title: Merge lists of dictionaries based on matching values in one key
body: <p>I have a dictionary</p>
  <pre><code>dicte = [{'value':3, 'content':'some_string'}, {'value':4, 'content':'some_string1'}, {'value':4, 'content':'some_string2'}, {'value':4, 'content':'some_string3'}, {'value':4, 'content':'some_string4'}, {'value':5, 'content':'some_string5'}]
  </code></pre>
  <p>I want to be able to do an operation on that dictionary so that all the <code>content</code> that got the same values regarding the key <code>&quot;value&quot;</code> are regrouped and generate another dictionary based on that</p>
  <p>The result here should be</p>
  <pre><code>new_dicte = [{'value':3, 'content':['some_string']}, {'value':4, 'content':['some_string1', 'some_string2', 'some_string3', 'some_string4']}, {'value':5, 'content':['some_string5']}]
  </code></pre>
  <p>What is the best pythonic way to do this ?</p>