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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 get_default(self):
 """ Return the default value to use when validating data if no input is provided for this field. If a default has not been set for this field then this will simply return `empty`, indicating that no value should be set in the validated data for this field. """

        if self.default is empty:
            raise SkipField()
        if callable(self.default):
            if hasattr(self.default, 'set_context'):
                self.default.set_context(self)
            return self.default()
        return self.default