[Tutor] Alter print action for objects

[Shrutarshi Basu]

I'm working on a graph class to become more familiar with graphs in
general. I'd like to be able to do something like 'print gr'  and get
something intelligible like a list of vertices. But using print on a
Graph class instance simply returns <Graph instance at some_hex_addr>
Is there someway I can change what print prints?

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