```console
$ fastapi dev main.py
```

But you would have to remember to pass the correct path every time you call the `fastapi` command.

Additionally, other tools might not be able to find it, for example the [VS Code Extension](editor-support.md) or [FastAPI Cloud](https://fastapicloud.com), so it is recommended to use the `entrypoint` in `pyproject.toml`.

## `fastapi dev` { #fastapi-dev }

	"EQ":  arm.C_SCOND_EQ,
	"NE":  arm.C_SCOND_NE,
	"CS":  arm.C_SCOND_HS,
	"HS":  arm.C_SCOND_HS,
	"CC":  arm.C_SCOND_LO,
	"LO":  arm.C_SCOND_LO,
	"MI":  arm.C_SCOND_MI,
	"PL":  arm.C_SCOND_PL,
	"VS":  arm.C_SCOND_VS,
	"VC":  arm.C_SCOND_VC,
	"HI":  arm.C_SCOND_HI,
	"LS":  arm.C_SCOND_LS,
	"GE":  arm.C_SCOND_GE,
	"LT":  arm.C_SCOND_LT,
	"GT":  arm.C_SCOND_GT,
	"LE":  arm.C_SCOND_LE,
	"AL":  arm.C_SCOND_NONE,

        Set<String> existingIndices = new HashSet<>();
        boolean useExistingIndicesSet = false;

        // Track document count calls to distinguish source vs backup
        private int getDocumentCountCallIndex = 0;

        // Track alias count calls to distinguish pre vs post rebuild
        private int getAliasCountCallIndex = 0;

        @Override
        public boolean createIndex(final String index, final String indexName) {

        // [main] WARNING org.apache.maven.cling.invoker.PlexusContainerCapsuleFactory - * Conflicting extension
        // eu.maveniverse.maven.mimir:extension3: /tmp/junit-191051426131307150/.mvn/extensions.xml:3 vs
        // /tmp/junit-16591192886395443631/.m2/extensions.xml:3
        // [main] WARNING org.apache.maven.cling.invoker.PlexusContainerCapsuleFactory -

			if s, err := schema.Parse(arg, stmt.DB.cacheStore, stmt.DB.NamingStrategy); err == nil {
				selectedColumns := map[string]bool{}
				if idx == 0 {
					for _, v := range args[1:] {
						if vs, ok := v.(string); ok {
							selectedColumns[vs] = true
						}
					}
				}
				restricted := len(selectedColumns) != 0

				switch reflectValue.Kind() {
				case reflect.Struct:
					for _, field := range s.Fields {

        // TODO: Pull out more of this configuration into the extension if it makes sense
        // TODO: in a typical project, this may need to be the regular javadoc task vs javadocAll

        var groovyPackageListBucket = project.getConfigurations().dependencyScope("groovyPackageListBucket");
        var groovyPackageListConf = project.getConfigurations().resolvable("groovyPackageList", conf -> {

			// empty or `madmin.Default`.
			writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAdminConfigLDAPNonDefaultConfigName), r.URL)
			return
		}
	}

	// Check that this is a valid Create vs Update API call.
	s := globalServerConfig.Clone()
	if apiErrCode := handleCreateUpdateValidation(s, subSys, cfgTarget, isUpdate); apiErrCode != ErrNone {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(apiErrCode), r.URL)

      }
    };

    abstract Map<Element, Element> create(Collection<Element> contents);
  }

  @Param({"5", "50", "500", "5000", "50000"})
  private int size;

  // TODO: look at exact (==) hits vs. equals() hits?
  @Param("0.9")
  private double hitRate;

  @Param("true")
  private boolean isUserTypeFast;

  // "" means no fixed seed
  @Param("")
  private SpecialRandom random;

而且，最好的方式是使用现有的标准。

因此，甚至在开发 **FastAPI** 前，我就花了几个月的时间研究 OpenAPI、JSON Schema、OAuth2 等规范。深入理解它们之间的关系、重叠及区别之处。

## 设计 { #design }

然后，我又花了一些时间从用户角度（使用 FastAPI 的开发者）设计了开发者 **API**。

同时，我还在最流行的 Python 代码编辑器中测试了很多思路，包括 PyCharm、VS Code、基于 Jedi 的编辑器。

根据最新 [Python 开发者调研报告](https://www.jetbrains.com/research/python-developers-survey-2018/#development-tools)显示，这几种编辑器覆盖了约 80% 的用户。

### 带路径的 `fastapi dev` { #fastapi-dev-with-path }

你也可以把文件路径传给 `fastapi dev` 命令，它会猜测要使用的 FastAPI 应用对象：

```console
$ fastapi dev main.py
```

但每次运行 `fastapi` 命令都需要记得传入正确的路径。

另外，其他工具可能找不到它，例如 [VS Code 扩展](editor-support.md) 或 [FastAPI Cloud](https://fastapicloud.com)，因此推荐在 `pyproject.toml` 中使用 `entrypoint`。

## `fastapi dev` { #fastapi-dev }

当你运行 `fastapi dev` 时，它将以开发模式运行。