Debug in place

debug.py

import inspect

def debug():
    """
    Anywhere in the code:

        debug() # opens ipython shell
    """
    from IPython.terminal.embed import InteractiveShellEmbed
    ipshell = InteractiveShellEmbed()

    frame = inspect.currentframe().f_back
    msg = 'Stopped at {0.f_code.co_filename} at line {0.f_lineno}'.format(frame)

    # Go back one level!
    # This is needed because the call to ipshell is inside the function debug()
    ipshell(msg, stack_depth=2)