How to use the pydeps.colors function in pydeps

def get_colors(self, src, colorspace=None):
        if colorspace is None:
            if src.basename not in self.colors:
                h = self.curhue
                # self.curhue += 7  # relative prime with 360
                self.curhue += 37  # relative prime with 360
                self.curhue %= 360
                # print "NAME:", src.name, "BASENAME:", src.basename
                bg = colors.name2rgb(h)
                black = (0, 0, 0)
                white = (255, 255, 255)
                fg = colors.foreground(bg, black, white)
                self.colors[src.basename] = bg, fg
            return self.colors[src.basename]
        else:
            return colorspace.color(src)

visited.add(a)
                visited.add(b)

            space = colors.ColorSpace(visited)
            for src in sorted(visited):
                bg, fg = depgraph.get_colors(src, space)
                kwargs = {}

                if src.name in depgraph.cyclenodes:
                    kwargs['shape'] = 'octagon'

                ctx.write_node(
                    src.name,
                    label=src.get_label(splitlength=14,
                                        rmprefix=self.kw.get('rmprefix')),
                    fillcolor=colors.rgb2css(bg),
                    fontcolor=colors.rgb2css(fg),
                    **kwargs
                )

        return ctx.text()

def _pydeps(trgt, **kw):
    # Pass args as a **kw dict since we need to pass it down to functions
    # called, but extract locally relevant parameters first to make the
    # code prettier (and more fault tolerant).
    colors.START_COLOR = kw.get('start_color')
    show_cycles = kw.get('show_cycles')
    nodot = kw.get('nodot')
    no_output = kw.get('no_output')
    output = kw.get('output')
    fmt = kw['format']
    show_svg = kw.get('show')
    reverse = kw.get('reverse')
    if os.getcwd() != trgt.workdir:
        # the tests are calling _pydeps directoy
        os.chdir(trgt.workdir)

    dep_graph = py2depgraph.py2dep(trgt, **kw)

    if kw.get('show_deps'):
        cli.verbose("DEPS:")
        pprint.pprint(dep_graph)

# b imports a
                aname = a.name
                bname = b.name
                if (bname, aname) in drawn:
                    continue
                drawn.add((bname, aname))

                ctx.write_rule(
                    aname, bname,
                    weight=depgraph.proximity_metric(a, b),
                    minlen=depgraph.dissimilarity_metric(a, b))

                visited.add(a)
                visited.add(b)

            space = colors.ColorSpace(visited)
            for src in sorted(visited):
                bg, fg = depgraph.get_colors(src, space)
                kwargs = {}

                if src.name in depgraph.cyclenodes:
                    kwargs['shape'] = 'octagon'

                ctx.write_node(
                    src.name,
                    label=src.get_label(splitlength=14,
                                        rmprefix=self.kw.get('rmprefix')),
                    fillcolor=colors.rgb2css(bg),
                    fontcolor=colors.rgb2css(fg),
                    **kwargs
                )

for aname, bname in depgraph.cyclerelations:
                try:
                    a = depgraph.sources[aname]
                    b = depgraph.sources[bname]
                except KeyError:
                    continue
                drawn.add((bname, aname))
                ctx.write_rule(
                    bname, aname,
                    weight=depgraph.proximity_metric(a, b),
                    minlen=depgraph.dissimilarity_metric(a, b),
                )
                visited.add(a)
                visited.add(b)

            space = colors.ColorSpace(visited)
            for src in visited:
                bg, fg = depgraph.get_colors(src, space)
                kwargs = {}

                if src.name in depgraph.cyclenodes:
                    kwargs['shape'] = 'octagon'

                ctx.write_node(
                    src.name, label=src.label,
                    fillcolor=colors.rgb2css(bg),
                    fontcolor=colors.rgb2css(fg),
                    **kwargs
                )

        return ctx.text()

minlen=depgraph.dissimilarity_metric(a, b),
                )
                visited.add(a)
                visited.add(b)

            space = colors.ColorSpace(visited)
            for src in visited:
                bg, fg = depgraph.get_colors(src, space)
                kwargs = {}

                if src.name in depgraph.cyclenodes:
                    kwargs['shape'] = 'octagon'

                ctx.write_node(
                    src.name, label=src.label,
                    fillcolor=colors.rgb2css(bg),
                    fontcolor=colors.rgb2css(fg),
                    **kwargs
                )

        return ctx.text()