title: How to iterate through a dictionary inside of a list, which is a value of a dictionary
body: <p>I have been having a hard time to understand how should I approach that problem.</p>
  
  <p>I have a dictionary, that contains lists for each key value.</p>
  
  <p>Each list carries n numbers of dictionaries.</p>
  
  <p>Inside of those dictionaries, there is a value that I need to sum up, for each key value of the main dictionary.</p>
  
  <p>I do have no idea how to iterate through a dictionary which is inside of a list, that is a value from a greater dictionary.</p>
  
  <p>I'll provide the main code below. Could someone help me to understand how to approach the problem?</p>
  
  <p>Input, where groups is a dict and 'Hydrofilm...' is one of the key values': </p>
  
  <pre><code>groups['Hydrofilm 10cm x 15cm VP Adh Film Dress']
  </code></pre>
  
  <p>Output, which is a list of dictionary related with that key value:</p>
  
  <pre><code>[{'bnf_code': '20030100236',
    'items': 1,
    'practice': 'P81069',
    'bnf_name': 'Hydrofilm 10cm x 15cm VP Adh Film Dress',
    'nic': 10.6,
    'act_cost': 9.83,
    'quantity': 20},
   {'bnf_code': '20030100236',
    'items': 1,
    'practice': 'P81100',
    'bnf_name': 'Hydrofilm 10cm x 15cm VP Adh Film Dress',
    'nic': 10.6,
    'act_cost': 9.81,
    'quantity': 20},
   {'bnf_code': '20030100236',
    'items': 1,
    'practice': 'J81043',
    'bnf_name': 'Hydrofilm 10cm x 15cm VP Adh Film Dress',
    'nic': 5.3,
    'act_cost': 4.92,
    'quantity': 10},
   {'bnf_code': '20030100236',
    'items': 1,
    'practice': 'J81056',
    'bnf_name': 'Hydrofilm 10cm x 15cm VP Adh Film Dress',
    'nic': 5.3,
    'act_cost': 4.92,
    'quantity': 10},
   {'bnf_code': '20030100236',
    'items': 1,
    'practice': 'J81057',
    'bnf_name': 'Hydrofilm 10cm x 15cm VP Adh Film Dress',
    'nic': 5.3,
    'act_cost': 4.92,
    'quantity': 10}]
  </code></pre>
  
  <p>The key that needs to be sum is the 'items'</p>
  
  <p>Expected results:</p>
  
  <pre><code>sum_list = [1,1,1,1,1]
  </code></pre>