Without going through your exact steps, I'm taking a wild guess here, but it looks like the pycrypto library got attached to the built-in python (which is good), but when you double click on the script it's running itself using the python you installed (/usr/local/bin/pythonw).
Try running the script from a fresh Terminal window.
e.g.
Code:
/usr/bin/python /Users/eric/Desktop/ineptepub.py