title: Python: Sum List of Dictionary Values
body: <p>I have the following structure:</p>
  
  <pre><code>"Labour": [{
      "load": 5.00
  }, {
      "edge": 0.00
  }, {
      "unload": 5.00
  }, {
      "load": 5.00
  }, {
      "edge": 0.00
  }, {
      "unload": 5.00
  }, {
      "load": 5.00
  }, {
      "edge": 0.00
  }, {
      "unload": 5.00
  }, {
      "load": 0.00
  }, {
      "edge": 0.00
  }, {
      "unload": 0.00
  }, {
      "load": 0.00
  }, {
      "edge": 0.00
  }, {
      "unload": 0.00
  }],
  </code></pre>
  
  <p>How do I add the values so that, all the load, edge, unload etc are sum together. Also, the dictionary has more keys, I also need to search and add them by keys. I'm using Python 2.7.</p>