IEP does not print anything after entering a debug mode

[Kuang Sk]

I have encountered something really strange. By the default shell configuration, IEP use Ipython if available. As the screenshot below, once I type the magic command %debug in IEP, the color of the command prompt changes, the number following the prompt is gone, nothing can be printed to the screen. It seems that the output is redirected to somewhere else. 

When I launcha an Ipython alone and type %debug, it is supposed to complain that "No traceback has been produced"

Anyone knows why?

[Almar Klein]

You probably want to use IEP's debugging system instead. A debugger
usually has its own mini event loop, which in the case of using
IPython's debugger holds up the IDE-kernel communication.

You can type ``db`` to get a list of comments (most actions can also be
applied via the GUI).

- Almar

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