<｜begin▁of▁sentence｜>### Instruction:
As an intercultural trainer, imagine you have been tasked with teaching a group of software engineers about using the igraph shell environment. How would you guide them through executing a simple command, such as printing 'Hello, world!' within this shell programmatically?
### Response:
from igraph.app.shell import ClassicPythonShell

# Create an instance of the classic Python shell
shell = ClassicPythonShell()

# Call the shell to simulate user input (in this case, printing 'Hello, world!')
shell('print("Hello, world!")')
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