[Tutor] Using python 3 on Ubuntu 14.04

[Jim Byrnes]

I am in the process of moving from unbutu 12.04 to 14.04. I was doing 
some testing and got this:

jfb at Jims-1404:~$ cd MyProgs
jfb at Jims-1404:~/MyProgs$ cd passwords
jfb at Jims-1404:~/MyProgs/passwords$ python3 passwords.py
Traceback (most recent call last):
   File "passwords.py", line 8, in <module>
     from PythonCard import  model,clipboard
ImportError: No module named 'PythonCard'

If I simply start it with  python passwords.py  it runs fine. There is 
no need to use python 3 on this particular program but if I wanted to 
write for python 3 in the future what do I need to do to run programs 
with it?

Thanks,  Jim