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+McCabe complexity checker
+=========================
+
+Ned's script to check McCabe complexity.
+
+This module provides a plugin for ``flake8``, the Python code checker.
+
+
+Installation
+------------
+
+You can install, upgrade, uninstall ``mccabe`` with these commands::
+
+ $ pip install mccabe
+ $ pip install --upgrade mccabe
+ $ pip uninstall mccabe
+
+
+Standalone script
+-----------------
+
+The complexity checker can be used directly::
+
+ $ python -m mccabe --min 5 mccabe.py
+ ("185:1: 'PathGraphingAstVisitor.visitIf'", 5)
+ ("71:1: 'PathGraph.to_dot'", 5)
+ ("245:1: 'McCabeChecker.run'", 5)
+ ("283:1: 'main'", 7)
+ ("203:1: 'PathGraphingAstVisitor.visitTryExcept'", 5)
+ ("257:1: 'get_code_complexity'", 5)
+
+
+Plugin for Flake8
+-----------------
+
+When both ``flake8 2.0`` and ``mccabe`` are installed, the plugin is
+available in ``flake8``::
+
+ $ flake8 --version
+ 2.0 (pep8: 1.4.2, pyflakes: 0.6.1, mccabe: 0.2)
+
+By default the plugin is disabled. Use the ``--max-complexity`` switch to
+enable it. It will emit a warning if the McCabe complexity of a function is
+higher that the value::
+
+ $ flake8 --max-complexity 10 coolproject
+ ...
+ coolproject/mod.py:1204:1: C901 'CoolFactory.prepare' is too complex (14)
+
+This feature is quite useful to detect over-complex code. According to McCabe,
+anything that goes beyond 10 is too complex.
+
+
+Links
+-----
+
+* Feedback and ideas: http://mail.python.org/mailman/listinfo/code-quality
+
+* Cyclomatic complexity: http://en.wikipedia.org/wiki/Cyclomatic_complexity.
+
+* Ned Batchelder's script:
+ http://nedbatchelder.com/blog/200803/python_code_complexity_microtool.html
+
+
+Changes
+-------
+
+0.6.1 - 2017-01-26
+``````````````````
+
+* Fix signature for ``PathGraphingAstVisitor.default`` to match the signature
+ for ``ASTVisitor``
+
+0.6.0 - 2017-01-23
+``````````````````
+
+* Add support for Python 3.6
+
+* Fix handling for missing statement types
+
+0.5.3 - 2016-12-14
+``````````````````
+
+* Report actual column number of violation instead of the start of the line
+
+0.5.2 - 2016-07-31
+``````````````````
+
+* When opening files ourselves, make sure we always name the file variable
+
+0.5.1 - 2016-07-28
+``````````````````
+
+* Set default maximum complexity to -1 on the class itself
+
+0.5.0 - 2016-05-30
+``````````````````
+
+* PyCon 2016 PDX release
+
+* Add support for Flake8 3.0
+
+0.4.0 - 2016-01-27
+``````````````````
+
+* Stop testing on Python 3.2
+
+* Add support for async/await keywords on Python 3.5 from PEP 0492
+
+0.3.1 - 2015-06-14
+``````````````````
+
+* Include ``test_mccabe.py`` in releases.
+
+* Always coerce the ``max_complexity`` value from Flake8's entry-point to an
+ integer.
+
+0.3 - 2014-12-17
+````````````````
+
+* Computation was wrong: the mccabe complexity starts at 1, not 2.
+
+* The ``max-complexity`` value is now inclusive. E.g.: if the
+ value is 10 and the reported complexity is 10, then it passes.
+
+* Add tests.
+
+
+0.2.1 - 2013-04-03
+``````````````````
+
+* Do not require ``setuptools`` in setup.py. It works around an issue
+ with ``pip`` and Python 3.
+
+
+0.2 - 2013-02-22
+````````````````
+
+* Rename project to ``mccabe``.
+
+* Provide ``flake8.extension`` setuptools entry point.
+
+* Read ``max-complexity`` from the configuration file.
+
+* Rename argument ``min_complexity`` to ``threshold``.
+
+
+0.1 - 2013-02-11
+````````````````
+* First release
+
+