Add support for inference of method arguments

This MR closes #409 (closed).

• A new test has been added to ensure that method arguments are inferred correctly, complementing the same functionality for functions
• A new function is provided, utils._infer_args_from_function_except_n_args to allow an arbitrary number of arguments to be ignored.
• utils.infer_parameters_from_function has been updated to infer if a passed argument is a function or a method (or will raise a ValueError if it is neither.

The behaviour of utils.infer_parameters_from_function may not be considered optimal, as it will fail in the case that an object with a __call__() method is passed as an argument. If you're keen for this form to be supported I can add an additional case for it.

added 2 commits

• c4a66ec6 - Add a test for method argument inference.
• 82bcd9c9 - Tidy up documentation on new functions.

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• 901dd819 - Attempt to fix flake8 issues.

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• df0460e4 - Removed trailing whitespace... from docstrings...

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unmarked as a Work In Progress

changed the description

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• 0995d176 - It helps a lot when you write your tests properly...

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• acf1986b - Changed things to stop breaking EVERYTHING.

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• 5707f827 - Changed the _infer_..._first_arg method to use generic n_arg function.

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changed milestone to %0.5.9

added Feature-request label

resolved all threads

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• ace1c8d5 - Removed inline comments.

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So hopefully ace1c8d5 should resolve any remaining issue with excessive inline comments.

approved this merge request

approved this merge request

mentioned in commit b04498c6

merged

Nice work, thanks @daniel-williams