Pylint Quote Checker

A Pylint plugin for checking the consistency of string quotes.

Example

before

Below is an example python file that uses inconsistent string quotes.

example.py

"""Example python file."""


def main(output="default"):
    '''Entrypoint to the example script which prints out the
    value in the 'output' variable.
    '''
    print(output)


if __name__ == "__main__":
    main('testing')

which would yield

➜ pylint --load-plugins pylint_quotes example.py 

No config file found, using default configuration
************* Module example
C:  4, 0: Invalid string quote ", should be ' (invalid-string-quote)
C: 11, 0: Invalid string quote ", should be ' (invalid-string-quote)
C:  5, 0: Invalid docstring quote ''', should be """ (invalid-docstring-quote)

-----------------------------------
Your code has been rated at 2.50/10

after

Fixing up the example above based on linting recommendations,

example.py

"""Example python file."""


def main(output='default'):
    """Entrypoint to the example script which prints out the
    value in the 'output' variable.
    """
    print(output)


if __name__ == '__main__':
    main('testing')

which yields

➜ pylint --load-plugins pylint_quotes example.py 

No config file found, using default configuration

-------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 2.50/10, +7.50)

Example Package

An example package is found in the example/ directory.

➜ pylint --load-plugins pylint_quotes example

************* Module foo.__init__
example/foo/__init__.py:3:0: C4001: Invalid string quote ", should be ' (invalid-string-quote)
************* Module foo
example/foo/__init__.py:1:0: C0102: Black listed name "foo" (blacklisted-name)
************* Module foo.other
example/foo/other.py:1:0: C4003: Invalid docstring quote ''', should be """ (invalid-docstring-quote)
example/foo/other.py:4:0: R0903: Too few public methods (1/2) (too-few-public-methods)
example/foo/other.py:10:0: C4002: Invalid triple quote """, should be ''' (invalid-triple-quote)
************* Module foo.utils
example/foo/utils.py:15:0: C4001: Invalid string quote ", should be ' (invalid-string-quote)
example/foo/utils.py:5:0: C4003: Invalid docstring quote ''', should be """ (invalid-docstring-quote)
example/foo/utils.py:10:0: C4003: Invalid docstring quote ''', should be """ (invalid-docstring-quote)

------------------------------------------------------------------
Your code has been rated at 1.11/10 (previous run: 1.11/10, +0.00)

Installation

Installing with pip:

pip install pylint-quotes

Installing with pipenev:

pipenv install pylint-quotes

Usage

To use pylint-quotes, it must loaded in as a plugin when running pylint

pylint --load-plugins pylint_quotes <module-or-package>

Checks

pylint-quotes provides a single StringQuoteChecker that checks for consistency between

• single quote string literals

  x = 'example'
  y = "example"

• triple quote strings

  """ single line block comments """
  '''
     multi-line block comments too
  '''
  
  x = '''example'''
  y = """
  example
  """

• docstrings (module, class, function, async function)

  def x():
      '''Example'''
      pass
      
  def y():
      """
          Multi-line example.
      """
      pass
  
  async def z():
      """Async example.
      """
      pass

Configuration

The string quote type can be configured as either 'single' or 'double' in the configuration file. For example, to check for single quote string literals, double quote triple quoted string, and double quoted docstrings,

string-quote=single
triple-quote=double
docstring-quote=double

the default configuration is

string-quote=single
triple-quote=single
docstring-quote=double

Additionally the string-quote can be configured to avoid escaping: by default it enforces one type but if using the other type would avoid some escaping then it enforces the other one. To use those smart types the config is 'single-avoid-escape', and 'double-avoid-escape'.

Developing

If you wish to develop the pylint-quotes project to fix a bug, add a feature, or extend it for your own uses, the Makefile provides a bunch of helpful development targets. For a full list of the targets, see the Makefile, or you can use make help.

For convenience, pipenv is used to manage development dependencies. Before starting development, you should make init to install pipenv if you don't already have it and create a virtualenv with the project development dependencies. From there, you can use:

• make test to run the unit tests
• make coverage to run unit tests and get a coverage report
• make lint to perform source code linting

License

Pylint-quotes is licensed under an MIT license -- see LICENSE for more info.