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            "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
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        "description": "# Cohesion\n\n[![Build Status](https://travis-ci.org/mschwager/cohesion.svg?branch=master)](https://travis-ci.org/mschwager/cohesion)\n[![Build Status](https://ci.appveyor.com/api/projects/status/github/mschwager/cohesion?branch=master&svg=true)](https://ci.appveyor.com/project/mschwager/cohesion/branch/master)\n[![Coverage Status](https://coveralls.io/repos/github/mschwager/cohesion/badge.svg?branch=master)](https://coveralls.io/github/mschwager/cohesion?branch=master)\n[![Python Versions](https://img.shields.io/pypi/pyversions/cohesion.svg)](https://img.shields.io/pypi/pyversions/cohesion.svg)\n[![PyPI Version](https://img.shields.io/pypi/v/cohesion.svg)](https://img.shields.io/pypi/v/cohesion.svg)\n\nCohesion is a tool for measuring Python class cohesion.\n\n> In computer programming, cohesion refers to the degree to which the elements\n> of a module belong together. Thus, cohesion measures the strength of\n> relationship between pieces of functionality within a given module. For\n> example, in highly cohesive systems functionality is strongly related.\n> - [Wikipedia](https://en.wikipedia.org/wiki/Cohesion_(computer_science))\n\n> When cohesion is high, it means that the methods and variables of the class\n> are co-dependent and hang together as a logical whole.\n> - Clean Code pg. 140\n\nSome of the advantages of high cohesion, also by Wikipedia:\n\n* Reduced module complexity (they are simpler, having fewer operations).\n* Increased system maintainability, because logical changes in the domain\n  affect fewer modules, and because changes in one module require fewer\n  changes in other modules.\n* Increased module reusability, because application developers will find\n  the component they need more easily among the cohesive set of operations\n  provided by the module.\n\n# Installing\n\n```\n$ python -m pip install cohesion\n$ cohesion -h\n```\n\nOR\n\n```\n$ git clone https://github.com/mschwager/cohesion.git\n$ cd cohesion\n$ PYTHONPATH=lib/ python -m cohesion -h\n```\n\n# Using\n\nCohesion measures class and instance variable usage across the methods\nof that class.\n\n```\n$ cat example.py\nclass ExampleClass1(object):\n    class_variable1 = 5\n    class_variable2 = 6\n\n    def func1(self):\n        self.instance_variable = 6\n\n        def inner_func(b):\n            return b + 5\n\n        local_variable = self.class_variable1\n\n        return local_variable\n\n    def func2(self):\n        print(self.class_variable2)\n\n    @staticmethod\n    def func3(variable):\n        return variable + 7\n\nclass ExampleClass2(object):\n    def func1(self):\n        self.instance_variable1 = 7\n```\n\n```\n$ cohesion --files example.py --verbose\nFile: example.py\n  Class: ExampleClass1 (1:0)\n    Function: func1 2/3 66.67%\n      Variable: class_variable1 True\n      Variable: class_variable2 False\n      Variable: instance_variable True\n    Function: func2 1/3 33.33%\n      Variable: class_variable1 False\n      Variable: class_variable2 True\n      Variable: instance_variable False\n    Function: func3 0/3 0.00%\n      Variable: class_variable1 False\n      Variable: class_variable2 False\n      Variable: instance_variable False\n    Total: 33.33%\n  Class: ExampleClass2 (23:0)\n    Function: func1 1/1 100.00%\n      Variable: instance_variable1 True\n    Total: 100.00%\n```\n\nThe `--below` and `--above` flags can be specified to only show classes with\na cohesion value below or above the specified percentage, respectively.\n\n## Flake8 Support\n\nCohesion supports being run by `flake8`. First, ensure your installation has\nregistered `cohesion`:\n\n```\n$ flake8 --version\n3.2.1 (pyflakes: 1.0.0, cohesion: 0.8.0, pycodestyle: 2.2.0, mccabe: 0.5.3) CPython 2.7.12 on Linux\n```\n\nAnd now use `flake8` to lint your file:\n\n```\n$ flake8 example.py\nexample.py:1:1: H601 class has low cohesion\n```\n\n## Python Versions\n\nIf you would like to simultaneously run Cohesion on Python 2 and Python 3\ncode then you will have to install it for both versions. I.e.\n\n```\n$ python2 -m pip install cohesion\n$ python3 -m pip install cohesion\n```\n\nThen use the corresponding version to run the module:\n\n```\n$ python2 -m cohesion --files python2_file.py\n$ python3 -m cohesion --files python3_file.py\n```\n\n# Developing\n\nFirst, install development packages:\n\n```\n$ python -m pip install -r requirements-dev.txt\n```\n\n## Testing\n\n```\n$ nose2\n```\n\n## Linting\n\n```\n$ flake8\n```\n\n## Coverage\n\n```\n$ nose2 --with-coverage\n```\n\n\n",
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