*   `tf.compat.v1.Session`

But we want to be able to parameterize that fixed content.

## A "callable" instance { #a-callable-instance }

In Python there's a way to make an instance of a class a "callable".

Not the class itself (which is already a callable), but an instance of that class.

To do that, we declare a method `__call__`:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[12] *}

# https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html

# In case of running on EC2
# - we add a TeamCity tag to the build with an instance type of the EC2 instance.
# - we set GRADLE_RO_DEP_CACHE to '/opt/gradle-cache' if the folder exists.

curl -m 1 -s "http://169.254.169.254/latest/meta-data/instance-id"
IS_EC2_INSTANCE=$?
if [ $IS_EC2_INSTANCE -ne 0 ]; then

    }

    public void test_constructor() {
        assertNotNull("Constructor should create instance", target);
        assertTrue("Instance should be of correct type", target instanceof HotThreadMonitorTarget);
        assertTrue("Instance should be a MonitorTarget", target instanceof MonitorTarget);
        assertTrue("Instance should be a TimeoutTarget", target instanceof TimeoutTarget);
    }

        ResultOffsetExceededException exception1 = new ResultOffsetExceededException("First instance");
        ResultOffsetExceededException exception2 = new ResultOffsetExceededException("Second instance");
        ResultOffsetExceededException exception3 = new ResultOffsetExceededException("Third instance");

        assertNotSame(exception1, exception2);
        assertNotSame(exception2, exception3);

    }

    public void test_constructor() {
        assertNotNull("Constructor should create instance", target);
        assertTrue("Instance should be of correct type", target instanceof SystemMonitorTarget);
        assertTrue("Instance should be a MonitorTarget", target instanceof MonitorTarget);
        assertTrue("Instance should be a TimeoutTarget", target instanceof TimeoutTarget);
    }

            CrawlerEngineClient client = new CrawlerEngineClient();
            assertNotNull(client);
        }
    }

    // Test instance fields initialization
    public void test_instanceFieldsInitialization() {
        // Test that instance fields are properly initialized
        assertNotNull(crawlerEngineClient);
        // The actual client initialization happens lazily when needed
    }

            // Create new Mac instance for thread safety without blocking other operations
            Mac mac;
            try {
                mac = createMacInstance();
            } catch (GeneralSecurityException e) {
                log.error("Failed to create Mac instance for signing", e);
                throw new RuntimeException("Failed to create Mac instance", e);
            }

## Classes as dependencies { #classes-as-dependencies_1 }

You might notice that to create an instance of a Python class, you use that same syntax.

For example:

```Python
class Cat:
    def __init__(self, name: str):
        self.name = name


fluffy = Cat(name="Mr Fluffy")
```

In this case, `fluffy` is an instance of the class `Cat`.

And to create `fluffy`, you are "calling" `Cat`.

<components namespace="fessCrawler">
    <component name="crawler" class="org.codelibs.fess.crawler.Crawler" instance="prototype"/>
    <component name="httpClient" class="org.codelibs.fess.crawler.client.http.HcHttpClient" instance="singleton"/>
    <component name="fileTransformer" class="org.codelibs.fess.crawler.transformer.impl.FileTransformer" instance="singleton"/>
</components>
```

### Crawler Context Configuration

```java