A/B Smartly SDK

A/B Smartly - Python SDK

Compatibility

The A/B Smartly Python SDK is compatible with Python 3. It provides both a blocking and an asynchronous interfaces.

Installation

pip install absmartly==0.1.2

Python Modules

setuptools~=60.2.0
requests~=2.28.1
urllib3~=1.26.12
jsons~=1.6.3

Dependencies

sh ./run.sh

Getting Started

Please follow the installation instructions before trying the following code:

Initialization

This example assumes an Api Key, an Application, and an Environment have been created in the A/B Smartly web console.

def main():
    client_config = ClientConfig()
    client_config.endpoint = "https://sandbox.test.io/v1"
    client_config.api_key = "test"
    client_config.application = "www"
    client_config.environment = "prod"

    default_client_config = DefaultHTTPClientConfig()
    default_client = DefaultHTTPClient(default_client_config)
    sdk_config = ABSmartlyConfig()
    sdk_config.client = Client(client_config, default_client)
    sdk = ABSmartly(sdk_config)

    context_config = ContextConfig()
    ctx = sdk.create_context(context_config)

   # ...
}

Creating a new Context synchronously

# define a new context request
    context_config = ContextConfig()
    context_config.publish_delay = 10
    context_config.refresh_interval = 5
    context_config.units = {"session_id": "bf06d8cb5d8137290c4abb64155584fbdb64d8",
                            "user_id": "12345"}

    context_config = ContextConfig()
    ctx = sdk.create_context(context_config)
    ctx.wait_until_ready()

Creating a new Context asynchronously

# define a new context request
    context_config = ContextConfig()
    context_config.publish_delay = 10
    context_config.refresh_interval = 5
    context_config.units = {"session_id": "bf06d8cb5d8137290c4abb64155584fbdb64d8",
                            "user_id": "12345"}

    context_config = ContextConfig()
    ctx = sdk.create_context(context_config)
    ctx.wait_until_ready_async()

Setting extra units for a context

You can add additional units to a context by calling the set_unit() or the set_units() method. This method may be used for example, when a user logs in to your application, and you want to use the new unit type to the context. Please note that you cannot override an already set unit type as that would be a change of identity, and will throw an exception. In this case, you must create a new context instead. The SetUnit() and SetUnits() methods can be called before the context is ready.

context.set_unit("db_user_id", "1000013")

context.set_units({
		"db_user_id": "1000013"
})

Setting context attributes

The set_attributes() and set_attributes() methods can be called before the context is ready.

context.set_attributes("user_agent", req.get_header("User-Agent"))

context.set_attributes({
        "customer_age": "new_customer"
})

Selecting a treatment

res, _ = context.get_treatment("exp_test_experiment")
if res == 0:
        # user is in control group (variant 0)
else:
       # user is in treatment group

Tracking a goal achievement

Goals are created in the A/B Smartly web console.

context.track("payment", {
        "item_count": 1,
        "total_amount": 1999.99
})

Publishing pending data

Sometimes it is necessary to ensure all events have been published to the A/B Smartly collector, before proceeding. You can explicitly call the publish() or publish_async() methods.

    context.publish()

Finalizing

The close() and close_async() methods will ensure all events have been published to the A/B Smartly collector, like publish(), and will also "seal" the context, throwing an error if any method that could generate an event is called.

context.close()

Refreshing the context with fresh experiment data

For long-running contexts, the context is usually created once when the application is first started. However, any experiments being tracked in your production code, but started after the context was created, will not be triggered. To mitigate this, we can use the set_refresh_interval() method on the context config.

    default_client_config = DefaultHTTPClientConfig()
    default_client_config.refresh_interval = 5

Alternatively, the refresh() method can be called manually. The refresh() method pulls updated experiment data from the A/B Smartly collector and will trigger recently started experiments when get_treatment() is called again.

context.refresh()

Using a custom Event Logger

The A/B Smartly SDK can be instantiated with an event logger used for all contexts. In addition, an event logger can be specified when creating a particular context, in the ContextConfig.

class EventType(Enum):
    ERROR = "error"
    READY = "ready"
    REFRESH = "refresh"
    PUBLISH = "publish"
    EXPOSURE = "exposure"
    GOAL = "goal"
    CLOSE = "close"


class ContextEventLogger:

    @abstractmethod
    def handle_event(self, event_type: EventType, data: object):
        raise NotImplementedError

The data parameter depends on the type of event. Currently, the SDK logs the following events:

Peek at treatment variants

Although generally not recommended, it is sometimes necessary to peek at a treatment or variable without triggering an exposure. The A/B Smartly SDK provides a peek_treament() method for that.

 res = context.peek_treamnet("exp_test_experiment")
if res == 0:
	# user is in control group (variant 0)
else:
	# user is in treatment group

Peeking at variables

variable = context.peek_variable("my_variable")

Overriding treatment variants

During development, for example, it is useful to force a treatment for an experiment. This can be achieved with the override() and/or overrides() methods. The set_override() and set_overrides() methods can be called before the context is ready.

context.set_override("exp_test_experiment", 1) # force variant 1 of treatment
context.set_overrides({
	"exp_test_experiment": 1,
	"exp_another_experiment": 0
})

About A/B Smartly

A/B Smartly is the leading provider of state-of-the-art, on-premises, full-stack experimentation platforms for engineering and product teams that want to confidently deploy features as fast as they can develop them. A/B Smartly's real-time analytics helps engineering and product teams ensure that new features will improve the customer experience without breaking or degrading performance and/or business metrics.

Have a look at our growing list of clients and SDKs:

• Java SDK
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• Swift SDK
• Vue2 SDK
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• Ruby SDK