print what caused the erroe python code example

Example 1: python exception

try:
  # code block
except ValueError as ve:
  print(ve)

Example 2: python defualt error handler

import sys
def my_except_hook(exctype, value, traceback):
    if exctype == KeyboardInterrupt:
        print "Handler code goes here"
    else:
        sys.__excepthook__(exctype, value, traceback)
sys.excepthook = my_except_hook