I am a very experienced software developer, but not with CHIRP, or Python, or Ham radio, so I'm basically a newbie  here. I have written a new driver for the FT-4XR and (eventually) for its siblings. The module successfully reads the radio, but then fails to fill in the GUI memory structures. I tried to use pdb as described at

     https://docs.python.org/2/library/pdb.html

by inserting the following line at a point in my module:

    import pdb; pdb.set_trace()

The breakpoint is reached, the line after mhy breakpoint is printed,  and the (Pdb) prompt is shown on the console, but I cannot then type in a pdb command: characters are not shown on the console when typed and there is no evidence that the commands are being executed.

So, how do you guys debug? What am I doing wrong?