@classmethod
    def add_importer(cls, importer):
        if not issubclass(importer, AbstractEnamlImporter):
            msg = ('An Enaml importer must be a subclass of '
                   'AbstractEnamlImporter. Got %s instead.')
            raise TypeError(msg % importer)
        importers = cls.__importers
        if importer not in importers:
            importers.append(importer)
Add an importer to the list of importers for use with the
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/core/import_hooks.py/imports.add_importer