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Flake8 is a Python linting utility that wraps PyFlakes, pycodestyle, and Mccabe to check your Python or Jupiter Notebook code for style and logical errors.

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Supported Files

Flake8 will run on files with the following extensions:
  • *.py
  • *.ipynb (using nbqa)

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Configuration

Flake8 supports the following config files:
  • .flake8
CodeRabbit will not run Flake8 if no config file is found.

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When we skip Flake8

CodeRabbit will skip running Flake8 when:
  • No config file is found (.flake8).
  • Flake8 is already running in GitHub workflows.

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Excluded codes

The following Flake8 codes are automatically excluded (style and whitespace issues that won’t cause runtime errors):
  • E501 - line too long
  • E302, E303, E305 - blank line issues
  • W291, W292, W293, W391 - whitespace issues
  • E201, E202, E203, E211 - whitespace around brackets
  • E221, E222, E225, E226, E227, E228 - whitespace around operators
  • E231, E241, E242, E251 - whitespace around commas
  • E261, E262 - inline comment spacing
  • E271, E272, E273, E274, E275 - whitespace around keywords
  • E301, E304, E306 - blank line issues
  • E401, E402, E411 - import grouping issues
  • E502 - redundant backslash
  • W191 - indentation contains tabs
  • E266 - too many leading ’#’ for block comment

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Profile behavior

In Chill mode, Flake8 filters out warnings and conventions, reporting only errors. In Assertive mode, all findings (errors, warnings, and conventions) are reported.

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Features

Flake8 can detect many issues such as:
  • Style violations (PEP 8)
  • Logical errors and unused imports
  • Code complexity issues
  • Syntax errors
  • And many more