# Giới thiệu kiểu dữ liệu Python

Python hỗ trợ tùy chọn "type hints" (còn được gọi là "type annotations").

Những **"type hints"** hay chú thích là một cú pháp đặc biệt cho phép khai báo <abbr title="ví dụ: str, int, float, bool"> kiểu dữ liệu</abbr> của một biến.

Bằng việc khai báo kiểu dữ liệu cho các biến của bạn, các trình soạn thảo và các công cụ có thể hỗ trợ bạn tốt hơn.

package com.google.common.collect.testing;

import static com.google.common.collect.testing.DerivedCollectionGenerators.keySetGenerator;
import static com.google.common.collect.testing.Helpers.copyToSet;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.DerivedCollectionGenerators.MapEntrySetGenerator;
import com.google.common.collect.testing.DerivedCollectionGenerators.MapValueCollectionGenerator;

Помните, как ранее я говорил об Annotated? Он может быть использован для добавления метаданных для ваших параметров в разделе [Введение в аннотации типов Python](../python-types.md#type-hints-with-metadata-annotations){.internal-link target=_blank}?

Пришло время использовать их в FastAPI. 🚀

У нас была аннотация следующего типа:

//// tab | Python 3.10+

```Python
q: str | None = None
```

////

```JSON
{"item_id":"foo"}
```

## Path parameters with types

You can declare the type of a path parameter in the function, using standard Python type annotations:

```Python hl_lines="7"
{!../../docs_src/path_params/tutorial002.py!}
```

In this case, `item_id` is declared to be an `int`.

/// check

		if ec := c.cfg.InitExitCode; ec == 0 || ec == int(state.ExitCode) {
			return true
		}
		return false
	}

	// Only check pods that have the sidecar annotation; the rest can be
	// ignored.
	if c.cfg.SidecarAnnotation != "" {
		if _, ok := pod.ObjectMeta.Annotations[c.cfg.SidecarAnnotation]; !ok {
			return false
		}
	}

	// For each candidate pod, iterate across all init containers searching for

import org.apache.maven.api.ProducedArtifact;
import org.apache.maven.api.Project;
import org.apache.maven.api.ProjectScope;
import org.apache.maven.api.RemoteRepository;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.di.SessionScoped;
import org.apache.maven.api.model.Resource;
import org.apache.maven.api.services.ArtifactManager;
import org.apache.maven.api.services.ProjectManager;

 * the License.
 */

package com.google.common.hash;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

/**
 * A convenience base class for implementors of {@code Hasher}; handles accumulating data until an

import static java.util.Collections.emptyList;
import static java.util.Collections.emptySet;
import static java.util.Collections.singletonList;
import static java.util.Collections.unmodifiableList;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.ListFeature;

import static com.google.common.collect.Lists.newArrayList;
import static com.google.common.collect.testing.IteratorFeature.MODIFIABLE;
import static java.util.Collections.emptyList;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;

 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.xml;

import com.google.common.annotations.GwtCompatible;
import com.google.common.escape.Escaper;
import com.google.common.escape.Escapers;

/**
 * {@code Escaper} instances suitable for strings to be included in XML attribute values and