code: def getprop(self, prop_name):
          
          return self.shell(
              ['getprop', prop_name],
              timeout=DEFAULT_GETPROP_TIMEOUT_SEC).decode('utf-8').strip()
docs: Get a property of the device.
  
          This is a convenience wrapper for "adb shell getprop xxx".
  
          Args:
              prop_name: A string that is the name of the property to get.
  
          Returns:
              A string that is the value of the property, or None if the property
              doesn't exist.