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BasPH committed May 12, 2019
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103 changes: 99 additions & 4 deletions README.rst
@@ -1,6 +1,101 @@
.. raw:: html
##############
Pylint-Airflow
##############

<img src="images/pylint-airflow.png" align="right" />
.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
:alt: Code style: Black
:target: https://github.com/ambv/black

.. Split in README_noraw because PyPi doesn't allow the raw directive.
.. include:: README_noraw.rst
.. image:: https://img.shields.io/badge/License-MIT-blue.svg
:alt: License: MIT
:target: https://github.com/BasPH/airflow-examples/blob/master/LICENSE

.. image:: https://img.shields.io/circleci/project/github/BasPH/pylint-airflow/master.svg
:target: https://circleci.com/gh/BasPH/workflows/pylint-airflow/tree/master

.. image:: images/pylint-airflow.png
:align: right

Pylint plugin for static code analysis on Airflow code.

*****
Usage
*****

Installation:

.. code-block:: bash
pip install pylint-airflow
Usage:

.. code-block:: bash
pylint --load-plugins=pylint_airflow [your_file]
This plugin runs on Python 3.6 and higher.

***********
Error codes
***********

The Pylint-Airflow codes follow the structure ``{I,C,R,W,E,F}83{0-9}{0-9}``, where:

- The characters show:

- ``I`` = Info
- ``C`` = Convention
- ``R`` = Refactor
- ``W`` = Warning
- ``E`` = Error
- ``F`` = Fatal

- ``83`` is the base id (see all here https://github.com/PyCQA/pylint/blob/master/pylint/checkers/__init__.py)
- ``{0-9}{0-9}`` is any number 00-99

The current codes are:

+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Code | Symbol | Description |
+=======+===================================+=================================================================================================================================================================+
| C8300 | different-operator-varname-taskid | For consistency assign the same variable name and task_id to operators. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| C8301 | match-callable-taskid | For consistency name the callable function '_[task_id]', e.g. PythonOperator(task_id='mytask', python_callable=_mytask). |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| C8302 | mixed-dependency-directions | For consistency don't mix directions in a single statement, instead split over multiple statements. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| C8303 | task-no-dependencies | Sometimes a task without any dependency is desired, however often it is the result of a forgotten dependency. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| C8304 | task-context-argname | Indicate you expect Airflow task context variables in the \*\*kwargs argument by renaming to \*\*context. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| C8305 | task-context-separate-arg | To avoid unpacking kwargs from the Airflow task context in a function, you can set the needed variables as arguments in the function. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| C8306 | match-dagid-filename | For consistency match the DAG filename with the dag_id. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| R8300 | unused-xcom | Return values from a python_callable function or execute() method are automatically pushed as XCom. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| W8300 | basehook-top-level | Airflow executes DAG scripts periodically and anything at the top level of a script is executed. Therefore, move BaseHook calls into functions/hooks/operators. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| E8300 | duplicate-dag-name | DAG name should be unique. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| E8301 | duplicate-task-name | Task name within a DAG should be unique. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| E8302 | duplicate-dependency | Task dependencies can be defined only once. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| E8303 | dag-with-cycles | A DAG is acyclic and cannot contain cycles. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| E8304 | task-no-dag | A task must know a DAG instance to run. |
+-------+-----------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+

*************
Documentation
*************

Documentation is available on `Read the Docs <https://pylint-airflow.readthedocs.io>`_.

************
Contributing
************

Suggestions for more checks are always welcome, please create an issue on GitHub. Read `CONTRIBUTING.rst <https://github.com/BasPH/pylint-airflow/blob/master/CONTRIBUTING.rst>`_ for more details.
98 changes: 0 additions & 98 deletions README_noraw.rst

This file was deleted.

2 changes: 1 addition & 1 deletion setup.py
Expand Up @@ -5,7 +5,7 @@

requirements = ["pylint"]

readme = Path(__file__).resolve().parent / "README_noraw.rst"
readme = Path(__file__).resolve().parent / "README.rst"
with open(readme) as f:
long_description = f.read()

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