title: Matplotlib fill between multiple lines
body: <p>I would like to fill between 3 lines in matplotlib.pyplot but unfortunately the <code>fill_between</code> gives me opportunity to fill between only two lines. Any ideas how to deal with this?</p>
  
  <p>Edit:</p>
  
  <p>Ok, I did not explain what I really mean since I cannot add the picture with my current reputation so maybe in that way:</p>
  
  <p>I try to fill the polygon bounded by these lines and I have no idea how because fill_between gives me opportunity to fill only area between two of them. Below the fill equation:</p>
  
  <pre><code>y &lt;= 4- 2x
  y &lt;= 3 - 1/2x
  y &lt;= 1 - x
  y &gt;= 0
  x &gt;= 0
  </code></pre>
  
  <p>the x and y bigger than 0 is obvious. I start the plot from (0,0) but I still have 3 lines... </p>
  
  <pre><code>y &lt;= 4- 2x
  y &lt;= 3 - 1/2x
  y &lt;= 1 - x
  </code></pre>