| Name | flake8-no-pep420 JSON |
| Version |
2.9.0
JSON |
| download |
| home_page | None |
| Summary | A flake8 plugin to ban PEP-420 implicit namespace packages. |
| upload_time | 2025-09-08 23:44:12 |
| maintainer | None |
| docs_url | None |
| author | None |
| requires_python | >=3.9 |
| license | None |
| keywords |
flake8
|
| VCS |
 |
| bugtrack_url |
|
| requirements |
No requirements were recorded.
|
| Travis-CI |
No Travis.
|
| coveralls test coverage |
No coveralls.
|
================
flake8-no-pep420
================
.. image:: https://img.shields.io/github/actions/workflow/status/adamchainz/flake8-no-pep420/main.yml.svg?branch=main&style=for-the-badge
:target: https://github.com/adamchainz/flake8-no-pep420/actions?workflow=CI
.. image:: https://img.shields.io/pypi/v/flake8-no-pep420.svg?style=for-the-badge
:target: https://pypi.org/project/flake8-no-pep420/
.. image:: https://img.shields.io/badge/code%20style-black-000000.svg?style=for-the-badge
:target: https://github.com/psf/black
.. image:: https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white&style=for-the-badge
:target: https://github.com/pre-commit/pre-commit
:alt: pre-commit
A `flake8 <https://flake8.readthedocs.io/en/latest/>`_ plugin to ban `PEP-420 <https://www.python.org/dev/peps/pep-0420/>`__ implicit namespace packages.
----
**Linting a Django project?**
Check out my book `Boost Your Django DX <https://adamchainz.gumroad.com/l/byddx>`__ which covers Flake8 and many other code quality tools.
----
Requirements
============
Python 3.9 to 3.14 supported.
Installation
============
First, install with ``pip``:
.. code-block:: sh
python -m pip install flake8-no-pep420
Second, if you define Flake8’s ``select`` setting, add the ``INP`` prefix to it.
Otherwise, the plugin should be active by default.
Rationale
=========
Implicit namespace packages are directories of Python files without an ``__init__.py``.
They’re valid and importable, but they break some tools:
* unittest test discovery, unless |-s (--start-directory)|__ points to the namespace package.
By extension, this affects Django’s test runner too.
.. |-s (--start-directory)| replace:: ``-s`` (``--start-directory``)
__ https://docs.python.org/3/library/unittest.html#cmdoption-unittest-discover-s
* Coverage.py, unless |report.include_namespace_packages|__ is enabled.
.. |report.include_namespace_packages| replace:: ``report.include_namespace_packages``
__ https://coverage.readthedocs.io/en/latest/config.html#report-include-namespace-packages
* pytest (`Issue #5147 <https://github.com/pytest-dev/pytest/issues/5147>`__)
In most cases, tools fail silently, which can lead to a false sense of security:
* Tests may look legitimate but never run
* Code may be untested but not appear in coverage statistics
PEP-420’s algorithm is non-trivial which is probably why such tools haven’t (yet) implemented it.
Rules
=====
INP001: File is part of an implicit namespace package. Add __init__.py?
-----------------------------------------------------------------------
flake8-no-pep420 will trigger this on the first line of any file that sits in a directory without an ``__init__.py`` file.
Often projects have a few root files *not* in packages, for which an ``__init__.py`` file should not be added.
For example, Django projects normally have a ``manage.py`` file in the root of their repository.
In these cases you can ignore the ``INP001`` error.
It’s possible to use ``# noqa: INP001`` to ignore the error in-line, but this isn’t possible if the first line is a `shebang <https://en.wikipedia.org/wiki/Shebang_(Unix)>`__, such as in Django’s ``manage.py``.
