def render(self, data, label=None, filename="Graph", directory="graphs", view=True):
"""Graphviz rendering."""
# create the Graphviz graph
graph_attr = self.graph_attr.copy()
if label is not None:
graph_attr['label'] = self._escape_label(label)
graph = gv.Digraph(graph_attr=graph_attr, node_attr=self.node_attr, edge_attr=self.edge_attr)
# draw nodes and edges of the Graphviz graph
self._graph = graph
self._rendered = set()
self._render(data)
self._graph = None
self._rendered = None
# display the Graphviz graph
graph.format = "pdf"
graph.render(f"{filename}.gv", directory, view, cleanup=True)
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