Move validation code to a new validators.py module #169
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Refactoring for readability. This pull request moves code for validating input data and arguments to a new "validators.py" module.
validators.py has two classes:
DataValidator: code for checking the datasetInputValidator: code for checking the arguments (should I have called this something likeArgumentValidator?)The old validation code did some type manipulation (e.g. if groupby was provided as a list, it would be silently converted to a str). I have removed this code for now, and will work out what to do with it later.