shell_layout(G, nlist=None, rotate=None, scale=1, center=None, dim=2)¶Position nodes in concentric circles.G (NetworkX graph or list of nodes) – A position will be assigned to every node in G.nlist (list of lists) – List of node lists for each shell. rotate (angle in radians (default=pi/len(nlist))) – Angle by which to rotate the starting position of each shell relative to the starting position of the previous shell. To recreate behavior before v2.5 use rotate=0.scale (number (default: 1)) – Scale factor for positions. center (array-like or None) – Coordinate pair around which to center the layout. dim (int) – Dimension of layout, currently only dim=2 is supported. Other dimension values result in a ValueError. pos – A dictionary of positions keyed by node- Return typeValueError – If dim ! = 2>>> G = nx.path_graph(4) >>> shells = [, [1, 2, 3]] >>> pos = nx.shell_layout(G, shells) This algorithm currently only works in two dimensions and does not try to minimize edge crossings.