title: Removing spaces from dictionaries key-value pairs
body: <p>So this is my code for a program adding dicts together.</p>
  
  <pre><code>from collections import Counter
  from itertools import chain
  
  def add_sparse_vectors(lst1,lst2):
      dest = dict(Counter(lst1)+Counter(lst2))
      return dest
  </code></pre>
  
  <p>This is my current output:</p>
  
  <pre><code>&gt;&gt;&gt; v1 = {0:1, 1:3, 2:1}
  &gt;&gt;&gt; v2 = {0:1}
  &gt;&gt;&gt; add_sparse_vectors(v1, v2)
  {0: 2, 1: 3, 2: 1}
  </code></pre>
  
  <p>Problem is that my assignment asks for this output specifically:</p>
  
  <pre><code>&gt;&gt;&gt; v1 = {0:1, 1:3, 2:1}
  &gt;&gt;&gt; v2 = {0:1}
  &gt;&gt;&gt; add_sparse_vectors(v1, v2)
  {0:2, 1:3, 2:1}
  #Note the lack of spaces between the colon and the value in each pair.
  </code></pre>
  
  <p>Does anyone have a solution for removing this specific space from the key-value pairs in the output? Any help is appreciated.</p>