<｜begin▁of▁sentence｜>### Instruction:
Given an instance of the Shell class, can the `get_progress_handler` method be used to check whether a progress handler is set for the instance?
### Response:
from Shell import Shell

# Assuming Shell is a class within a module
shell_instance = Shell()
progress_handler = shell_instance.get_progress_handler()

if progress_handler is not None:
    print('A progress handler exists.')
else:
    print('There is no progress handler.')
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