title: Efficient way of replacing a key in list of dictionary
body: <p>What is the best list comprehension method of replacing keys with a prefix of "ble_mac_"  as "ble_mac" in a list of dictionary?</p>
  
  <pre><code>Given List : [{'ble_mac_2': 'DCE83F3BC820', 'location': '818'}, 
                {'ble_mac_2': 'DCDC9FD25476', 'location': '819'}, 
                {'ble_mac_3': 'DCDC9FD25473', 'location': '819'}, 
                {'ble_mac_4': 'DCDC9FD25474', 'location': '819'}]
  
  Expected List : [{'ble_mac': 'DCE83F3BC820', 'location': '818'}, 
                   {'ble_mac': 'DCDC9FD25476', 'location': '819'}, 
                   {'ble_mac': 'DCDC9FD25473', 'location': '819'}, 
                   {'ble_mac': 'DCDC9FD25474', 'location': '819'}]
  </code></pre>