Q:

Raise unhandlable exception in Python

I have a Python program that handles (excepts) all the exceptions raised by external files.  I want an exception that will be thrown from the try block and except will not silence it. 

A:

In 2.7 you can just do the following.  I'm not sure about python 3.x but I would assume it is the same. 
try:
    # something
except IOError:
    # display error
except:
    raise

