launchdarkly-server-sdk

import os from launchdarkly_server_sdk import LdClient, Config # Replace with your actual SDK key from LaunchDarkly SDK_KEY = os.environ.get('LAUNCHDARKLY_SDK_KEY', 'YOUR_SDK_KEY_HERE') if not SDK_KEY or SDK_KEY == 'YOUR_SDK_KEY_HERE': print("Warning: LAUNCHDARKLY_SDK_KEY environment variable not set or default used. Client will be in offline mode.") # In a real application, you might raise an error or handle this differently. config = Config(offline=True) else: config = Config() # Initialize the LaunchDarkly client ld_client = LdClient(SDK_KEY, config) # Wait for the client to be initialized (recommended for server-side apps) if ld_client.is_initialized(): print("LaunchDarkly client initialized!") # Define a user for flag evaluation user = { "key": "example-user-key", "name": "Example User", "custom": { "group": "beta_testers" } } # Evaluate a feature flag flag_value = ld_client.variation("my-feature-flag", user, False) print(f"Feature flag 'my-feature-flag' is: {flag_value} for user {user['key']}") # Don't forget to shut down the client when your application exits ld_client.close() print("LaunchDarkly client closed.") else: print("LaunchDarkly client failed to initialize.") # Ensure the client is closed even if initialization fails ld_client.close()