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49 lines
2.9 KiB
ReStructuredText
49 lines
2.9 KiB
ReStructuredText
=========================
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Error / Violation Codes
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=========================
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Flake8 and its plugins assign a code to each message that we refer to as a
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:term:`error code` (or :term:`violation`). Most plugins will list their error
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codes in their documentation or README.
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Flake8 installs ``pycodestyle``, ``pyflakes``, and ``mccabe`` by default and
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generates its own :term:`error code`\ s for ``pyflakes``:
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+------+---------------------------------------------------------------------+
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| Code | Example Message |
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+======+=====================================================================+
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| F401 | ``module`` imported but unused |
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+------+---------------------------------------------------------------------+
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| F402 | import ``module`` from line ``N`` shadowed by loop variable |
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+------+---------------------------------------------------------------------+
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| F403 | 'from ``module`` import \*' used; unable to detect undefined names |
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+------+---------------------------------------------------------------------+
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| F404 | future import(s) ``name`` after other statements |
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+------+---------------------------------------------------------------------+
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| F405 | ``name`` may be undefined, or defined from star imports: ``module`` |
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+------+---------------------------------------------------------------------+
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+------+---------------------------------------------------------------------+
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| F811 | redefinition of unused ``name`` from line ``N`` |
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+------+---------------------------------------------------------------------+
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| F812 | list comprehension redefines ``name`` from line ``N`` |
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+------+---------------------------------------------------------------------+
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| F821 | undefined name ``name`` |
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+------+---------------------------------------------------------------------+
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| F822 | undefined name ``name`` in __all__ |
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+------+---------------------------------------------------------------------+
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| F823 | local variable ``name`` ... referenced before assignment |
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+------+---------------------------------------------------------------------+
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| F831 | duplicate argument ``name`` in function definition |
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+------+---------------------------------------------------------------------+
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| F841 | local variable ``name`` is assigned to but never used |
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+------+---------------------------------------------------------------------+
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``mccabe`` only ever reports one :term:`violation` - ``C901`` based on the
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complexity value provided by the user.
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Users should also reference `pycodestyle's list of error codes`_.
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.. links
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.. _pycodestyle's list of error codes:
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https://pycodestyle.readthedocs.io/en/latest/intro.html#error-codes
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