good first issuenew feature
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描述
Description of proposed feature
vertices = [1, 2, 3, 4]
edges = [(1, 2), (2, 3), (3, 4), (1, 3), (1, 4)]
g = Graph(vertices, edges)
assert isinstance(g[1], Dot) # This is OK
assert isinstance(g[(1, 2)], Line) # But this will raise a KeyError
imo This is confusing. Why not add a support for edge mapping?
How can the new feature be used?
Every time people want to get or set a edge, just write g[(1, 2)] instead of g.edges[(1, 2)].