import static java.lang.annotation.RetentionPolicy.CLASS;

import com.google.common.annotations.GwtCompatible;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * Annotates a "top-level" type-variable usage that takes its nullness from the type argument
 * supplied by the user of the class. For example, {@code Multiset.Entry.getElement()} returns

But in real cases, when implementing security, you would get more benefits from using the integrated [Security utilities (the next chapter)](../security/index.md){.internal-link target=_blank}.

///

## Dependencies errors and return values { #dependencies-errors-and-return-values }

You can use the same dependency *functions* you use normally.

<a href="https://github.com/mpdavis/python-jose" class="external-link" target="_blank">python-jose</a> erfordert zusätzlich ein kryptografisches Backend.

Hier verwenden wir das empfohlene: <a href="https://cryptography.io/" class="external-link" target="_blank">pyca/cryptography</a>.

/// tip | Tipp

Dieses Tutorial verwendete zuvor <a href="https://pyjwt.readthedocs.io/" class="external-link" target="_blank">PyJWT</a>.

Si quieres jugar con tokens JWT y ver cómo funcionan, revisa <a href="https://jwt.io/" class="external-link" target="_blank">https://jwt.io</a>.

## Instalar `PyJWT`

Necesitamos instalar `PyJWT` para generar y verificar los tokens JWT en Python.

Asegúrate de crear un [entorno virtual](../../virtual-environments.md){.internal-link target=_blank}, activarlo y luego instalar `pyjwt`:

<div class="termy">

```console
$ pip install pyjwt

				default:
					err = dc.Skip()
					if err != nil {
						err = msgp.WrapError(err, "Flags")
						return
					}
				}
			}
		case "Target":
			err = z.Target.DecodeMsg(dc)
			if err != nil {
				err = msgp.WrapError(err, "Target")
				return
			}
		case "Source":
			err = z.Source.DecodeMsg(dc)
			if err != nil {
				err = msgp.WrapError(err, "Source")
				return
			}

Thông tin này sẽ hữu ích khi bạn học về [Môi trường ảo](virtual-environments.md){.internal-link target=_blank}.

## Kết luận

Với những thông tin này, bạn có thể hiểu được **các biến môi trường là gì** và **cách sử dụng chúng trong Python**.

Bạn có thể đọc thêm về chúng tại <a href="https://en.wikipedia.org/wiki/Environment_variable" class="external-link" target="_blank">Wikipedia cho Biến môi trường</a>.

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Signifies that a public API (public class, method or field) is subject to incompatible changes,
 * or even removal, in a future release. An API bearing this annotation is exempt from any

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Signifies that a public API (public class, method or field) is subject to incompatible changes,
 * or even removal, in a future release. An API bearing this annotation is exempt from any

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * A type implemented by, or extended by maven plugins or extensions.
 * Maven plugins or extensions may provide implementations of those types which will be used by maven.
 * <p>

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* Traefik (👈 💪 🍵 📄 🔕)
* 📥 (👈 💪 🍵 📄 🔕)
* 👌
* ✳

## ➡️ 🗜

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🛠️ 📎 1️⃣ 👫 📄 ⚙️ ⚠, 🚚 📠 & 📄 😥.

✋️ ⤴️ **<a href="https://letsencrypt.org/" class="external-link" target="_blank">➡️ 🗜</a>** ✍.