---
id: devcycle-python-server-sdk
version: "3.13.12"
license: unclear
license_treatment: unclear
maintenance: active
---

# devcycle-python-server-sdk — DevCycle Python SDK

License: unclear · Maintenance: active · Downloads: 206.5K/mo

## What it is and what it does

DevCycle Python Server SDK is a feature management library that lets your application evaluate feature flags and variables without making synchronous calls to a remote service. It uses local bucketing—downloading configuration and performing flag evaluation on-device—via the DevCycle Bucketing API. The SDK wraps HTTP clients (urllib3, requests) and protocol buffers to deserialize feature configurations, then evaluates them against user context to return flag values or defaults.

The SDK is designed as a singleton in your application, initialized once during startup with your server SDK key. It also exposes an OpenFeature Provider interface (currently in alpha), allowing you to use it as a pluggable backend for the OpenFeature specification if your application already uses that abstraction. The package depends on openfeature-sdk, launchdarkly-eventsource, and protobuf for its core operations.

Use it for:

- Evaluate feature flags server-side without network latency by using local bucketing and cached configurations.
- Run A/B tests and canary deployments by assigning users to variants based on their attributes.
- Integrate feature management into an OpenFeature-compliant application as an alpha-stage provider.
- Gate new features or experimental endpoints behind flags that can be toggled without redeployment.
- Segment users by country, email, or custom attributes to control feature rollout.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

A Python server SDK for DevCycle feature management that evaluates feature flags and variables through local bucketing, integrating with the DevCycle API and supporting OpenFeature.

Yes, with conditions. The package is actively maintained, has low install friction, and solves a real problem for server-side feature management. However, verify the license terms before use (currently unclear in the metadata), and be aware that OpenFeature support is explicitly alpha and may have rough edges. No known vulnerabilities as of the query date.

## Install

pip install devcycle-python-server-sdk
uv add devcycle-python-server-sdk
poetry add devcycle-python-server-sdk

## Installing devcycle-python-server-sdk

Before you install: Low install friction with a pure-Python wheel distribution. Active maintenance with a release 8 days ago; the repository is not archived and receives regular commits. Six runtime dependencies are standard HTTP and serialization libraries.

License in practice: License treatment is unclear—no SPDX identifier or raw license text is recorded. Verify the actual license before use in proprietary or copyleft-sensitive projects.

Quickstart:

pip install devcycle-python-server-sdk

from devcycle_python_sdk import DevCycleLocalClient, DevCycleLocalOptions

options = DevCycleLocalOptions()
client = DevCycleLocalClient('DEVCYCLE_SERVER_SDK_KEY', options)
value = client.variable_value(user, 'variable-key', 'default-value')

Requires Python 3.10 or later. DevCycle server SDK key must be provided at initialization.

Verify before relying:

- Whether the unclear license is documented elsewhere (e.g., in the GitHub repository) and what its terms are.
- Performance characteristics and latency impact of local bucketing in production workloads.
- Stability guarantees for the alpha-stage OpenFeature Provider implementation.

## Package facts

- License: not declared (unclear)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 206.5K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

feature flag management python, feature toggle sdk, devcycle integration, local bucketing api, openfeature provider python, server-side feature flags, a/b testing sdk, feature-flags, a-b-testing, openfeature

[View on SkillFed](https://skillfed.io/packages/devcycle-python-server-sdk) · [View on PyPI](https://pypi.org/project/devcycle-python-server-sdk/)