Start by running Python.
<notextile>
-<pre><code>$ <span class="userinput">python</span>
+<pre><code>~$ <span class="userinput">python</span>
Python 2.7.3 (default, Jan 2 2013, 13:56:14)
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.