{* ../../docs_src/python_types/tutorial005_py39.py hl[1] *}

### Generic types with type parameters { #generic-types-with-type-parameters }

There are some data structures that can contain other values, like `dict`, `list`, `set` and `tuple`. And the internal values can have their own type too.

These types that have internal types are called "**generic**" types. And it's possible to declare them, even with their internal types.

   *       byte is then represented by the 3-character string "%XY", where "XY" is the two-digit,
   *       uppercase, hexadecimal representation of the byte value.
   * </ul>
   *
   * <p>This escaper is suitable for escaping parameter names and values even when <a
   * href="https://www.w3.org/TR/html401/appendix/notes.html#h-B.2.2">using the non-standard

  @CollectionSize.Require(SEVERAL)
  public void testRemovePresentConcurrentWithValuesIteration() {
    assertThrows(
        ConcurrentModificationException.class,
        () -> {
          Iterator<V> iterator = getMap().values().iterator();
          getMap().remove(k0());
          iterator.next();
        });
  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_notPresent() {

    tasksFinished.await();

    // Check all of the removal notifications we received: they should have had correctly-associated
    // keys and values. (An earlier bug saw removal notifications for in-progress computations,
    // which had real keys with null values.)
    Map<String, String> removalNotifications = new HashMap<>();
    for (RemovalNotification<String, String> notification : listener) {

	psqlCreateAccessTable    = `CREATE TABLE %s (event_time TIMESTAMP WITH TIME ZONE NOT NULL, event_data JSONB);`

	psqlUpdateRow = `INSERT INTO %s (key, value) VALUES ($1, $2) ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value;`
	psqlDeleteRow = `DELETE FROM %s WHERE key = $1;`
	psqlInsertRow = `INSERT INTO %s (event_time, event_data) VALUES ($1, $2);`
)

// Postgres constants

      }
    }
  }

  /** Read a value as bytes without interpretation of its contents. */
  fun readUnknown(): ByteString = source.readByteString(bytesLeft)

  override fun toString(): String = path.joinToString(separator = " / ")

  companion object {
    /**
     * A synthetic value that indicates there's no more bytes. Values with equivalent data may also

//       olderThan: 70h # match objects older than this value
//       createdBefore: "2006-01-02T15:04:05.00Z" # match objects created before "date"
//       tags:
//         - key: name
//           value: pick* # match objects with tag 'name', all values starting with 'pick'
//       metadata:
//         - key: content-type
//           value: image/* # match objects with 'content-type', all values starting with 'image/'
//       size:

    public String getSimilarDocHash() {
        return sdh;
    }

    @Override
    public String getTrackTotalHits() {
        final String value = ComponentUtil.getFessConfig().getPageSearchlistTrackTotalHits();
        if (StringUtil.isNotBlank(value)) {
            return value;
        }
        return null;
    }

        // Verify that the getters return the correct values
        assertEquals(length, pacString.getLength(), "The length should match the value provided in the constructor.");
        assertEquals(maxLength, pacString.getMaxLength(), "The maxLength should match the value provided in the constructor.");
        assertEquals(pointer, pacString.getPointer(), "The pointer should match the value provided in the constructor.");
    }

    /**

	}

	switch funcName {
	case aggFnCount:
		// For all non-null values, the count is incremented.
		e.aggregate.runningCount++

	case aggFnAvg, aggFnSum:
		e.aggregate.runningCount++
		// Convert to float.
		f, ok := argVal.ToFloat()
		if !ok {
			return fmt.Errorf("Could not convert value %v (%s) to a number", argVal.value, argVal.GetTypeString())
		}
		argVal.setFloat(f)