### Virtual environment with `venv`

You can create an isolated virtual local environment in a directory using Python's `venv` module. Let's do this in the cloned repository (where the `requirements.txt` is):

<div class="termy">

```console
$ python -m venv env
```

</div>

That will create a directory `./env/` with the Python binaries, and then you will be able to install packages for that local environment.

## Details

The first `"/static"` refers to the sub-path this "sub-application" will be "mounted" on. So, any path that starts with `"/static"` will be handled by it.

The `directory="static"` refers to the name of the directory that contains your static files.

The `name="static"` gives it a name that can be used internally by **FastAPI**.

from fastapi.responses import HTMLResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates

app = FastAPI()

app.mount("/static", StaticFiles(directory="static"), name="static")


templates = Jinja2Templates(directory="templates")


@app.get("/items/{id}", response_class=HTMLResponse)
async def read_item(request: Request, id: str):
    return templates.TemplateResponse(

│       └── admin.py
```

!!! tip
    There are several `__init__.py` files: one in each directory or subdirectory.

    This is what allows importing code from one file into another.

    For example, in `app/main.py` you could have a line like:

    ```
    from app.routers import items
    ```

    This allows you to use `pytest` directly without complications.

!!! note "Technical Details"
    You could also use `from starlette.testclient import TestClient`.

    **FastAPI** provides the same `starlette.testclient` as `fastapi.testclient` just as a convenience for you, the developer. But it comes directly from Starlette.

!!! tip

✅ ⚫️ 👷, ⚙️:

=== "💾, 🇸🇻, 🚪 🎉"

    <div class="termy">

    ```console
    $ which pip

    some/directory/fastapi/env/bin/pip
    ```

    </div>

=== "🚪 📋"

    <div class="termy">

    ```console
    $ Get-Command pip

    some/directory/fastapi/env/bin/pip
    ```

    </div>

🚥 ⚫️ 🎦 `pip` 💱 `env/bin/pip` ⤴️ ⚫️ 👷. 👶

    get_redoc_html,
    get_swagger_ui_html,
    get_swagger_ui_oauth2_redirect_html,
)
from fastapi.staticfiles import StaticFiles

app = FastAPI(docs_url=None, redoc_url=None)

app.mount("/static", StaticFiles(directory="static"), name="static")


@app.get("/docs", include_in_schema=False)
async def custom_swagger_ui_html():
    return get_swagger_ui_html(
        openapi_url=app.openapi_url,

자세한 내용은 **숙련된 사용자 안내서**에서 확인할 수 있습니다.

## 세부사항

첫 번째 `"/static"`은 이 "하위 응용 프로그램"이 "마운트"될 하위 경로를 가리킵니다. 따라서 `"/static"`으로 시작하는 모든 경로는 `"/static"`으로 처리됩니다.

`'directory="static"`은 정적 파일이 들어 있는 디렉토리의 이름을 나타냅니다.

`name="static"`은 **FastAPI**에서 내부적으로 사용할 수 있는 이름을 제공합니다.

이 모든 매개변수는 "`static`"과 다를 수 있으며, 사용자 응용 프로그램의 요구 사항 및 구체적인 세부 정보에 따라 매개변수를 조정할 수 있습니다.


## 추가 정보

=== "Linux, macOS, Windows Bash"

    <div class="termy">

    ```console
    $ which pip

    some/directory/fastapi/env/bin/pip
    ```

    </div>

=== "Windows PowerShell"

    <div class="termy">

    ```console
    $ Get-Command pip

    some/directory/fastapi/env/bin/pip
    ```

    </div>

Se ele exibir o binário `pip` em `env/bin/pip` então funcionou. 🎉

7. Set the current working directory to `/code`.

8. Copy the `requirements.txt` file to the `/code` directory.

    This file only lives in the previous Docker stage, that's why we use `--from-requirements-stage` to copy it.

9. Install the package dependencies in the generated `requirements.txt` file.

10. Copy the `app` directory to the `/code` directory.

11. Use the `fastapi run` command to run your app.