</div>

/// info

パッケージの依存関係を定義しインストールするためのフォーマットやツールは他にもあります。

Poetryを使った例は、後述するセクションでご紹介します。👇

///

### **FastAPI**コードを作成する

* `app` ディレクトリを作成し、その中に入ります
* 空のファイル `__init__.py` を作成します
* `main.py` ファイルを作成します：

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}

<div class="termy">

```console
$ cd ~/code/prisoner-of-azkaban

$ python main.py

// 匯入 sirius 錯誤，未安裝 😱
Traceback (most recent call last):
    File "main.py", line 1, in <module>
        import sirius
```

</div>

但如果你停用虛擬環境並啟用 `prisoner-of-askaban` 的新虛擬環境，那麼當你執行 `python` 時，它會使用 `prisoner-of-askaban` 中虛擬環境的 Python。

<div class="termy">

```console
$ cd ~/code/prisoner-of-azkaban

$ python main.py

// Lỗi khi import sirius, nó không được cài đặt 😱
Traceback (most recent call last):
    File "main.py", line 1, in <module>
        import sirius
```

</div>

[19515] [INFO] Waiting for application startup.
[19515] [INFO] Application startup complete.
```

</div>

➡️ 👀 ⚫️❔ 🔠 👈 🎛 ⛓:

* `main:app`: 👉 🎏 ❕ ⚙️ Uvicorn, `main` ⛓ 🐍 🕹 📛 "`main`",, 📁 `main.py`. &amp; `app` 📛 🔢 👈 **FastAPI** 🈸.
    * 👆 💪 🌈 👈 `main:app` 🌓 🐍 `import` 📄 💖:

        ```Python
        from main import app
        ```

    * , ❤ `main:app` 🔜 🌓 🐍 `import` 🍕 `from main import app`.

* 생성한 `templates`를 사용하여 `TemplateResponse`를 렌더링하고 반환합니다. 템플릿의 이름, 요청 객체 및 Jinja2 템플릿 내에서 사용될 키-값 쌍이 포함된 "컨텍스트" 딕셔너리도 전달합니다.


```Python hl_lines="4  11  15-18"
{!../../docs_src/templates/tutorial001.py!}
```

/// note | 참고

FastAPI 0.108.0 이전과 Starlette 0.29.0에서는 `name`이 첫 번째 매개변수였습니다.

또한 이전 버전에서는 `request` 객체가 Jinja2의 컨텍스트에서 키-값 쌍의 일부로 전달되었습니다.

///

/// tip | 팁

#
# This file is autogenerated by pip-compile with Python 3.10
# by the following command:
#
#    bazel run //ci/official/requirements_updater:requirements.update
#
absl-py==2.2.2 \
    --hash=sha256:bf25b2c2eed013ca456918c453d687eab4e8309fba81ee2f4c1a6aa2494175eb \
    --hash=sha256:e5797bc6abe45f64fd95dc06394ca3f2bedf3b5d895e9da691c9ee3397d70092
    # via
    #   keras-nightly
    #   tb-nightly
astor==0.7.1 \

#
# This file is autogenerated by pip-compile with Python 3.9
# by the following command:
#
#    bazel run //ci/official/requirements_updater:requirements.update
#
absl-py==2.2.2 \
    --hash=sha256:bf25b2c2eed013ca456918c453d687eab4e8309fba81ee2f4c1a6aa2494175eb \
    --hash=sha256:e5797bc6abe45f64fd95dc06394ca3f2bedf3b5d895e9da691c9ee3397d70092
    # via
    #   keras-nightly
    #   tb-nightly
astor==0.7.1 \

#
# This file is autogenerated by pip-compile with Python 3.11
# by the following command:
#
#    bazel run //ci/official/requirements_updater:requirements.update
#
absl-py==2.2.2 \
    --hash=sha256:bf25b2c2eed013ca456918c453d687eab4e8309fba81ee2f4c1a6aa2494175eb \
    --hash=sha256:e5797bc6abe45f64fd95dc06394ca3f2bedf3b5d895e9da691c9ee3397d70092
    # via
    #   keras-nightly
    #   tb-nightly
astor==0.7.1 \

#
# This file is autogenerated by pip-compile with Python 3.9
# by the following command:
#
#    bazel run //ci/official/requirements_updater:requirements.update
#
absl-py==2.2.2 \
    --hash=sha256:bf25b2c2eed013ca456918c453d687eab4e8309fba81ee2f4c1a6aa2494175eb \
    --hash=sha256:e5797bc6abe45f64fd95dc06394ca3f2bedf3b5d895e9da691c9ee3397d70092
    # via
    #   keras-nightly
    #   tb-nightly
astor==0.7.1 \

  stars: 2196
  owner_login: codingforentrepreneurs
  owner_html_url: https://github.com/codingforentrepreneurs
- name: supabase-py
  html_url: https://github.com/supabase/supabase-py
  stars: 2194
  owner_login: supabase
  owner_html_url: https://github.com/supabase
- name: langserve
  html_url: https://github.com/langchain-ai/langserve
  stars: 2157