fixtures.py 文件源码

def setUp(self):
        super(CaptureStandardIO, self).setUp()
        self.patcher = MonkeyPatcher()
        self.addCleanup(self.patcher.restore)
        # Patch sys.std* and self.std*. Use TextIOWrapper to provide an
        # identical API to the "real" stdin, stdout, and stderr objects.
        self._addStream("stdin", self._wrapStream(self._buf_in))
        self._addStream("stdout", self._wrapStream(self._buf_out))
        self._addStream("stderr", self._wrapStream(self._buf_err))
        self.patcher.patch()