Durable Actors for Python
Durable actors and typed clients, backed by the Rust runtime.
Quickstart · Reference · Runnable example
Quickstart
Requires Node.js 22.19+, pnpm, Python 3.11+, and uv.
pnpm dlx durable-actors init my-actors --template python
cd my-actors
pnpm install
uv sync
Define src/actors.py. Every instance field must use persisted() or ephemeral(). Persisted fields are stored in SQLite. Litestream is installed and managed automatically with the runtime; local development persists to the filesystem. Wrap persisted fields with emitted() to broadcast saved changes.
from durable_actors import Actor, emitted, persisted
class Counter(Actor):
count: int = emitted(persisted(0))
def increment(self, amount: int = 1) -> int:
self.count += amount
return self.count
pnpm exec durable-actors dev
Call an actor
In another terminal in the same directory, generate the client:
pnpm exec durable-actors generate
Save as client.py and run uv run client.py:
from generated import actors
counter = actors.Counter.get("one")
print(counter.increment())
Use the client in another application
Copy the entire generated package, including its helper modules, into the application. From that application's root, install the client runtime:
uv add durable-actors
This installs the runtime dependencies automatically. The [codegen] extras are only needed to generate or regenerate clients, not to run them.
Subscribe to state
Callbacks receive complete typed snapshots on a background thread. Keep the process running while listening; the context manager closes the subscription.
from generated import actors
counter = actors.Counter.get("one")
with counter.subscribe(lambda state: print(state.count), on_error=print):
counter.increment()
input("Press Enter to stop.\n")
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Metadata
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Release files for durable-actors 0.7.13
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