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# Azure Service Bus client library for Python - version 7.9.0a1
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# Azure Service Bus client library for Python - version 7.9.0b1
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Azure Service Bus is a high performance cloud-managed messaging service for providing real-time and fault-tolerant communication between distributed senders and receivers.
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* Send and receive messages within your Service Bus channels.
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* Utilize message locks, sessions, and dead letter functionality to implement complex messaging patterns.
**NOTE**: If you are using version 0.50 or lower and want to migrate to the latest version
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of this package please look at our [migration guide to move from Service Bus V0.50 to Service Bus V7][migration_guide].
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Install the Azure Service Bus client library for Python with [pip][pip]:
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```Bash
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pip install azure-servicebus
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pip install azure-servicebus==7.9.0b1
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```
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### Prerequisites:
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*[ServiceBusClient][client_reference]: This is the object a user should first initialize to connect to a Service Bus Namespace. To interact with a queue, topic, or subscription, one would spawn a sender or receiver off of this client.
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*[ServiceBusSender][sender_reference]: To send messages to a Queue or Topic, one would use the corresponding `get_queue_sender` or `get_topic_sender` method off of a `ServiceBusClient` instance as seen [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0a1/sdk/servicebus/azure-servicebus/samples/sync_samples/send_queue.py).
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*[ServiceBusSender][sender_reference]: To send messages to a Queue or Topic, one would use the corresponding `get_queue_sender` or `get_topic_sender` method off of a `ServiceBusClient` instance as seen [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0b1/sdk/servicebus/azure-servicebus/samples/sync_samples/send_queue.py).
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*[ServiceBusReceiver][receiver_reference]: To receive messages from a Queue or Subscription, one would use the corresponding `get_queue_receiver` or `get_subscription_receiver` method off of a `ServiceBusClient` instance as seen [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0a1/sdk/servicebus/azure-servicebus/samples/sync_samples/receive_queue.py).
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*[ServiceBusReceiver][receiver_reference]: To receive messages from a Queue or Subscription, one would use the corresponding `get_queue_receiver` or `get_subscription_receiver` method off of a `ServiceBusClient` instance as seen [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0b1/sdk/servicebus/azure-servicebus/samples/sync_samples/receive_queue.py).
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*[ServiceBusMessage][message_reference]: When sending, this is the type you will construct to contain your payload. When receiving, this is where you will access the payload.
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@@ -115,14 +115,14 @@ The following sections provide several code snippets covering some of the most c
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To perform management tasks such as creating and deleting queues/topics/subscriptions, please utilize the azure-mgmt-servicebus library, available [here][servicebus_management_repository].
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Please find further examples in the [samples](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0a1/sdk/servicebus/azure-servicebus/samples) directory demonstrating common Service Bus scenarios such as sending, receiving, session management and message handling.
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Please find further examples in the [samples](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0b1/sdk/servicebus/azure-servicebus/samples) directory demonstrating common Service Bus scenarios such as sending, receiving, session management and message handling.
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### Send messages to a queue
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> **NOTE:** see reference documentation [here][send_reference].
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This example sends single message and array of messages to a queue that is assumed to already exist, created via the Azure portal or az commands.
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```Python
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```python
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from azure.servicebus import ServiceBusClient, ServiceBusMessage
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import os
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> **NOTE:** A message may be scheduled for delayed delivery using the `ServiceBusSender.schedule_messages()` method, or by specifying `ServiceBusMessage.scheduled_enqueue_time_utc` before calling `ServiceBusSender.send_messages()`
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> For more detail on scheduling and schedule cancellation please see a sample [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0a1/sdk/servicebus/azure-servicebus/samples/sync_samples/schedule_messages_and_cancellation.py).
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> For more detail on scheduling and schedule cancellation please see a sample [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0b1/sdk/servicebus/azure-servicebus/samples/sync_samples/schedule_messages_and_cancellation.py).
