def METHOD_NAME( self, _line ):
    "Plot topology colored by node placement"
    # Import networkx if needed
    global nx, plt, graphviz_layout
    if not nx:
        try:
            # pylint: disable=import-error,no-member
            # pylint: disable=import-outside-toplevel
            import networkx
            nx = networkx  # satisfy pylint
            from matplotlib import pyplot
            plt = pyplot   # satisfy pylint
            import pygraphviz
            assert pygraphviz  # silence pyflakes
            # Networkx moved this around
            if hasattr( nx, 'graphviz_layout' ):
                graphviz_layout = nx.graphviz_layout
            else:
                graphviz_layout = nx.drawing.nx_agraph.graphviz_layout
            # pylint: enable=import-error,no-member
        except ImportError:
            error( 'plot requires networkx, matplotlib and pygraphviz - '
                   'please install them and try again\n' )
            return
    # Make a networkx Graph
    g = nx.Graph()
    mn = self.mn
    servers = getattr( mn, 'servers', [ 'localhost' ] )
    hosts, switches = mn.hosts, mn.switches
    nodes = hosts + switches
    g.add_nodes_from( nodes )
    links = [ ( link.intf1.node, link.intf2.node )
              for link in self.mn.links ]
    g.add_edges_from( links )
    # Pick some shapes and colors
    # shapes = hlen * [ 's' ] + slen * [ 'o' ]
    color = dict( zip( servers, self.colorsFor( servers ) ) )
    # Plot it!
    pos = graphviz_layout( g )
    opts = { 'ax': None, 'font_weight': 'bold',
             'width': 2, 'edge_color': 'darkblue' }
    hcolors = [ color[ getattr( h, 'server', 'localhost' ) ]
                for h in hosts ]
    scolors = [ color[ getattr( s, 'server', 'localhost' ) ]
                for s in switches ]
    nx.draw_networkx( g, pos=pos, nodelist=hosts, node_size=800,
                      label='host', node_color=hcolors, node_shape='s',
                      **opts )
    nx.draw_networkx( g, pos=pos, nodelist=switches, node_size=1000,
                      node_color=scolors, node_shape='o', **opts )
    # Get rid of axes, add title, and show
    fig = plt.gcf()
    ax = plt.gca()
    ax.get_xaxis().set_visible( False )
    ax.get_yaxis().set_visible( False )
    fig.canvas.set_window_title( 'Mininet')
    plt.title( 'Node Placement', fontweight='bold' )
    plt.show()