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A convention over configuration workflow orchestrator. Develop locally (Jupyter or your favorite editor), deploy to Airflow or Kubernetes.

Project description

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Ploomber is the simplest way to build reliable data pipelines for Data Science and Machine Learning. Provide your source code in a standard form, and Ploomber automatically constructs the pipeline for you. Tasks can be anything from Python functions, Jupyter notebooks, Python/R/shell scripts, and SQL scripts.

When you're ready, deploy to Airflow or Kubernetes (using Argo) without code changes.

Here's how pipeline tasks look like:

Function Jupyter notebook or Python script SQL script Pipeline declaration
def clean_users(product, upstream):
    # run 'get_users' before this function.
    # upstream['get_users'] returns the output
    # of such task, used as input here
    df = pd.read_csv(upstream['get_users'])

    # your code here...

    # save output using the provided
    # product variable
# + tags=["parameters"]
# run 'clean users' and 'clean_activity'
# before this script/notebook
upstream = ['clean_users', 'clean_activity']
# -

# a new cell is injected here with
# the product variable
# e.g., product = '/path/output.csv'
# and a new upstream variable:
# e.g., upstream = {'clean_users': '/path/...'
#                   'clean_activity': '/another/...'}

# your code here...

# save output using the provided product variable
-- {{product}} is replaced by the table name
CREATE TABLE AS {{product}}
run 'raw_data' before this task. Replace
{{upstream['raw_data']}} with table name
at runtime
SELECT * FROM {{upstream['raw_data']}}
  # function
  - source: functions.clean_users
    product: output/users-clean.csv

  # python script (or notebook)
  - source: notebooks/
      model: output/model.pickle
      nb: output/model-evaluation.html

  # sql script
  - source: scripts/some_script.sql
    product: [schema, name, table]
    client: db.get_client



pip install ploomber

Compatible with Python 3.6 and higher.

Try it out!

You can choose from one of the hosted options:

image image

Or run locally:

# ML pipeline example
ploomber examples --name ml-basic
cd ml-basic

# if using pip
pip install -r requirements.txt

# if using conda
conda env create --file environment.yml
conda activate ml-basic

# run pipeline
ploomber build

Pipeline output saved in the output/ folder. Check out the pipeline definition in the pipeline.yaml file.

To get a list of examples, run ploomber examples.

Main features

  1. Jupyter integration. When you open your notebooks, Ploomber will automatically inject a new cell with the location of your input files, as inferred from your upstream variable. If you open a Python or R script, it's converted to a notebook on the fly.
  2. Incremental builds. Speed up execution by skipping tasks whose source code hasn't changed.
  3. Parallelization. Run tasks in parallel to speed up computations.
  4. Pipeline testing. Run tests upon task execution to verify that the output data has the right properties (e.g., values within expected range).
  5. Pipeline inspection. Start an interactive session with ploomber interact to debug your pipeline. Call dag['task_name'].debug() to start a debugging session.
  6. Deployment to Kubernetes and Airflow. You can develop and execute locally. Once you are ready to deploy, export to Kubernetes or Airflow.

How does Ploomber compare to X?

Ploomber has two goals:

  1. Provide an excellent development experience for Data Science/Machine learning projects, which require a lot of experimentation/iteration: incremental builds and Jupyter integration are a fundamental part of this.
  2. Integrate with deployment tools (Airflow and Argo) to streamline deployment.

For a complete comparison, read our survey on workflow management tools.


0.10.1 (2021-04-17)

  • DAGSpec warns if parameter declared in env but unused
  • Implements {SQLDump, NotebookRunner, PythonCallable}.load()
  • File.client downloads during task execution instead of render
  • Adds ploomber.OnlineModel, which provides a simpler API than OnlineDAG for models that implement a .predict() method
  • Adds function to find package name if using standard layout

0.10 (2021-03-13)

  • Changes extract_product default in spec API to False
  • Tasks get a default name equal to the filename without extension (e.g., -> plot)
  • File saves metadata in a .{filename}.metadata file instead of {filename}.source
  • Adds ploomber examples command
  • Adds Deployment guide to documentation
  • EnvDict loads env.yaml and uses values as defaults when passing a custom dict
  • Simpler repr for SQL products
  • Improved Spec API docs
  • Adds ploomber.tasks.TaskGroup.from_params to create multiple tasks at once

