from __future__ import print_function

def trace(frame, event, arg):
    print("ZZ", event)
    if event == "exception":
        from traceback import format_exception
        print(event, arg)
        print("-------------------------------")
        print("".join(format_exception(*arg)))
        #print("".join(format_exception(*arg, chain=False)))
        print("-------------------------------")

    return trace

import sys
sys.settrace(trace)

def f():
    x = 5
    x.invalid

f()