def stub(self, obj, attr=None):
        s = stub(obj, attr)
        if s not in self._stubs:
            self._stubs.append(s)
        return s
Generate the data to be placed into a _version.py file.
dataset/ETHPy150Open agoragames/chai/chai/chai.py/ChaiBase.stub--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/python/_release.py/generateVersionFileData