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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 location_once_scrolled_into_view(self):
 """THIS PROPERTY MAY CHANGE WITHOUT WARNING. Use this to discover where on the screen an element is so that we can click it. This method should cause the element to be scrolled into view. Returns the top lefthand corner location on the screen, or ``None`` if the element is not visible. """

        if self._w3c:
            old_loc = self._execute(Command.W3C_EXECUTE_SCRIPT, {
                'script': "arguments[0].scrollIntoView(true); return arguments[0].getBoundingClientRect()",
                'args': [self]})['value']
            return {"x": round(old_loc['x']),
                    "y": round(old_loc['y'])}
        else:
            return self._execute(Command.GET_ELEMENT_LOCATION_ONCE_SCROLLED_INTO_VIEW)['value']