# Python

{% hint style="info" %}
The Hackle Python SDK supports Python 3 and above.

If you are using a WSGI environment, be sure to check the [WSGI Configuration](/en/development-guide/python/python-sdk-wsgi-init.md) guide.
{% endhint %}

## Add Dependency

[![](https://img.shields.io/pypi/v/hackle-sdk)](https://pypi.org/project/hackle-sdk)

```shell
pip install hackle-sdk
```

## SDK Initialization

{% hint style="danger" %}
`hackle_client` is a global variable and must be created only once.

`hackle_client` manages state internally to evaluate results immediately from threads without I/O.\
This uses additional resources for that purpose.

Do not create a new instance for every request; instead, use the already-created instance.

Since `hackle_client` is built as a singleton object, using `hackle.Client()` in other functions will not recreate it.
{% endhint %}

`hackle_client` is the class that provides methods for using SDK features.

To use the SDK, you need to initialize `hackle_client`.

#### Instantiation

Instantiate `hackle_client` by passing the SDK Key.\
`hackle_client` periodically synchronizes with the Hackle server as a background task to obtain the necessary information.

* You can find the SDK Key in [SDK Integration Info](https://dashboard.hackle.io/config/sdk-setting) located inside the Hackle Service Dashboard.

```python
from hackle import hackle

# YOUR_SERVER_SDK_KEY 자리에 SDK 키를 넣습니다.
hackle_client = hackle.Client(sdk_key=YOUR_SERVER_SDK_KEY)
```

## Shutdown

When the application shuts down, you must shut down `hackle_client` using the `hackle_client.close()` method.\
This releases resources in use and sends any remaining events.

{% hint style="danger" %}
If the application shuts down without calling `hackle_client.close()`, events may be lost.
{% endhint %}

```python
hackle_client.close()
```

#### Using Flask or Django?

You can use `@atexit.register` to automatically shut down `hackle_client` when the application exits.

```python
import atexit

@atexit.register
def __exit__():
    hackle_client.close()
```


---

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