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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getprop(self, prop_name):
 """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. """

        return self.shell(
            ['getprop', prop_name],
            timeout=DEFAULT_GETPROP_TIMEOUT_SEC).decode('utf-8').strip()