polygon point order

[DWendou]

from pypex.poly2d import polygon
a = [[0,1],[1,2],[3,4],[5, 6],[5,3]]
poly = polygon.Polygon(a)
print(a) # [[0,1],[1,2],[3,4],[5, 6],[5,3]]
print(poly) # [[1 2], [0 1], [5 3], [5 6], [3 4]]

Why are the points in different order

[mikecokina]

@DWendou , points are automatically sorted in clockwise direction.