## 上下文管理器 { #context-managers }

### 什么是“上下文管理器” { #what-are-context-managers }

“上下文管理器”是你可以在 `with` 语句中使用的任意 Python 对象。

例如，[你可以用 `with` 来读取文件](https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files)：

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

在底层，`open("./somefile.txt")` 会创建一个“上下文管理器”对象。

        "darwin"  | "x64"     | VENDOR_OPENJDK      | OPEN_JDK_VERSION     | "Contents/Home/bin/java" | ""
        "darwin"  | "x64"     | VENDOR_OPENJDK      | OPENJDK_VERSION_OLD  | "Contents/Home/bin/java" | "(old version)"
        "mac"     | "x64"     | VENDOR_OPENJDK      | OPEN_JDK_VERSION     | "Contents/Home/bin/java" | ""

    }

    /**
     * Returns the class loader.
     * <p>
     * The class loader is searched in the following order:
     * </p>
     * <ol>
     * <li>If the context class loader is set for the calling thread, that context class loader</li>
     * <li>If the class loader that loaded the target class can be obtained, that class loader</li>

// checkObjectWithAllParts sets partsMetadata and onlineDisks when xl.meta is inexistant/corrupted or outdated
// it also checks if the status of each part (corrupted, missing, ok) in each drive
func checkObjectWithAllParts(ctx context.Context, onlineDisks []StorageAPI, partsMetadata []FileInfo,
	errs []error, latestMeta FileInfo, filterByETag bool, bucket, object string,
	scanMode madmin.HealScanMode,
) (dataErrsByDisk map[int][]int, dataErrsByPart map[int][]int) {

      // Oracle JDK. Note that we don't support HTTP/2 or other nice features on Robolectric.
      val sslContextClass = Class.forName("sun.security.ssl.SSLContextImpl")
      val context = readFieldOrNull(sslSocketFactory, sslContextClass, "context") ?: return null
      readFieldOrNull(context, X509TrustManager::class.java, "trustManager")
    } catch (e: ClassNotFoundException) {
      null
    } catch (e: RuntimeException) {

        @Test
        public void testConstructorWithContextAndName() throws Exception {
            // Test constructor that takes a context SmbFile and a name
            SmbFile context = new SmbFile("smb1://server/share/");
            String name = "file.txt";
            SmbFile smbFile = new SmbFile(context, name);
            assertEquals("smb1://server/share/file.txt", smbFile.getCanonicalPath());
        }

        @Test

//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"bytes"
	"context"
	"errors"
	"hash"
	"io"
	"sync"

	xhttp "github.com/minio/minio/internal/http"
	"github.com/minio/minio/internal/ioutil"
	"github.com/minio/minio/internal/ringbuffer"
)

                "/a": {
                    "get": {
                        "responses": {
                            "500": {
                                "description": "Error",
                                "content": {
                                    "application/vnd.api+json": {
                                        "schema": {
                                            "$ref": "#/components/schemas/JsonApiError"

@NullUnmarked
public final class SetsFilterSortedSetTest
    extends AbstractFilteredSortedSetTest<SortedSet<Integer>> {
  @Override
  SortedSet<Integer> createUnfiltered(Iterable<Integer> contents) {
    TreeSet<Integer> result = Sets.newTreeSet(contents);
    // we have to make the result not Navigable
    return new ForwardingSortedSet<Integer>() {
      @Override
      protected SortedSet<Integer> delegate() {
        return result;

				} else {
					logger.Default.Warn(context.Background(), "In model %v, the hook function `%v(*gorm.DB) error` has an incorrect parameter type. The expected parameter type is `%v`, but the provided type is `%v`.", schema, cbName, expectedPkgPath, inVarPkg)
					// PASS
				}
			default: