def keys(self):
        return self.attributes.keys()
L{_checkCPython} returns C{True} when C{platform.python_implementation}
dataset/ETHPy150Open tony/vcspull/vcspull/repo/base.py/BaseRepo.keys--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/python/test/test_dist.py/WithPlatformTests.test_cpython