title: Constructing peculiar dictionary out of file (python)
body: <p>I'd like to automaticaly form a <code>dictionary</code> from files that have the following structure. </p>
  
  <pre><code>str11 str12 str13
  str21 str22
  str31 str32 str33 str34
  ...
  </code></pre>
  
  <p>that is, two, three or four strings each line, with spaces in between. The dictionary I'd like to construct out of this list must have following structure:</p>
  
  <pre><code>{str11:(str12,str13),str21:(str22),str31:(str32,str33,str34), ... }
  </code></pre>
  
  <p>(that is, all entries <code>str*1</code> are the keys -- all of them different -- and the remaining ones are the <code>values</code>). What can I use?</p>