<｜begin▁of▁sentence｜>### Instruction:
In the context of a network visualization project using networkx, can you demonstrate how to use the `ClassicPythonShell` class's `__call__` method to display the message 'Hello, world!' in the console while inspecting a graph structure?
### Response:
from igraph.app.shell import ClassicPythonShell
shell = ClassicPythonShell()
shell('print(\'Hello, world!\')')
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