In such cases it’s preferable to use Flake8’s `per-file-ignores option <https://flake8.pycqa.org/en/latest/user/options.html#cmdoption-flake8-per-file-ignores>`__, for example in ``setup.cfg``:
.. code-block:: ini
[flake8]
# ...
per-file-ignores =
manage.py:INP001
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"description": "================\nflake8-no-pep420\n================\n\n.. image:: https://img.shields.io/github/actions/workflow/status/adamchainz/flake8-no-pep420/main.yml.svg?branch=main&style=for-the-badge\n :target: https://github.com/adamchainz/flake8-no-pep420/actions?workflow=CI\n\n.. image:: https://img.shields.io/pypi/v/flake8-no-pep420.svg?style=for-the-badge\n :target: https://pypi.org/project/flake8-no-pep420/\n\n.. image:: https://img.shields.io/badge/code%20style-black-000000.svg?style=for-the-badge\n :target: https://github.com/psf/black\n\n.. image:: https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white&style=for-the-badge\n :target: https://github.com/pre-commit/pre-commit\n :alt: pre-commit\n\nA `flake8 <https://flake8.readthedocs.io/en/latest/>`_ plugin to ban `PEP-420 <https://www.python.org/dev/peps/pep-0420/>`__ implicit namespace packages.\n\n----\n\n**Linting a Django project?**\nCheck out my book `Boost Your Django DX <https://adamchainz.gumroad.com/l/byddx>`__ which covers Flake8 and many other code quality tools.\n\n----\n\nRequirements\n============\n\nPython 3.9 to 3.14 supported.\n\nInstallation\n============\n\nFirst, install with ``pip``:\n\n.. code-block:: sh\n\n python -m pip install flake8-no-pep420\n\nSecond, if you define Flake8\u2019s ``select`` setting, add the ``INP`` prefix to it.\nOtherwise, the plugin should be active by default.\n\nRationale\n=========\n\nImplicit namespace packages are directories of Python files without an ``__init__.py``.\nThey\u2019re valid and importable, but they break some tools:\n\n* unittest test discovery, unless |-s (--start-directory)|__ points to the namespace package.\n By extension, this affects Django\u2019s test runner too.\n\n .. |-s (--start-directory)| replace:: ``-s`` (``--start-directory``)\n __ https://docs.python.org/3/library/unittest.html#cmdoption-unittest-discover-s\n\n* Coverage.py, unless |report.include_namespace_packages|__ is enabled.\n\n .. |report.include_namespace_packages| replace:: ``report.include_namespace_packages``\n __ https://coverage.readthedocs.io/en/latest/config.html#report-include-namespace-packages\n\n* pytest (`Issue #5147 <https://github.com/pytest-dev/pytest/issues/5147>`__)\n\nIn most cases, tools fail silently, which can lead to a false sense of security:\n\n* Tests may look legitimate but never run\n* Code may be untested but not appear in coverage statistics\n\nPEP-420\u2019s algorithm is non-trivial which is probably why such tools haven\u2019t (yet) implemented it.\n\nRules\n=====\n\nINP001: File is part of an implicit namespace package. Add __init__.py?\n-----------------------------------------------------------------------\n\nflake8-no-pep420 will trigger this on the first line of any file that sits in a directory without an ``__init__.py`` file.\n\nOften projects have a few root files *not* in packages, for which an ``__init__.py`` file should not be added.\nFor example, Django projects normally have a ``manage.py`` file in the root of their repository.\nIn these cases you can ignore the ``INP001`` error.\nIt\u2019s possible to use ``# noqa: INP001`` to ignore the error in-line, but this isn\u2019t possible if the first line is a `shebang <https://en.wikipedia.org/wiki/Shebang_(Unix)>`__, such as in Django\u2019s ``manage.py``.\nIn such cases it\u2019s preferable to use Flake8\u2019s `per-file-ignores option <https://flake8.pycqa.org/en/latest/user/options.html#cmdoption-flake8-per-file-ignores>`__, for example in ``setup.cfg``:\n\n.. code-block:: ini\n\n [flake8]\n # ...\n per-file-ignores =\n manage.py:INP001\n",
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