title: TabError in Python 3
body: <p>Given the following interpreter session: </p>
  
  <pre><code>&gt;&gt;&gt; def func(depth,width):
  ...   if (depth!=0):
  ...     for i in range(width):
  ...       print(depth,i)
  ...       func(depth-1,width)
    File "&lt;stdin&gt;", line 5
      func(depth-1,width)
                    ^
  TabError: inconsistent use of tabs and spaces in indentation
  </code></pre>
  
  <p>Can someone please tell me what is the <code>TabError</code> in my code?</p>