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E[0] is the infinity point of the curve, i.e. (0:1:0). More generally, you can get points (defined over F) using the square brackets: E[i]. The class is implemented such that E[0] will be always the infinity point.

It is hard to calculate the points of elliptic curve over large fields so it will take some time to display E[0] even though we know it will be the infinity point.