from fastapi import FastAPI

app = FastAPI()


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


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

### Dockerfile

Erstellen Sie nun im selben Projektverzeichnis eine Datei `Dockerfile` mit:

```{ .dockerfile .annotate }
# (1)
FROM python:3.9

labels.crawler_title_edit=General Config
labels.schedule=Schedule
labels.enabled=Enabled
labels.day_for_cleanup=Delete old documents
labels.day=days
labels.crawl_button_update=Update
labels.none=None
labels.crawling_thread_count=Concurrent Crawler Config
labels.incremental_crawling=Check Last Modified
labels.search_log_enabled=Search Log
labels.user_info_enabled=User Log
labels.user_favorite_enabled=Favorite Log

print(f"Hello {name} from Python")
```

/// tip

<a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> の第2引数は、デフォルトで返される値を指定します。

この引数を省略するとデフォルト値として`None`が返されますが、ここではデフォルト値として`"World"`を指定しています。

///

次に、このPythonプログラムを呼び出します。

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// Here we don't set the env var yet
$ python main.py

from fastapi import FastAPI

app = FastAPI()


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


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

### Dockerfile

В этой же директории создайте файл `Dockerfile` и заполните его:

```{ .dockerfile .annotate }
# (1)
FROM python:3.9

// It returns the byte index in s of the first Unicode
// code point satisfying f(c), or -1 if none do.
func IndexFunc(s []byte, f func(r rune) bool) int {
	return indexFunc(s, f, true)
}

// LastIndexFunc interprets s as a sequence of UTF-8-encoded code points.
// It returns the byte index in s of the last Unicode
// code point satisfying f(c), or -1 if none do.
func LastIndexFunc(s []byte, f func(r rune) bool) int {

     * must be one of "trace", "debug", "info", "warn", "error" or "off". When a logger named "a.b.c" is initialized,
     * its level is assigned from this property. If unspecified, the level of nearest parent logger will be used,
     * and if none is set, then the value specified by {@code maven.logger.defaultLogLevel} will be used.
     *
     * @since 4.0.0

hasRun?this.result:(f=a,g.haltValidation(this.$form),this.haltedFormValidation=!0,this.isRunning=!0,this.$input.attr("disabled","disabled").addClass("async-validation"),this.$form.addClass("async-validation"),b(function(a){this.done(a)}.bind(this)),null)},d.prototype.done=function(a){this.result=a,this.hasRun=!0,this.isRunning=!1,this.$input.removeAttr("disabled").removeClass("async-validation"),this.$form.removeClass("async-validation"),this.haltedFormValidation&&(g.unHaltValidation(this.$form)...

  ): RouteSelector =
    RouteSelector(
      address = address,
      routeDatabase = routeDatabase,
      fastFallback = fastFallback,
      connectionUser = CallConnectionUser(call, ConnectionListener.NONE, newChain(call)),
    )

  private fun newChain(call: RealCall): RealInterceptorChain =
    RealInterceptorChain(
      call = call,
      interceptors = listOf(),
      index = 0,
      exchange = null,

  /**
   * Determines if the given iterable contains no elements.
   *
   * <p>There is no precise {@link Iterator} equivalent to this method, since one can only ask an
   * iterator whether it has any elements <i>remaining</i> (which one does using {@link
   * Iterator#hasNext}).
   *
   * <p><b>{@code Stream} equivalent:</b> {@code !stream.findAny().isPresent()}
   *

repeated in a wondering tone.

  `Why, what are YOUR shoes done with?' said the Gryphon.  `I
mean, what makes them so shiny?'

  Alice looked down at them, and considered a little before she
gave her answer.  `They're done with blacking, I believe.'

  `Boots and shoes under the sea,' the Gryphon went on in a deep
voice, `are done with a whiting.  Now you know.'