@lazyproperty
    def columns(self):
        return _ColumnCollection(self._tbl, self)
Guard against old python versions.
dataset/ETHPy150Open scanny/python-pptx/pptx/shapes/table.py/Table.columns--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/python-compat-runtime/appengine-compat/exported_appengine_sdk/wrapper_util.py/reject_old_python_versions