0.9.5 (2021-03-07)

  • Changes a lot of error messages for clarity
  • Clearer __repr__ for Placeholder, File, and MetaProduct
  • Default placeholders can be used in pipeline.yaml without defining env.yaml
  • Better formatting for displaying DAG build and render errors
  • Spec API initializes task spec as SQLDump if product has suffix .csv or .parquet
  • Coloring CLI error traceback
  • Spec API skips SourceLoader if passing an absolute path
  • DAG.clients validates keys (using DAGClients)
  • params available as hook argument
  • Rewritten Spec API documentation

0.9.4 (2021-02-15)

  • Better display of errors when building or rendering a DAG (layout and colors)
  • File implements the os.PathLike interface (this works now: pandas.read_parquet(File('file.parquet')))
  • Several error messages refactored for clarity
  • Adds DAGSpec.find() to automatically find pipeline.yaml

0.9.3 (2021-02-13)

  • Adds OnlineDAG to convert DAG objects for in-memory inference
  • Spec API (pipeline.yaml) supports DAG-level and Task-level serializer and serializer
  • CLI looks for src/{pkg}/pipeline.yaml if pipeline.yaml doesn't exist
  • Adds {{cwd}} placeholder for env.yaml that expands to current working directory

0.9.2 (2021-02-11)

  • Support for Python 3.9
  • SQLAlchemyClient now accepts an argument to pass custom parameters to sqlalchemy.create_engine
  • Temporarily pins papermill version due to an incompatibility with jupytext and nbformat (jupytext does not support cell ids yet)
  • Adds --on-finish/-of to ploomber task to execute the on_finish hook
  • DAGs with R notebooks can render even if the ir kernel is not installed

0.9.1 (2021-02-01)

  • File now supports a client argument to upload products to cloud storage
  • Adds GCloudStorageClient
  • Fixes error that caused jupyter to fail to initialize the dag when adding a function to a module already included in the YAML spec
  • Fixes IPython namespace errors when using ploomber interact
  • Adds ploomber.testing.sql.assert_no_duplicates_in_column to check for record duplicates and optionally show duplicates statistics
  • Deprecates a few internal methods:, DAG.to_dict(), Task.to_dict()
  • Improvements to SQL static analyzer to warn when relations created by a SQL script do not match Product
  • A few changes to Metadata (internal API) to cover some edge cases
  • Warning when Product metadata is corrupted
  • Adds new meta.import_tasks_from option in YAML specs to import tasks from another file

0.9 (2021-01-18)

  • Deprecates ploomber new and ploomber add
  • Adds ploomber scaffold
  • Jupyter plugin now exports functions as notebooks using jupyter_functions_as_notebooks in pipeline.yaml

0.8.6 (2021-01-08)

  • ploomber add generates template tasks and functions if they don't exist
  • Jupyter plugin now shows PythonCallable tasks as notebooks

0.8.5 (2020-12-14)

  • Documentation tutorials re-organization and CSS fixes
  • Improvements to the InMemoryDAG API
  • Minor bug fixes
  • File.__repr__ shows a relative path whenever possible

0.8.4 (2020-11-21)

  • Adds support for passing glob-like patterns in ploomber build (via DAGSpec.from_directory)

0.8.3 (2020-11-15)

  • Full Windows compatibility
  • Adds documentation to show how to customize notebook output using nbconvert
  • Improvements to introductory tutorials
  • Adds --debug/-d option to ploomber build to drop a debugger if an exception happens
  • Ensuring all dag-level, task-level and product-level clients are closed after is done
  • Minor bug fixes

0.8.2 (2020-10-31)

  • Removes matplotlib from dependencies, now using IPython.display for inline plotting
  • Fixes bug that caused custom args to {PythonCallable, NotebookRunner}.develop(args="--arg=value") not to be sent correctly to the subprocess
  • NotebookRunner (initialized from ipynb) only considers the actual code as its source, ignores the rest of the JSON contents
  • Fixes bug when EnvDict was initialized from another EnvDict
  • PythonCallableSource can be initialized with dotted paths
  • DAGSpec loads env.yaml when initialized with a YAML spec and there is a env.yaml file in the spec parent folder
  • DAGSpec converts relative paths in sources to be so to the project's root folder
  • Adds lazy_import to DAGspec, to avoid importing PythonCallable sources (passes the dotted paths as strings instead)

