envflags Python SDK

The Python SDK downloads an immutable delivery payload, keeps the last known good copy in memory, and evaluates flags locally using the shared v1 spec.

from envflags import create_client

flags = create_client("envflags_server_...").initialize()
try:
    enabled = flags.bool_variation(
        "new-checkout",
        False,
        {"key": "user-123", "country": "BE"},
    )
finally:
    flags.close()

Context is optional. Omit it for flags that do not depend on who is asking; pass it last when targeting needs a user.

The client polls every 30 seconds and fetches a payload only when its version changes. Set poll_interval=None to refresh manually. Supply a previously persisted payload through bootstrap to remain available when initialization is offline. Refresh failures never replace the last known good payload.

The package supports Python 3.9+ and has no third-party dependencies. evaluate and bucket are exported for applications that manage payload delivery themselves.

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