title: NameError: name 'ls' is not defined
body: <p>I am running Windows 7 and just installed Python 2.7.4 and all I get are SyntaxError:'s. For example when I type:</p>
  
  <pre><code>&gt;&gt;&gt;ls   
  </code></pre>
  
  <p>I get</p>
  
  <pre><code>Traceback (most recent call last):
    file "&lt;stdin&gt;", line 1, in &lt;module&gt;
  NameError: name 'ls' is not defined.
  </code></pre>
  
  <p>I am new to Python and have no idea what the problem is.
  Math calculations work as well as code seems to work. It's just commands like <code>cd</code>, <code>ls</code>, <code>sudo apt-get update</code> (and <code>upgrade</code>). Any guidance would be appreciated.</p>