Initialize the Statsig Python server-core SDK with a secret key and check a feature gate for a user

Documented steps

1. Install the current Server Core Python SDK (not the older `statsig` PyPI package): pip install statsig-python-core
2. Import the classes: from statsig_python_core import Statsig, StatsigOptions, StatsigUser
3. Get a Server Secret Key (starts with `secret-`) from the Statsig console API Keys tab; this key must stay server-side only.
4. Optionally configure options: options = StatsigOptions(); options.environment = "development"
5. Create the client and initialize it once at process/app startup: statsig = Statsig("secret-key", options); statsig.initialize().wait()
6. In WSGI servers with multiple worker processes, initialize inside each worker rather than once before the workers fork.
7. Build a StatsigUser for each request: user = StatsigUser(user_id="a-user", email="user@example.com", custom={"plan": "premium"})
8. Check the gate: if statsig.check_gate(user, "a_gate"): # gate is on, else treat as off.
9. Gates default to OFF and only return true once targeting/rules are configured for that gate in the console.
10. On shutdown, flush pending exposure/log events before the process exits: statsig.shutdown().wait()
11. Reference: https://docs.statsig.com/server-core/python-core