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### Receive messages from a queue
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To receive from a queue, you can either perform an ad-hoc receive via `receiver.receive_messages()` or receive persistently through the receiver itself.
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#### [Receive messages from a queue through iterating over ServiceBusReceiver][streaming_receive_reference]
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```Python
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```python
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from azure.servicebus import ServiceBusClient
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import os
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> **NOTE:**`ServiceBusReceiver.receive_messages()` receives a single or constrained list of messages through an ad-hoc method call, as opposed to receiving perpetually from the generator. It always returns a list.
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```Python
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```python
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from azure.servicebus import ServiceBusClient
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import os
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Sessions provide first-in-first-out and single-receiver semantics on top of a queue or subscription. While the actual receive syntax is the same, initialization differs slightly.
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```Python
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```python
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from azure.servicebus import ServiceBusClient, ServiceBusMessage
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import os
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Topics and subscriptions give an alternative to queues for sending and receiving messages. See documents [here][topic_concept] for more overarching detail,
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and of how these differ from queues.
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```Python
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```python
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from azure.servicebus import ServiceBusClient, ServiceBusMessage
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import os
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Declares the message processing to be successfully completed, removing the message from the queue.
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```Python
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```python
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from azure.servicebus import ServiceBusClient
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import os
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Abandon processing of the message for the time being, returning the message immediately back to the queue to be picked up by another (or the same) receiver.
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```Python
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```python
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from azure.servicebus import ServiceBusClient
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import os
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#### [DeadLetter][deadletter_reference]
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Transfer the message from the primary queue into a special "dead-letter sub-queue" where it can be accessed using the `ServiceBusClient.get_<queue|subscription>_receiver` function with parameter `sub_queue=ServiceBusSubQueue.DEAD_LETTER` and consumed from like any other receiver. (see sample [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0a1/sdk/servicebus/azure-servicebus/samples/sync_samples/receive_deadlettered_messages.py))
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Transfer the message from the primary queue into a special "dead-letter sub-queue" where it can be accessed using the `ServiceBusClient.get_<queue|subscription>_receiver` function with parameter `sub_queue=ServiceBusSubQueue.DEAD_LETTER` and consumed from like any other receiver. (see sample [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0b1/sdk/servicebus/azure-servicebus/samples/sync_samples/receive_deadlettered_messages.py))
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```Python
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```python
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from azure.servicebus import ServiceBusClient
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import os
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#### [Defer][defer_reference]
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Defer is subtly different from the prior settlement methods. It prevents the message from being directly received from the queue
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by setting it aside such that it must be received by sequence number in a call to `ServiceBusReceiver.receive_deferred_messages` (see sample [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0a1/sdk/servicebus/azure-servicebus/samples/sync_samples/receive_deferred_message_queue.py))
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by setting it aside such that it must be received by sequence number in a call to `ServiceBusReceiver.receive_deferred_messages` (see sample [here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0b1/sdk/servicebus/azure-servicebus/samples/sync_samples/receive_deferred_message_queue.py))
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```Python
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```python
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from azure.servicebus import ServiceBusClient
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import os
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### More sample code
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Please find further examples in the [samples](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0a1/sdk/servicebus/azure-servicebus/samples) directory demonstrating common Service Bus scenarios such as sending, receiving, session management and message handling.
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Please find further examples in the [samples](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0b1/sdk/servicebus/azure-servicebus/samples) directory demonstrating common Service Bus scenarios such as sending, receiving, session management and message handling.
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### Additional documentation
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For users seeking to perform management operations against ServiceBus (Creating a queue/topic/etc, altering filter rules, enumerating entities)
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please see the [azure-mgmt-servicebus documentation][service_bus_mgmt_docs] for API documentation. Terse usage examples can be found
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[here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0a1/sdk/servicebus/azure-mgmt-servicebus/tests) as well.
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[here](https://github.com/Azure/azure-sdk-for-python/tree/azure-servicebus_7.9.0b1/sdk/servicebus/azure-mgmt-servicebus/tests) as well.
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