flake8-strict

Flake8 plugin that checks Python code against a set of opinionated style rules.

Compatible with Python 2.7, 3.3+, PyPy 2.6+ and PyPy 2.4+.

PyPI page: https://pypi.python.org/pypi/flake8_strict

GitHub page: https://github.com/smarkets/flake8-strict

To install using PyPI and pip:

pip install flake8-strict

Error codes

• S100: First argument on the same line
• S101: Multi-line construct missing trailing comma

Limitations

• only source code without print statements is supported, this means:
  • all valid Python 3 code
  • Python 2 code with print_function enabled
• the existing checks are quite basic, they'll be improved and new ones will added
• line/column numbers are off currently

• code like this will cause a parsing error (lib2to3.pgen2.parse.ParseError: bad input):

  some_name(
      x for x in range(1),
  )

  It's ironic but the trailing comma is the issue here, without it parsing works ok:

  some_name(
      x for x in range(1)
  )

  This is a limitation of the underlying parser library and is unlikely to be fixed in near future. Suggested workaround: wrap the generator in parentheses, like this:

  some_name(
      (x for x in range(1)),
  )

  If the function being called is dict or set the function calls can be replaced with dict and set comprehensions therefore avoiding the issue completely.

Versioning and backwards compatibility

Below 1.0.0: no guarantees. Above 1.0.0, given a version number MAJOR.MINOR.PATCH:

• MAJOR is updated when backwards incompatible changes happen
• MINOR is updated when a new, backwards compatible, features are introduced
• PATCH is updated when a backwards compatible bug fixes are applied

Changes

0.2.1

• Fix blib2to3 import

0.2.0

• Use custom lib2to3 for better support for Python 3.6+
• Fix trailing comma after args/*kwargs for Python 3.6+
• Allow usage of Python 3.6 features (e.g f-strings) without crashing

0.1.9

• Fixed elements inside class definition not being linted correctly (issue #36)

0.1.8

• Revert previous change (0.1.7) due to a lib2to3 issue.

0.1.7

• Fixed trailing comma after args/*kwargs for Python 3.6+ (issue #25)

0.1.6

• Fixed decorator arguments not being linted.
• Fixed multiline imports not being linted.
• Fixed class definitions not being linted.

0.1.5

• Fixed UnicodeDecodeError if file contains non-ascii symbols (issue #22)
• Fixed error if newline is omitted from end of file (issue #18)
• Fixed erroneous comma suggested when unpacking function parameter (issue #21)

0.1.4

• Fixed handling of one-element lists (#15)

0.1.3

• Fixed reading from stdin
• Fixed not being able to run when pycodestyle, not pep8, is installed (pep8 has been renamed to pycodestyle and flake8 2.6.0+ doesn't trigger pep8 installation anymore)
• Added support for set, list and dict literals and comprehensions
• Function calls with single, multi-line arguments are now treated more reasonably

0.1.2

• Fixed a "ValueError: need more than 2 values to unpack" error (GitHub issue #1).
• Fixed handling argument lists with keyword-only arguments (compatibility with PEP 3102), this now doesn't raise S101 in this case as it would be a syntax error.

0.1.1

• Fixed few AttributeError: 'Node' object has no attribute 'lineno' errors

0.1.0

First release

License

Copyright (C) 2015 Smarkets Limited <support@smarkets.com>

This module is released under the MIT License: http://www.opensource.org/licenses/mit-license.php (or see the LICENSE file)