title: Slice MultiIndex pandas DataFrame by position
body: <p>I am currently trying to to slice a MuliIndex DataFrame that has three levels by position.
  I am using pandas 19.1</p>
  
  <pre><code>Level0  Level1  Level2      Value
  03-00368    A   Item111     6.9
  03-00368    A   Item333     19.2
  03-00368    B   Item111     9.7
  03-00368    B   Item222     17.4
  04-00176    C   Item110     17.4
  04-00176    C   Item111     9.7
  04-00246    D   Item46      12.5
  04-00246    D   Item66      5.6
  04-00246    D   Item99      11.2
  04-00247    E   Item23      12.5
  04-00247    E   Item24      5.6
  04-00247    E   Item111     11.2
  04-00247    F   Item23      7.9
  04-00247    F   Item24      9.7
  04-00247    F   Item111     12.5
  04-00247    G   Item46      11.2
  04-00247    G   Item66      9.7
  04-00247    G   Item999     9.7
  04-00247    H   Item23      11.2
  04-00247    H   Item94      7.9
  04-00247    H   Item111     11.2
  04-00247    I   Item46      5.6
  04-00247    I   Item66      12.5
  04-00247    I   Item888     11.2
  04-00353    J   Item66      12.5
  04-00353    J   Item99      12.5
  04-00354    K   Item43      12.5
  04-00354    K   Item94      12.5
  04-00355    L   Item54      50
  04-00355    L   Item99      50
  </code></pre>
  
  <p>Currently I can achieve:</p>
  
  <pre><code>df.loc[(slice('03-00368', '04-00361'), slice(None), slice(None)), :]
  </code></pre>
  
  <p>But in practice I won't know what the labels will be. I just want to select the first ten level 0's so I tried this(and many other things which are similar):</p>
  
  <pre><code>&gt;&gt;&gt; df.iloc[(slice(0, 10), slice(None), slice(None)), :]
  TypeError: unorderable types: int() &gt;= NoneType()
  </code></pre>
  
  <p>The end goal is to limit the final number of rows displayed, <strong>without breaking up the Level0 index</strong></p>
  
  <pre><code>&gt;&gt;&gt;df.iloc[(0,1,), :]
  Level0   Level1 Level2      Value
  03-00368    A   Item111     6.9
  03-00368    A   Item333     19.2
  </code></pre>
  
  <p>Notice that it only returned the first two rows, I would like the result to be:</p>
  
  <pre><code>Level0  Level1  Level2      Value
  03-00368    A   Item111     6.9
  03-00368    A   Item333     19.2
  03-00368    B   Item111     9.7
  03-00368    B   Item222     17.4
  04-00176    C   Item110     17.4
  04-00176    C   Item111     9.7
  </code></pre>
  
  <p>There are of hacky way to accomplish this but I'm posting because I want to know what I am doing wrong, or why I can't expect to be able to slice MultiIndexes this way.</p>