title: Python: How to multiply values of a Counter object?
body: <p>I'm looking for a way to multiply the values of a Counter object, i.e.</p>
  
  <pre><code>a =  collections.Counter(one=1, two=2, three=3)
  &gt;&gt;&gt; Counter({'three': 3, 'two': 2, 'one': 1})
  
  b = a*2
  &gt;&gt;&gt; Counter({'three': 6, 'two': 4, 'one': 2})
  </code></pre>
  
  <p>What's the standard way of doing this in python? </p>
  
  <p>Why I want to do this:
  I have a sparse feature vector (bag of words represented by a Counter object) that I would like to normalize.</p>