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Trying the various marker shapes described in the

• matplotlib documentation page for marker shapes

it seems that vertex_shape='_' and vertex_shape='|' work well:

sage: P.show(vertex_color='white', vertex_shape='_')
sage: P.show(vertex_color='white', vertex_shape='|')

in that (for me at least) they result in what could be expected from vertex_shape='None'.