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pandas-dev-flaker

Plugin for flake8 used to contribute to pandas.

NOTE: this is not a linter meant for pandas usage, but for pandas development. If you want a linter for pandas usage, please see pandas-vet.

installation

pip install pandas-dev-flaker

flake8 codes

Code	Description
PDF001	found import from 'collections.abc' (use 'from collections import abc')
PDF002	builtin 'filter' function used
PDF003	builtin 'exec' function used
PDF004	'foo.__class__' used, (use 'type(foo)' instead)
PDF005	leading space in concatenated strings
PDF006	Found '{foo!r}' formatted value (instead, use 'repr(foo)')
PDF007	line split in two unnecessarily by 'black' formatter
PDF008	found 'os.remove' (use 'tm.ensure_clean' instead)
PDF009	'pytest.raises' used without 'match='
PDF010	'pytest.raises' used outside of context manager
PDF011	found 'pytest.warns' (use 'pandas._testing.assert_produces_warning')
PDF012	found 'pytest.xfail' (use 'pytest.mark.xfail' instead)
PDF013	import from 'conftest' found
PDF014	found import from 'pandas._testing' (use 'import pandas._testing as tm')
PDF015	from import from 'pandas.testing' (use 'import pandas._testing as tm')
PDF016	found 'unittest.mock' (use 'pytest.monkeypatch' instead)
PDF017	'pd.api.types' used (import from 'pandas.api.types' instead)
PDF018	'common' imported from 'pandas.core' without 'com' alias
PDF019	found both 'pd.foo' and 'foo' in the same file
PDF020	found private import across modules
PDF021	found 'np.bool' or 'np.object' (use 'np.bool_' or 'np.object_' instead)
PDF022	found import from 'numpy.random'
PDF023	found assignment to single-letter variable
PDF024	found string join() with generator expressions
PDF025	found 'np.testing' or 'np.array_equal' (use 'pandas._testing' instead)
PDF026	found union between Series and AnyArrayLike in type hint

contributing

See contributing.md for how to get started.

Each new linting rule should be its own file inside pandas-dev-flaker/_plugins. Please linting rule should have two sets of tests in pandas-dev-flaker/tests - one for when the linting rule is expected to pass, and another for when it's expected to fail.

credit

Several methods are simplified versions of methods from pyupgrade. Some of the checks were taken from the pandas repo. Please find both their licenses in the LICENSES folder.

as a pre-commit hook

See pre-commit for instructions

Sample .pre-commit-config.yaml:

-   repo: https://github.com/pycqa/flake8
    rev: 3.9.0
    hooks:
    -   id: flake8
        additional_dependencies: [pandas-dev-flaker==0.5.0]

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License

pandas-dev/pandas-dev-flaker

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