unleash-client-python

This is the Python client for Unleash. It implements Client Specifications 1.0 and checks compliance based on spec in unleash/client-specifications

What it supports:

• Default activation strategies using 32-bit Murmerhash3
• Custom strategies
• Full client lifecycle:
  • Client registers with Unleash server
  • Client periodically fetches feature toggles and stores to on-disk cache
  • Client periodically sends metrics to Unleash Server
• Tested on Linux (Ubuntu), OSX, and Windows

Check out the project documentation and the changelog.

Installation

Check out the package on Pypi!

pip install UnleashClient

Usage

Initialization

from UnleashClient import UnleashClient
client = UnleashClient("https://unleash.herokuapp.com/api", "My Program")
client.initialize_client()

To clean up gracefully:

client.destroy()

Arguments

Checking if a feature is enabled

A check of a simple toggle:

client.is_enabled("My Toggle")

Specifying a default value:

client.is_enabled("My Toggle", default_value=True)

Supplying application context:

app_context = {"userId": "[email protected]"}
client.is_enabled("User ID Toggle", app_context)

Supplying a fallback function:

def custom_fallback(feature_name: str, context: dict) -> bool:
    return True

client.is_enabled("My Toggle", fallback_function=custom_fallback)

• Must accept the fature name and context as an argument.
• Client will evaluate the fallback function only if exception occurs when calling the is_enabled() method i.e. feature flag not found or other general exception.
• If both a default_value and fallback_function are supplied, client will define the default value by ORing the default value and the output of the fallback function.

Getting a variant

Checking for a variant:

context = {'userId': '2'}  # Context must have userId, sessionId, or remoteAddr.  If none are present, distribution will be random.

variant = client.get_variant("MyvariantToggle", context)

print(variant)
> {
>    "name": "variant1",
>    "payload": {
>        "type": "string",
>        "value": "val1"
>        },
>    "enabled": True
> }

For more information about variants, see the Variant documentation.