[[dev_introduction]]
= Getting Started

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## Install `PyJWT`

We need to install `PyJWT` to generate and verify the JWT tokens in Python:

<div class="termy">

```console
$ pip install pyjwt

---> 100%
```

</div>

!!! info
    If you are planning to use digital signature algorithms like RSA or ECDSA, you should install the cryptography library dependency `pyjwt[crypto]`.

There are utilities to configure it easily that you can use directly in your **FastAPI** application (provided by Starlette).

## Install dependencies

Install `jinja2`:

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```console
$ pip install jinja2

---> 100%
```

</div>

## Using `Jinja2Templates`

* Import `Jinja2Templates`.
* Create a `templates` object that you can reuse later.

# 模板

**FastAPI** 支持多种模板引擎。

Flask 等工具使用的 Jinja2 是最用的模板引擎。

在 Starlette 的支持下，**FastAPI** 应用可以直接使用工具轻易地配置 Jinja2。

## 安装依赖项

安装 `jinja2`：

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```console
$ pip install jinja2

---> 100%
```

</div>

## 使用 `Jinja2Templates`

* 导入 `Jinja2Templates`
* 创建可复用的 `templates` 对象
* 在返回模板的*路径操作*中声明 `Request` 参数

	"CLZ",
	"CMPEQD",
	"CMPEQF",
	"CMPGED",
	"CMPGEF",
	"CMPGTD",
	"CMPGTF",
	"LU12IW",
	"LU32ID",
	"LU52ID",
	"PCALAU12I",
	"PCADDU12I",
	"JIRL",
	"BGE",
	"BLT",
	"BLTU",
	"BGEU",
	"DIV",
	"DIVD",
	"DIVF",
	"DIVU",
	"DIVW",
	"LL",
	"LLV",
	"LUI",
	"MOVB",
	"MOVBU",
	"MOVD",
	"MOVDF",
	"MOVDW",
	"MOVF",
	"MOVFD",
	"MOVFW",
	"MOVH",
	"MOVHU",
	"MOVW",

To run your FastAPI app for development, you can use the `fastapi dev` command:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:single">main.py</u>
<font color="#3465A4">INFO    </font> Using path <font color="#3465A4">main.py</font>

Para rodar seu app FastAPI em desenvolvimento, você pode usar o comando `fastapi dev`:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:single">main.py</u>
<font color="#3465A4">INFO    </font> Using path <font color="#3465A4">main.py</font>

    history.pushState('', '', url.toString()); // Makes back-button work
    matches = new Set();
    search.value = '';
    render();
  }

  function handleEnter(box, div) {
    if (actionMenuOn) return;
    const src = stacks.Sources[box.src];
    div.title = details(box) + ' │ ' + src.FullName + (src.Inlined ? "\n(inlined)" : "");
    detailBox.innerText = summary(box.sumpos, box.sumneg);

        configurationCacheReport != null

        and:
        def pageErrors = []
        def activeGroup = selectInnerTextOf(
            configurationCacheReport,
            "div.group-selector.group-selector--active",
            { pageErrors.add(it) }
        )
        pageErrors == []
        activeGroup == "Problems grouped by message1"
    }

def LowerTruncateDivOpOnFloatTensors : Pat<
  (TF_TruncateDivOp TF_FloatTensor:$lhs, $rhs),
  (TF_SelectV2Op
    (TF_LessOp
      (TF_DivOp:$div $lhs, $rhs),
      (TF_ConstOp:$zero (GetScalarOfFloatType<"0.0"> $lhs))
    ),
    (TF_CeilOp $div),
    (TF_FloorOp $div)
  )>;

//===----------------------------------------------------------------------===//
// Fill op patterns.