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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 view_xy(self, negative=False):
 """View the XY plane"""

        vec = np.array([0,0,1])
        viewup = np.array([0,1,0])
        if negative:
            vec = np.array([0,0,-1])
        return self.view_vector(vec, viewup)