<｜begin▁of▁sentence｜>### Instruction:
Given a Classic Python Shell instance, how can you retrieve the shell's progress handler, update the progress to 50%, and mark it as complete?
### Response:
from ClassicPythonShell import ClassicPythonShell

# Initialize the Classic Python Shell
cps = ClassicPythonShell()

# Get the progress handlerprogress_handler = cps.get_progress_handler()

# If a progress handler exists, utilize it.if progress_handler:
    progress_handler.update_progress(50)  # Update progress to 50%
    progress_handler.complete()         # Mark the progress as complete
<|EOT|>
