例如，你可以建立一個名為 `main.py` 的檔案，其中包含以下內容：

```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip

第二個參數是 <a href="https://docs.python.org/zh-tw/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> 的預設回傳值。

如果沒有提供，預設值為 `None`，這裡我們提供 `"World"` 作為預設值。

///

然後你可以呼叫這個 Python 程式：

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package asm

import (
	"bufio"
	"bytes"
	"fmt"
	"internal/buildcfg"
	"os"
	"path/filepath"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"testing"

	"cmd/asm/internal/lex"
	"cmd/internal/obj"
)

// An end-to-end test for the assembler: Do we print what we parse?

    }

    public void test_getUserAgentType_safariWithoutChrome() {
        getMockRequest().addHeader("user-agent",
                "Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.1 Mobile/15E148 Safari/604.1");
        assertEquals(UserAgentType.SAFARI, userAgentHelper.getUserAgentType());
    }

Após a criação dos testes, você pode atualizar a sua versão do **FastAPI** para uma mais recente, execute os testes para se certificar de que todo o seu código está funcionando corretamente.

Se tudo estiver funcionando, ou após você realizar as alterações necessárias e todos os testes estiverem passando, então você pode fixar sua versão de `FastAPI` para essa mais nova.

## Sobre Starlette

        model: CIBuildModel,
        stage: Stage,
        testCoverage: TestCoverage,
        bucketIndex: Int,
    ): FunctionalTest {
        val parallelizationMethod =
            when (testCoverage.os) {
                Os.LINUX -> ParallelizationMethod.TestDistribution
                else -> ParallelizationMethod.None
            }

        return FunctionalTest(
            model,

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Environment (please complete the following information):**
 - OS: [e.g. Windows 10]
 - Browser [e.g. chrome, safari]
 - Version [e.g. 13.5.0]

**Additional context**

func (in *Input) Error(args ...interface{}) {
	if panicOnError {
		panic(fmt.Errorf("%s:%d: %s", in.File(), in.Line(), fmt.Sprintln(args...)))
	}
	fmt.Fprintf(os.Stderr, "%s:%d: %s", in.File(), in.Line(), fmt.Sprintln(args...))
	os.Exit(1)
}

// expectText is like Error but adds "got XXX" where XXX is a quoted representation of the most recent token.
func (in *Input) expectText(args ...interface{}) {

pkg net/url, method (*URL) EscapedFragment() string
pkg net/url, method (*URL) Redacted() string
pkg net/url, type URL struct, RawFragment string
pkg os, method (*File) ReadFrom(io.Reader) (int64, error)
pkg os, var ErrDeadlineExceeded error
pkg regexp, method (*Regexp) SubexpIndex(string) int
pkg strconv, func FormatComplex(complex128, uint8, int, int) string

উদাহরণস্বরূপ, আপনার `main.py` নামে একটি ফাইল থাকতে পারেঃ

```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
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> এর দ্বিতীয় আর্গুমেন্টটি হলো এর ডিফল্ট ভ্যালু যা রিটার্ন করা হবে।

Por ejemplo, podrías tener un archivo `main.py` con:

```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip | Consejo

El segundo argumento de <a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> es el valor por defecto a retornar.