Installation

The Featsync Python SDK is available on PyPI and works with Python 3.8+.

Package Managers

pip

bash pip install featsync

poetry

bash poetry add featsync

pipenv

bash pipenv install featsync

Requirements

• Python 3.8 or later
• Works in sync and async contexts
• Type hints included (PEP 561 compliant)

Importing

from featsync import Featsync, EvaluationContext

Dependencies

The SDK has minimal dependencies:

• httpx - Modern HTTP client for Python

Type Hints

Full type hint support is included:

from featsync import (
    Featsync,
    EvaluationContext,
    EvaluationResult,
    Flag,
    FlagsMap,
    FeatsyncConfig,
)

client = Featsync(api_key="fs_your_api_key")

flag: Flag = client.get_flag("my-flag")
flags: FlagsMap = client.get_all_flags()

Next Steps

• Configure the SDK with your API key
• Learn basic usage patterns
• Set up targeting rules for user-specific flags