cwsandbox-client
A Python client library for CWSandboxes.
Documentation
See the documentation site for the full tutorial, guides, and API reference.
Quick Start
from cwsandbox import Sandbox
# Quick one-liner with factory method (sync/async hybrid API)
sb = Sandbox.run("echo", "Hello, World!")
sb.stop().result() # Block for completion
# Context manager for automatic cleanup
with Sandbox.run("sleep", "infinity", container_image="python:3.11") as sb:
result = sb.exec(["python", "-c", "print(2 + 2)"]).result()
print(result.stdout) # 4
# Also works in async contexts
async with Sandbox.run("sleep", "infinity") as sb:
result = await sb.exec(["python", "-c", "print(2 + 2)"])
print(result.stdout) # 4
Command-line interface
Install the optional CLI to inspect and manage existing sandboxes from your terminal:
pip install "cwsandbox[cli]"
export CWSANDBOX_API_KEY="your-api-key"
export SANDBOX_ID="your-sandbox-id"
# Discover and inspect sandboxes
cwsandbox ls
cwsandbox get "$SANDBOX_ID"
# Run a command or open an interactive shell
cwsandbox exec "$SANDBOX_ID" python -c "print('hello')"
cwsandbox sh "$SANDBOX_ID"
# Inspect the main process logs, then stop the sandbox
cwsandbox logs "$SANDBOX_ID" --tail 100 --timestamps
cwsandbox stop "$SANDBOX_ID"
The CLI operates on sandboxes created with the Python SDK or another client. Run
cwsandbox --help or cwsandbox <command> --help for all commands and options.
Sandbox data connections
Exec, log, and file operations prefer a sandbox-scoped direct mTLS connection. Lifecycle and management operations continue to use the CWSandbox API. The SDK generates the private key in memory, sends only a certificate signing request, and never sends API bearer credentials to the sandbox data endpoint.
The default auto policy uses a short direct-connect budget, then falls back to
the API gateway. You can require either path for validation or rollback:
from cwsandbox import DataPlaneMode, Sandbox, SandboxDefaults
# Fail instead of falling back, useful when validating direct connectivity.
with Sandbox.run(data_plane_mode=DataPlaneMode.DIRECT) as sb:
print(sb.exec(["echo", "direct"]).result().stdout)
# Disable direct access for a group of sandboxes.
defaults = SandboxDefaults(data_plane_mode=DataPlaneMode.GATEWAY)
with Sandbox.run(defaults=defaults) as sb:
print(sb.exec(["echo", "gateway"]).result().stdout)
Direct credentials are scoped to the requested operation and created lazily. Active streams retain their connection, while a process-wide bounded idle-channel cache prevents large collections of inactive sandbox objects from retaining one socket per sandbox.
Authentication
Authentication defaults to AuthStrategy.COREWEAVE_API_KEY, which reads
CWSANDBOX_API_KEY and sends it as a Bearer token. The strategy argument is
optional, so existing callers do not need to change.
To use W&B credentials, install the optional integration and select it
explicitly. Credential resolution is delegated to the W&B SDK and supports an
active W&B session, WANDB_API_KEY, and the host-specific entry in .netrc:
pip install "cwsandbox[wandb]"
from cwsandbox import AuthStrategy, Sandbox
with Sandbox.run(auth=AuthStrategy.WANDB) as sb:
...
Sandboxes are created in your default W&B entity unless you choose one. To pick
an entity (for example, a team in a different organization) or a project, pass
WandbAuth:
from cwsandbox import Sandbox, WandbAuth
with Sandbox.run(auth=WandbAuth(entity="my-team")) as sb:
...
The entity is resolved in this order: WandbAuth(entity=...), the active
wandb.run, then W&B settings such as WANDB_ENTITY. AuthStrategy.WANDB
is the same as WandbAuth().
W&B authentication is sent in the x-wandb-api-key header; it is not treated
as a CoreWeave Bearer token.
Embedding in a long-running host
Scripts and CLIs keep the default: the first owned sandbox registers atexit
and, on the main thread, SIGINT/SIGTERM handlers so a signal can stop Sessions
and exit.
Long-running hosts that already own process lifecycle should disable those
signal handlers before creating a sandbox. atexit still runs on normal
process exit. The host is responsible for graceful shutdown and for explicitly
stopping sandboxes it owns.
import cwsandbox
cwsandbox.disable_signal_handlers()
CWSANDBOX_DISABLE_SIGNAL_HANDLERS=1
Accepted environment values: 1, true, yes, on (case-insensitive).
Configure the API or environment variable before the first owned sandbox;
changing the variable afterward has no effect.
Development
See DEVELOPMENT.md for setup and workflow.
For code standards and commit guidelines, see CONTRIBUTING.md.
License
- The CWSandbox Client library is licensed under the Apache-2.0 license.
- The CWSandbox Client examples are licensed under the BSD-3-Clause license.
Release files for cwsandbox 1.18.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| cwsandbox-1.18.0.tar.gz | 662.1 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| cwsandbox-1.18.0-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 921.0 kB
Release files / cwsandbox-1.18.0.tar.gz
| Download URL | cwsandbox-1.18.0.tar.gz |
|---|---|
| Size | 662.1 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
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| Tags | Python 3 |
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Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
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