Method __aenter__

Lib/test/test_coroutines.py:1210–1213

(self)

                self.name = name

            async def __aenter__(self):
                await AsyncYieldFrom(['enter-1-' + self.name,
                                      'enter-2-' + self.name])
                return self

            async def __aexit__(self, *args):
                await AsyncYieldFrom(['exit-1-' + self.name,