<｜begin▁of▁sentence｜>### Instruction:
Given the need to execute Python commands in a classic python shell environment within an igraph application, can you use the ClassicPythonShell's __call__ method to print 'Hello, world!' to the console?
### Response:
from igraph.app.shell import ClassicPythonShell
shell = ClassicPythonShell()
shell('print(\'Hello, world!\')')
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