def get_keys(self):
        keys = []
        for base_class, sub_class in self.get_valid_classes():
            keys += self._content[base_class][sub_class].keys()
        return keys
Given a filename or path of a template file, return the same without the
dataset/ETHPy150Open moloney/dcmstack/src/dcmstack/dcmmeta.py/DcmMetaExtension.get_keys--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/docs/version_extensions.py/remove_extension