lt=lt,
            le=le,
            min_length=min_length,
            max_length=max_length,
            discriminator=discriminator,
            multiple_of=multiple_of,
            allow_nan=allow_inf_nan,
            max_digits=max_digits,
            decimal_places=decimal_places,
            **extra,
        )
        if examples is not None:
            kwargs["examples"] = examples

Flask is a "microframework", it doesn't include database integrations nor many of the things that come by default in Django.

This simplicity and flexibility allow doing things like using NoSQL databases as the main data storage system.

As it is very simple, it's relatively intuitive to learn, although the documentation gets somewhat technical at some points.

Вполне вероятно, что вы увидите несколько процессов с одним и тем же названием браузерной программы (Firefox, Chrome, Edge и т. Д.). Обычно браузеры запускают один процесс на вкладку и вдобавок некоторые дополнительные процессы.

<img class="shadow" src="/img/deployment/concepts/image01.png">

---

Теперь, когда нам известна разница между **процессом** и **программой**, давайте продолжим обсуждение развёртывания.

## Настройки запуска приложения

OSの「タスク・マネージャー」や「システム・モニター」（または同様のツール）を確認すれば、これらのプロセスの多くが実行されているの見ることができるでしょう。

例えば、同じブラウザプログラム（Firefox、Chrome、Edgeなど）を実行しているプロセスが複数あることがわかります。通常、1つのタブにつき1つのプロセスが実行され、さらに他のプロセスも実行されます。

<img class="shadow" src="/img/deployment/concepts/image01.png">

---

さて、**プロセス**と**プログラム**という用語の違いを確認したところで、デプロイメントについて話を続けます。

## 起動時の実行

    github_sponsors_old_content = github_sponsors_path.read_text(encoding="utf-8")
    new_people_content = yaml.dump(
        people, sort_keys=False, width=200, allow_unicode=True
    )
    new_github_sponsors_content = yaml.dump(
        github_sponsors, sort_keys=False, width=200, allow_unicode=True
    )
    if (
        people_old_content == new_people_content
        and github_sponsors_old_content == new_github_sponsors_content

And, for example, you will probably see that there are multiple processes running the same browser program (Firefox, Chrome, Edge, etc). They normally run one process per tab, plus some other extra processes.

<img class="shadow" src="/img/deployment/concepts/image01.png">

---

Now that we know the difference between the terms **process** and **program**, let's continue talking about deployments.

## Running on Startup

Create a PassLib "context". This is what will be used to hash and verify passwords.

!!! tip
    The PassLib context also has functionality to use different hashing algorithms, including deprecated old ones only to allow verifying them, etc.

    For example, you could use it to read and verify passwords generated by another system (like Django) but hash any new passwords with a different algorithm like Bcrypt.

# Python Types Intro

Python has support for optional "type hints" (also called "type annotations").

These **"type hints"** or annotations are a special syntax that allow declaring the <abbr title="for example: str, int, float, bool">type</abbr> of a variable.

By declaring types for your variables, editors and tools can give you better support.

    <diagram id="jyERGzDynktFHFRGN0ph" name="Page-1">
        <mxGraphModel dx="3321" dy="2867" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="1920" pageHeight="1200" math="0" shadow="0">
            <root>
                <mxCell id="0"/>
                <mxCell id="1" parent="0"/>
                <mxCell id="2" value="" style="rounded=0;whiteSpace=wrap;html=1;fontStyle=1;strokeWidth=4;" parent="1" vertex="1">

!!! note
    FastAPI will know that the value of `q` is not required because of the default value `= None`.

    The `Union` in `Union[str, None]` will allow your editor to give you better support and detect errors.

## Additional validation

We are going to enforce that even though `q` is optional, whenever it is provided, **its length doesn't exceed 50 characters**.