Python: Tkinter & turtle

Beginning programmer here. From How to Think Like a Computer scientist I got the following code: ``` #!/usr/bin/env python3 import turtle wn = turtle.Screen() alex = turtle.Screen() alex.forward(150) alex.left(90) alex.forward(150) ``` The program seems simple enough, Yet I get the following error: ``` ImportError: No module named turtle ``` After some internet research, I read that the turtle module can me found within the tkinter package. And so because I have two different python installations, Python 2.7.3 and Python 3.2.3 I ran the following commands in Ubuntu terminal, in hopes to install the missing python modules: ``` sudo apt-get install python-tk sudo apt-get install python3.2-tk ``` It got me nowhere. So how can I install the missing modules for both versions of python? Thanks!