Generate graph file with depenndencies map tree

def dependencies(self, deps_dict):
        """Generate graph file with depenndencies map tree
        """
        try:
            import pygraphviz as pgv
        except ImportError:
            graph_easy, comma = "", ""
            if (self.image == "ascii" and
                    not os.path.isfile("/usr/bin/graph-easy")):
                comma = ","
                graph_easy = " graph-easy"
            print("Require 'pygraphviz{0}{1}': Install with 'slpkg -s sbo "
                  "pygraphviz{1}'".format(comma, graph_easy))
            raise SystemExit()
        if self.image != "ascii":
            self.check_file()
        try:
            G = pgv.AGraph(deps_dict)
            G.layout(prog="fdp")
            if self.image == "ascii":
                G.write("{0}.dot".format(self.image))
                self.graph_easy()
            G.draw(self.image)
        except IOError:
            raise SystemExit()
        if os.path.isfile(self.image):
            print("Graph image file '{0}' created".format(self.image))
        raise SystemExit()