0.8.1 (2020-10-18)

  • ploomber interact allows to switch DAG parameters, just like ploomber build
  • Adds PythonCallable.develop() to develop Python functions interactively
  • NotebookRunner.develop() to develop now also works with Jupyter lab

0.8 (2020-10-15)

  • Dropping support for Python 3.5
  • Removes DAGSpec.from_file, loading from a file is now handled directly by the DAGSpec constructor
  • Performance improvements, DAG does not fetch metadata when it doesn't need to
  • Factory functions: Bool parameters with default values are now represented as flags when called from the CLI
  • CLI arguments to replace values from env.yaml are now built with double hyphens instead of double underscores
  • NotebookRunner creates parent folders for output file if they don't exist
  • Bug fixes

0.7.5 (2020-10-02)

  • NotebookRunner.develop accepts passing arguments to jupyter notebook
  • Spec API now supports PythonCallable (by passing a dotted path)
  • Upstream dependencies of PythonCallables can be inferred via the extract_upstream option in the Spec API
  • Faster DAG.render(force=True) (avoid checking metadata when possible)
  • Faster notebook rendering when using the extension thanks to the improvement above
  • data_frame_validator improvement: validate_schema can now validate optional columns dtypes
  • Bug fixes

0.7.4 (2020-09-14)

  • Improved __repr__ methods in PythonCallableSource and NotebookSource
  • Improved output layout for tables
  • Support for nbconvert>=6
  • Docstrings are parsed from notebooks and displayed in DAG status table (#242)
  • Jupyter extension now works for DAGs defined via directories (via ENTRY_POINT env variable)
  • Adds Jupyter integration guide to documentation
  • Several bug fixes

0.7.3 (2020-08-19)

  • Improved support for R notebooks (.Rmd)
  • New section for testing.sql module in the documentation

0.7.2 (2020-08-17)

  • New guides: parametrized pipelines, SQL templating, pipeline testing and debugging
  • NotebookRunner.debug(kind='pm') for post-mortem debugging
  • Fixes bug in Jupyter extension when the pipeline has a task whose source is not a file (e.g. SQLDump)
  • Fixes a bug in the CLI custom arg parser that caused dynamic params not to show up
  • DAGspec now supports SourceLoader
  • Docstring (from dotted path entry point) is shown in the CLI summary
  • Customized sphinx build to execute guides from notebooks

0.7.1 (2020-08-06)

  • Support for R
  • Adding section on R pipeline to the documentation
  • Construct pipeline from a directory (no need to write a pipeline.yaml file)
  • Improved error messages when DAG fails to initialize (jupyter notebook app)
  • Bug fixes
  • CLI accepts factory function parameters as positional arguments, types are inferred using type hints, displayed when calling --help
  • CLI accepts env variables (if any), displayed when calling --help

0.7 (2020-07-30)

  • Simplified CLI (breaking changes)
  • Refactors internal API for notebook conversion, adds tests for common formats
  • Metadata is deleted when saving a script from the Jupyter notebook app to make sure the task runs in the next pipeline build
  • SQLAlchemyClient now supports custom tokens to split source

0.6.3 (2020-07-24)

  • Adding --log option to CLI commands
  • Fixes a bug that caused the dag variable not to be exposed during interactive sessions
  • Fixes ploomber task forced run
  • Adds SQL pipeline tutorial to get started docs
  • Minor CSS changes to docs

0.6.2 (2020-07-22)

  • Support for env.yaml in pipeline.yaml
  • Improved CLI. Adds plot, report and task commands`

0.6.1 (2020-07-20)

  • Changes pipeline.yaml default (extract_product: True)
  • Documentation re-design
  • Simplified ploomber new generated files
  • Ability to define product in SQL scripts
  • Products are resolved to absolute paths to avoid ambiguity
  • Bug fixes

0.6 (2020-07-08)

  • Adds Jupyter notebook extension to inject parameters when opening a task
  • Improved CLI ploomber new, ploomber add and ploomber entry
  • Spec API documentation additions
  • Support for on_finish, on_failure and on_render hooks in spec API
  • Improved validation for DAG specs
  • Several bug fixes

0.5.1 (2020-06-30)

