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Expand Up @@ -49,7 +49,7 @@ PyLint with checks for common mistakes and issues in Python code specifically in
You can install this project via `pip`:

```bash
pip install databricks-labs-pylint-plugin
pip install pylint-plugin-for-databricks
```

and then use it with `pylint`:
Expand All @@ -58,7 +58,7 @@ and then use it with `pylint`:
pylint --load-plugins=databricks.labs.pylint.all <your-python-file>.py
```

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# Integration with Databricks CLI

Expand All @@ -82,7 +82,7 @@ Or you can specify a `--path` flag to lint a specific notebook or folder:
databricks labs pylint-plugin nbcheck --path /Users/[email protected]/PrepareData
```

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# PyLint Ecosystem

Expand All @@ -97,7 +97,7 @@ with the following PyLint integrations:
- [Azure DevOps Task](https://marketplace.visualstudio.com/items?itemName=dazfuller.pylint-task) (MIT License)
- [GitLab CodeClimate](https://pypi.org/project/pylint-gitlab/) (GPLv3 License)

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# Why not (just) Ruff?

Expand All @@ -109,67 +109,67 @@ a [feature parity with PyLint](https://github.com/astral-sh/ruff/issues/970) yet
the most comprehensive code analysis. You can try using Ruff and [just the checkers from this plugin](#testing-in-isolation)
in the same CI pipeline and pre-commit hook.

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# Automated code analysis

Every check has a code, that follows an [existing convention](https://github.com/pylint-dev/pylint/blob/v3.1.0/pylint/checkers/__init__.py#L5-L41):
- `{I,C,R,W,E,F}89{0-9}{0-9}`, where `89` is the base ID for this plugin.
- `{I,C,R,W,E,F}` mean for `Info`, `Convention`, `Refactor`, `Warning`, `Error`, and `Fatal`.

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<!-- CHECKS -->

## `databricks-airflow` checker

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### `W8901`: `missing-data-security-mode`

XXX cluster missing `data_security_mode` required for Unity Catalog compatibility. Before you enable Unity Catalog, you must set the `data_security_mode` to 'NONE', so that your existing jobs would keep the same behavior. Failure to do so may cause your jobs to fail with unexpected errors.

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### `W8902`: `unsupported-runtime`

XXX cluster has unsupported runtime: XXX. The runtime version is not supported by Unity Catalog. Please upgrade to a runtime greater than or equal to 11.3.

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## `databricks-dbutils` checker

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### `R8903`: `dbutils-fs-cp`

Use Databricks SDK instead: w.dbfs.copy(XXX, XXX). Migrate all usage of dbutils to Databricks SDK. See the more detailed documentation at https://databricks-sdk-py.readthedocs.io/en/latest/workspace/files/dbfs.html

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### `R8904`: `dbutils-fs-head`

Use Databricks SDK instead: with w.dbfs.download(XXX) as f: f.read(). Migrate all usage of dbutils to Databricks SDK. See the more detailed documentation at https://databricks-sdk-py.readthedocs.io/en/latest/workspace/files/dbfs.html

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### `R8905`: `dbutils-fs-ls`

Use Databricks SDK instead: w.dbfs.list(XXX). Migrate all usage of dbutils to Databricks SDK. See the more detailed documentation at https://databricks-sdk-py.readthedocs.io/en/latest/workspace/files/dbfs.html

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### `R8906`: `dbutils-fs-mount`

Mounts are not supported with Unity Catalog, switch to using Unity Catalog Volumes instead. Migrate all usage to Unity Catalog

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### `R8907`: `dbutils-credentials`

Credentials utility is not supported with Unity Catalog. Migrate all usage to Unity Catalog

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### `R8908`: `dbutils-notebook-run`

Expand All @@ -179,73 +179,73 @@ Use Databricks SDK instead: w.jobs.submit(
task_key=...)
]).result(timeout=timedelta(minutes=XXX)). Migrate all usage of dbutils to Databricks SDK. See the more detailed documentation at https://databricks-sdk-py.readthedocs.io/en/latest/workspace/jobs/jobs.html

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### `R8909`: `pat-token-leaked`

Use Databricks SDK instead: from databricks.sdk import WorkspaceClient(); w = WorkspaceClient(). Do not hardcode secrets in code, use Databricks SDK instead, which natively authenticates in Databricks Notebooks. See more at https://databricks-sdk-py.readthedocs.io/en/latest/authentication.html

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### `R8910`: `internal-api`

Do not use internal APIs, rewrite using Databricks SDK: XXX. Do not use internal APIs. Use Databricks SDK for Python: https://databricks-sdk-py.readthedocs.io/en/latest/index.html

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## `databricks-legacy` checker

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### `R8911`: `legacy-cli`

Don't use databricks_cli, use databricks.sdk instead: pip install databricks-sdk. Migrate all usage of Legacy CLI to Databricks SDK. See the more detailed documentation at https://databricks-sdk-py.readthedocs.io/en/latest/index.html

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### `W8912`: `incompatible-with-uc`

Incompatible with Unity Catalog: XXX. Migrate all usage to Databricks Unity Catalog. Use https://github.com/databrickslabs/ucx for more details

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## `databricks-notebooks` checker

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### `C8913`: `notebooks-too-many-cells`

Notebooks should not have more than 75 cells. Otherwise, it's hard to maintain and understand the notebook for other people and the future you

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### `R8914`: `notebooks-percent-run`

Using %run is not allowed. Use functions instead of %run to avoid side effects and make the code more testable. If you need to share code between notebooks, consider creating a library. If still need to call another code as a separate job, use Databricks SDK for Python: https://databricks-sdk-py.readthedocs.io/en/latest/index.html

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## `spark` checker

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### `C8915`: `spark-outside-function`

Using spark outside the function is leading to untestable code. Do not use global spark object, pass it as an argument to the function instead, so that the function becomes testable in a CI/CD pipelines.

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### `C8917`: `use-display-instead-of-show`

Rewrite to display in a notebook: display(XXX). Use display() instead of show() to visualize the data in a notebook.

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### `W8916`: `no-spark-argument-in-function`

Function XXX is missing a 'spark' argument. Function refers to a global spark variable, which may not always be available. Pass the spark object as an argument to the function instead, so that the function becomes testable in a CI/CD pipelines.

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## Testing in isolation
To test this plugin in isolation, you can use the following command:
Expand All @@ -254,7 +254,7 @@ To test this plugin in isolation, you can use the following command:
pylint --load-plugins=databricks.labs.pylint.all --disable=all --enable=missing-data-security-mode,unsupported-runtime,dbutils-fs-cp,dbutils-fs-head,dbutils-fs-ls,dbutils-fs-mount,dbutils-credentials,dbutils-notebook-run,pat-token-leaked,internal-api,legacy-cli,incompatible-with-uc,notebooks-too-many-cells,notebooks-percent-run,spark-outside-function,use-display-instead-of-show,no-spark-argument-in-function .
```

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<!-- END CHECKS -->

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