khard/carddav_object.py
def _add_category(self, categories):
        """ categories variable must be a list """
        categories_obj = self.vcard.add('categories')
        categories_obj.value = helpers.convert_to_vcard(
            "category", categories, ObjectType.list_with_strings)
def _add_category(self, categories):
        """ categories variable must be a list """
        categories_obj = self.vcard.add('categories')
        categories_obj.value = helpers.convert_to_vcard(
            "category", categories, ObjectType.list_with_strings)
categories variable must be a list