def __init__(self, device):
        self._device = device
        self.data = None
Runs a shell command and captures the stdout and stderr output.
dataset/ETHPy150Open home-assistant/home-assistant/homeassistant/components/sensor/dweet.py/DweetData.__init__--crossover with--dataset/ETHPy150Open oppia/oppia/scripts/backend_tests.py/run_shell_cmd