  • Reduces the number of required dependencies
  • A new option in DBAPIClient to split source with a custom separator

0.5 (2020-06-27)

  • Adds CLI
  • New spec API to instantiate DAGs using YAML files
  • NotebookRunner.debug() for debugging and .develop() for interacive development
  • Bug fixes

0.4.1 (2020-05-19)

  • PythonCallable.debug() now works in Jupyter notebooks

0.4.0 (2020-05-18)

  • PythonCallable.debug() now uses IPython debugger by default
  • Improvements to public API
  • Moves hook triggering logic to Task to simplify executors implementation
  • Adds DAGBuildEarlyStop exception to signal DAG execution stop
  • New option in Serial executor to turn warnings and exceptions capture off
  • Adds Product.prepare_metadata hook
  • Implements hot reload for notebooks and python callables
  • General clean ups for old __str__ and __repr__ in several modules
  • Refactored ploomber.sources module and ploomber.placeholders (previously ploomber.templates)
  • Adds NotebookRunner.debug() and NotebookRunner.develop()
  • NotebookRunner: now has an option to run static analysis on render
  • Adds documentation for DAG-level hooks
  • Bug fixes

0.3.5 (2020-05-03)

  • Bug fixes #88, #89, #90, #84, #91
  • Modifies Env API: Env() is now Env.load(), Env.start() is now Env()
  • New advanced Env guide added to docs
  • Env can now be used with a context manager
  • Improved DAGConfigurator API
  • Deletes logger configuration in executors constructors, logging is available via DAGConfigurator

0.3.4 (2020-04-25)

  • Dependencies cleanup
  • Removed (numpydoc) as dependency, now optional
  • A few bug fixes: #79, #71
  • All warnings are captured and shown at the end (Serial executor)
  • Moves differ parameter from DAG constructor to DAGConfigurator

0.3.3 (2020-04-23)

  • Cleaned up some modules, deprecated some rarely used functionality
  • Improves documentation aimed to developers looking to extend ploomber
  • Introduces DAGConfigurator for advanced DAG configuration [Experimental API]
  • Adds task to upload files to S3 (ploomber.tasks.UploadToS3), requires boto3
  • Adds DAG-level on_finish and on_failure hooks
  • Support for enabling logging in entry points (via --logging)
  • Support for starting an interactive session using entry points (via python -i -m)
  • Improved support for database drivers that can only send one query at a time
  • Improved repr for SQLAlchemyClient, shows URI (but hides password)
  • PythonCallable now validates signature against params at render time
  • Bug fixes

0.3.2 (2020-04-07)

  • Faster Product status checking, now performed at rendering time
  • New products: GenericProduct and GenericSQLRelation for Products that do not have a specific implementation (e.g. you can use Hive with the DBAPI client + GenericSQLRelation)
  • Improved DAG build reports, subselect columns, transform to pandas.DataFrame and dict
  • Parallel executor now returns build reports, just like the Serial executor

0.3.1 (2020-04-01)

  • DAG parallel executor
  • Interact with pipelines from the command line (entry module)
  • Bug fixes
  • Refactored access to Product.metadata

0.3 (2020-03-20)

  • New Quickstart and User Guide section in documentation
  • DAG rendering and build now continue until no more tasks can render/build (instead of failing at the first exception)
  • New @with_env and @load_env decorators for managing environments
  • Env expansion ({{user}} expands to the current, also {{git}} and {{version}} available)
  • is now optional when Task is initialized with a source that has __name__ attribute (Python functions) or a name attribute (like Placeholders returned from SourceLoader)
  • New Task.on_render hook
  • Bug fixes
  • A lot of new tests
  • Now compatible with Python 3.5 and higher

0.2.1 (2020-02-20)

  • Adds integration with pdb via PythonCallable.debug
  • Env.start now accepts a filename to look for
  • Improvements to data_frame_validator

0.2 (2020-02-13)

  • Simplifies installation
  • Deletes BashCommand, use ShellScript
  • More examples added
  • Refactored env module
  • Renames SQLStore to SourceLoader
  • Improvements to SQLStore
  • Improved documentation
  • Renamed PostgresCopy to PostgresCopyFrom
  • SQLUpload and PostgresCopy have now the same API
  • A few fixes to PostgresCopy (#1, #2)


  • First release

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