title: permutations in itertools cant print all permutations
body: <p>My question is pretty straight forward:- </p>
  
  <p>in python itertools why can I get a print of all permutations for say [,r =3]: </p>
  
  <pre><code>&gt;&gt;&gt;import itertools
  &gt;&gt;&gt;print list(itertools.permutations([1,2,3], 3))
  [(1, 2, 3), (1, 3, 2), (2, 1, 3), (2, 3, 1), (3, 1, 2), (3, 2, 1)]
  </code></pre>
  
  <p>However only an empty list for [,r >3 e.g 10]: </p>
  
  <pre><code>&gt;&gt;&gt;print list(itertools.permutations([1,2,3], 10))
  [] 
  </code></pre>
  
  <p>is there away of getting round this??</p>