This release is a pre-release and may not be stable for production use.
Dagger Python SDK
A client package for running Dagger pipelines.
What is the Dagger Python SDK?
The Dagger Python SDK contains everything you need to develop CI/CD pipelines in Python, and run them on any OCI-compatible container runtime.
Requirements
- Python 3.10 or later
- Docker, or another OCI-compatible container runtime
A compatible version of the Dagger CLI is automatically downloaded and run by the SDK for you, although it’s possible to manage it manually.
Installation
From PyPI, using pip:
pip install dagger-io
You can also install via Conda, from the conda-forge channel:
conda install dagger-io
Example
Create a main.py file:
import sys
import anyio
import dagger
from dagger import dag
async def main(args: list[str]):
async with dagger.connection():
# build container with cowsay entrypoint
ctr = (
dag.container()
.from_("python:alpine")
.with_exec(["pip", "install", "cowsay"])
)
# run cowsay with requested message
result = await ctr.with_exec(["cowsay", *args]).stdout()
print(result)
anyio.run(main, sys.argv[1:])
Run with:
$ python main.py "Simple is better than complex"
_____________________________
| Simple is better than complex |
=============================
\
\
^__^
(oo)\_______
(__)\ )\/\
||----w |
|| ||
Note It may take a while for it to finish, especially on first run with cold cache.
If you need to debug, you can stream the logs from the engine with the log_output config:
config = dagger.Config(log_output=sys.stderr)
async with dagger.connection(config):
...
Learn more
Development
The SDK is managed with a Dagger module in ./dev. To see which tasks are
available run:
dagger call -m dev
Common tasks
Run pytest in supported Python versions:
dagger call -m dev test default
Check for linting violations:
dagger call -m dev lint
Re-format code following common styling conventions:
dagger call -m dev format export --path=.
Update pinned development dependencies (run from this directory, ./sdk/python, or adjust export path accordingly):
dagger call -m ../../.dagger/modules/python-client-dev dev-container with-exec --args uv,lock,-U directory --path . export --path .
Update a single pinned development dependency (run from this directory, ./sdk/python, or adjust export path accordingly):
dagger call -m ../../.dagger/modules/python-client-dev dev-container with-exec --args uv,lock,-P,<DEPNAME> directory --path . export --path .
Build and preview the reference documentation:
dagger call -m dev docs preview up
Add --help to any command to check all the available options.
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