IPython debugger. This is a slightly changed ipdb code.

debug.py

# This is a slightly changed ipdb (http://pypi.python.org/pypi/ipdb) code.
# Shell creation was moved to the set_trace function, because the issue
# with standart unittest module. Now it is usable.

try:
    import sys
    from  IPython.Debugger import Pdb
    from IPython import ipapi
    from IPython.Shell import IPShell

    def set_trace():
        shell = IPShell(argv=[])
        ip = ipapi.get()
        Pdb(ip.options.colors).set_trace(sys._getframe().f_back)

except ImportError:
    from pdb import set_trace