# 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']
0.500000000000000
sage: P.xdata
[1, 2]
```

Why is this not working:

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

Why do I need this alpha Parameter?