```

</div>

///

この情報は、[Virtual Environments](virtual-environments.md) について学ぶ際にも役立ちます。

## まとめ

これで、**環境変数**とは何か、Pythonでどのように使用するかについて、基本的な理解が得られたはずです。

環境変数についての詳細は、<a href="https://en.wikipedia.org/wiki/Environment_variable" class="external-link" target="_blank">Wikipedia: Environment Variable</a> を参照してください。

環境変数の用途や適用方法が最初は直感的ではないかもしれませんが、開発中のさまざまなシナリオで繰り返し登場します。そのため、基本を知っておくことが重要です。

      fun run() {
        val formBody = FormBody.Builder()
            .add("search", "Jurassic Park")
            .build()
        val request = Request.Builder()
            .url("https://en.wikipedia.org/w/index.php")
            .post(formBody)
            .build()

        client.newCall(request).execute().use { response ->
          if (!response.isSuccessful) throw IOException("Unexpected code $response")

  }

  /**
   * Returns every possible list that can be formed by choosing one element from each of the given
   * lists in order; the "n-ary <a href="http://en.wikipedia.org/wiki/Cartesian_product">Cartesian
   * product</a>" of the lists. For example:
   *
   * {@snippet :
   * Lists.cartesianProduct(ImmutableList.of(
   *     ImmutableList.of(1, 2),

* Naprawić literówkę, którą znalazłeś w dokumentacji.
* Podzielić się artykułem, filmem lub podcastem, który stworzyłeś lub znalazłeś na temat FastAPI, <a href="https://github.com/fastapi/fastapi/edit/master/docs/en/data/external_links.yml" class="external-link" target="_blank">edytując ten plik</a>.
    * Upewnij się, że dodajesz swój link na początku odpowiedniej sekcji.

For production you would probably use a migration script that runs before you start your app. 🤓

/// tip

SQLModel will have migration utilities wrapping Alembic, but for now, you can use <a href="https://alembic.sqlalchemy.org/en/latest/" class="external-link" target="_blank">Alembic</a> directly.

///

### Create a Hero { #create-a-hero }

```console
$ pip install pyjwt

---> 100%
```

</div>

/// info | 참고

RSA나 ECDSA 같은 전자 서명 알고리즘을 사용하려면, `pyjwt[crypto]`라는 암호화 라이브러리 의존성을 설치해야 합니다.

더 자세한 내용은 <a href="https://pyjwt.readthedocs.io/en/latest/installation.html" class="external-link" target="_blank">PyJWT 설치</a> 에서 확인할 수 있습니다.

///

## 패스워드 해싱

"해싱(Hashing)"은 어떤 내용(여기서는 패스워드)을 해석할 수 없는 일련의 바이트 집합(단순 문자열)으로 변환하는 것을 의미합니다.

      builder.append(separator).append(array[i]);
    }
    return builder.toString();
  }

  /**
   * Returns a comparator that compares two {@code char} arrays <a
   * href="http://en.wikipedia.org/wiki/Lexicographical_order">lexicographically</a>; not advisable
   * for sorting user-visible strings as the ordering may not match the conventions of the user's

      builder.append(separator).append(array[i]);
    }
    return builder.toString();
  }

  /**
   * Returns a comparator that compares two {@code short} arrays <a
   * href="http://en.wikipedia.org/wiki/Lexicographical_order">lexicographically</a>. That is, it
   * compares, using {@link #compare(short, short)}), the first pair of values that follow any

      builder.append(separator).append(array[i]);
    }
    return builder.toString();
  }

  /**
   * Returns a comparator that compares two {@code short} arrays <a
   * href="http://en.wikipedia.org/wiki/Lexicographical_order">lexicographically</a>. That is, it
   * compares, using {@link #compare(short, short)}), the first pair of values that follow any

import com.google.errorprone.annotations.DoNotMock;
import java.util.Optional;
import java.util.Set;
import org.jspecify.annotations.Nullable;

/**
 * An interface for <a
 * href="https://en.wikipedia.org/wiki/Graph_(discrete_mathematics)">graph</a>-structured data,
 * whose edges are <a
 * href="https://github.com/google/guava/wiki/GraphsExplained#uniqueness">unique</a> objects.
 *