]"
    }

    def "error message contains spec which failed to evaluate"() {
        given:
        buildFile << """
            task adHocTask {
                inputs.property("input") { true }
                outputs.file("someFile")
                outputs.cacheIf("on CI") { throw new RuntimeException() }
                doLast {
                    println "Success"
                }
            }
        """

        when:

    }

    /**
     * Creates a directory structure specified by the given closure.
     * <pre>
     * dir.create {
     *     subdir1 {
     *        file 'somefile.txt'
     *     }
     *     subdir2 { nested { file 'someFile' } }
     * }
     * </pre>
     */
    public TestFile create(@DelegatesTo(value = TestWorkspaceBuilder.class, strategy = Closure.DELEGATE_FIRST) Closure structure) {

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Provides utility methods for working with {@linkplain File files}.
 *
 * <p>{@link java.nio.file.Path} users will find similar utilities in {@link MoreFiles} and the
 * JDK's {@link java.nio.file.Files} class.
 *
 * @author Chris Nokleberg
 * @author Colin Decker
 * @since 1.0
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Provides utility methods for working with {@linkplain File files}.
 *
 * <p>{@link java.nio.file.Path} users will find similar utilities in {@link MoreFiles} and the
 * JDK's {@link java.nio.file.Files} class.
 *
 * @author Chris Nokleberg
 * @author Colin Decker
 * @since 1.0
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault

        task instanceof DefaultTask
        task dependsOn(JvmConstants.TEST_TASK_NAME)

        when:
        project.sourceSets.main.java.srcDirs(temporaryFolder.getTestDirectory())
        temporaryFolder.file("SomeFile.java").touch()
        task = project.tasks[JvmConstants.JAVADOC_TASK_NAME]

        then:
        task instanceof Javadoc
        task dependsOn(JvmConstants.CLASSES_TASK_NAME, JvmConstants.COMPILE_JAVA_TASK_NAME)