gistfile1.txt

pmroddy@mroddy-local-vm:~$ python
Python 2.7.3 (default, Apr 10 2013, 05:46:21) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> int.__add__ = lambda x: 5
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't set attributes of built-in/extension type 'int'