title: List of dictionaries - subtract a constant from each dictionary value
body: <p>I have a list of dictionaries:</p>
  
  <pre><code>list = [{'score': 93, 'numrep': 0}, {'score': 32, 'numrep': 0}, {'score': 39, 'numrep': 0}, {'score': 81, 'numrep': 0}, {'score': 82, 'numrep': 0}]
  </code></pre>
  
  <p>What would be the most efficient way to subtract constant x = 1 from each score value, so I the resulting list would be:</p>
  
  <pre><code>resulting_list = [{'score': 92, 'numrep': 0}, {'score': 31, 'numrep': 0}, {'score': 38, 'numrep': 0}, {'score': 80, 'numrep': 0}, {'score': 81, 'numrep': 0}]
  </code></pre>