title: String literal with triple quotes in function definitions
body: <p>I am following the Python tutorial and at some point they talk about how the 1st statement of a function can be a String Literal. As far as the example goes, this String Literal seems to be done with three <code>"</code>s, giving in the <a href="http://docs.python.org/release/2.7.3/tutorial/controlflow.html#defining-functions" rel="noreferrer">example</a></p>
  
  <pre><code>"""Print a Fibonacci series up to n."""
  </code></pre>
  
  <p>According to this documentation, this would be used mainly to create some kind of automatically produced documentation.</p>
  
  <p>So I am wondering if someone here could explain to me what are these string literals exactly?</p>