例如，您可以有一个名为 `main.py` 的文件，其中包含以下内容：

```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> 的第二个参数是要返回的默认值。

如果没有提供默认值，默认为 `None`，此处我们提供了 `"World"` 作为要使用的默认值。

///

然后，您可以调用该 Python 程序：

	//
	// Until the container image changes, this behavior has to be preserved.
	if isPresent(EnvKMSSecretKey) && os.Getenv(EnvKMSSecretKey) == "" {
		os.Unsetenv(EnvKMSSecretKey)
	}
	if isPresent(EnvKMSSecretKeyFile) {
		if filename := os.Getenv(EnvKMSSecretKeyFile); filename == "" {
			os.Unsetenv(EnvKMSSecretKeyFile)
		} else if _, err := os.Stat(filename); errors.Is(err, os.ErrNotExist) {

		fmt.Fprintf(os.Stderr, "adb %s\n%s", strings.Join(args, " "), out)
		return err
	}
	return nil
}

func adbCmd(args ...string) *exec.Cmd {
	if flags := os.Getenv("GOANDROID_ADB_FLAGS"); flags != "" {
		args = append(strings.Split(flags, " "), args...)
	}
	return exec.Command("adb", args...)
}

const (
	deviceRoot   = "/data/local/tmp/go_android_exec"

// This will override the storage class returned by the storage backend if it is non-standard
// and we detect a Veeam client by checking the User Agent.
var globalVeeamForceSC = os.Getenv("_MINIO_VEEAM_FORCE_SC")

type systemInfo struct {
	XMLName              xml.Name `xml:"SystemInfo" json:"-"`
	ProtocolVersion      string   `xml:"ProtocolVersion"`
	ModelName            string   `xml:"ModelName"`

	if err != nil {
		logger.FatalIf(err, "Unable to validate passed arguments in %s:%s",
			config.EnvArgs, os.Getenv(config.EnvArgs))
	}
	if v == "" {
		v, _, _, err = env.LookupEnv(config.EnvVolumes)
		if err != nil {
			logger.FatalIf(err, "Unable to validate passed arguments in %s:%s",
				config.EnvVolumes, os.Getenv(config.EnvVolumes))
		}
	}
	if v == "" {
		// Fall back to older environment value MINIO_ENDPOINTS

				suite := testCase

				suite.SetUpSuite(c)

				suite.SFTPServiceAccountLogin(c)
				suite.SFTPInvalidServiceAccountPassword(c)

				// LDAP tests
				ldapServer := os.Getenv(EnvTestLDAPServer)
				if ldapServer == "" {
					c.Skipf("Skipping LDAP test as no LDAP server is provided via %s", EnvTestLDAPServer)
				}

				suite.SetUpLDAP(c, ldapServer)

        }
        executionMode = ExecutionMode.valueOf(args[0]);
        if (executionMode == ExecutionMode.KILL_PROCESSES_STARTED_BY_GRADLE && !Boolean.parseBoolean(System.getenv("GRADLE_RUNNER_FINISHED"))) {
            // https://github.com/gradle/gradle-private/issues/3991

	}

	return nil
}

func (target *KafkaTarget) init() error {
	return target.initOnce.Do(target.initKafka)
}

func (target *KafkaTarget) initKafka() error {
	if os.Getenv("_MINIO_KAFKA_DEBUG") != "" {
		sarama.DebugLogger = log.Default()
	}

	args := target.args

	config := sarama.NewConfig()
	if args.Version != "" {

		atomic.StoreInt32(&h.status, statusOffline)
	} else {
		atomic.StoreInt32(&h.status, statusOnline)
	}
	return err
}

// Init initialize kafka target
func (h *Target) init() error {
	if os.Getenv("_MINIO_KAFKA_DEBUG") != "" {
		sarama.DebugLogger = log.Default()
	}

	sconfig := sarama.NewConfig()
	if h.kconfig.Version != "" {
		kafkaVersion, err := sarama.ParseKafkaVersion(h.kconfig.Version)

		os.Setenv("CONSOLE_STS_DURATION", valueSts)
	} else if valueSession := env.Get(config.EnvBrowserSessionDuration, ""); valueSession != "" {
		os.Setenv("CONSOLE_STS_DURATION", valueSession)
	}

	os.Setenv("CONSOLE_MINIO_SITE_NAME", globalSite.Name())
	os.Setenv("CONSOLE_MINIO_SITE_REGION", globalSite.Region())
	os.Setenv("CONSOLE_MINIO_REGION", globalSite.Region())