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2D Points, best paractive to store Points

sage: from sage.plot.point import Point
sage: P = Point([1,2],[2,3],{'alpha':.5})
sage: P
Point set defined by 2 point(s)
sage: P.options()['alpha']
sage: P.xdata
[1, 2]

Why is this not working:

sage: P = Point([1,2],[2,3])

Why do I need this alpha Parameter?