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# Delete update using Device Update for IoT Hub client SDK
In this sample we will delete an update from Device Update for IoT Hub using Python SDK client library.
## Prerequisites
* Python 3.6 or later is required to use this package
* You need an [Azure subscription][https://azure.microsoft.com/free/], and a [Device Update for IoT Hub][https://learn.microsoft.com/azure/iot-hub-device-update/understand-device-update]
account and instance to use this package.
Set the following environment variables:
- `AZURE_CLIENT_ID`: AAD service principal client id
- `AZURE_TENANT_ID`: AAD tenant id
- `AZURE_CLIENT_SECRET` or `AZURE_CLIENT_CERTIFICATE_PATH`: AAD service principal client secret
- `DEVICEUPDATE_ENDPOINT`: Device Update for IoT Hub hostname
- `DEVICEUPDATE_INSTANCE_ID`: Device Update for IoT Hub instance name
- `DEVICEUPDATE_UPDATE_PROVIDER`: Update provider to delete
- `DEVICEUPDATE_UPDATE_NAME`: Update name to delete
- `DEVICEUPDATE_UPDATE_VERSION`: Update version to delete
## Sample
The sample will delete an existing device update from Device Update for IoT Hub.
### Get update client
First we need to instantiate service client (using environment variables):
``` python
endpoint = os.environ["DEVICEUPDATE_ENDPOINT"]
instance = os.environ["DEVICEUPDATE_INSTANCE_ID"]
client = DeviceUpdateClient(credential=DefaultAzureCredential(), endpoint=endpoint, instance_id=instance)
```
### Delete update
To delete existing update:
``` python
update_provider = os.environ["DEVICEUPDATE_UPDATE_PROVIDER"]
update_name = os.environ["DEVICEUPDATE_UPDATE_NAME"]
update_version = os.environ["DEVICEUPDATE_UPDATE_VERSION"]
response = client.device_update.begin_delete_update(update_provider, update_name, update_version)
response.wait
```
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