title: Edit the values in a list of dictionaries?
body: <pre><code>my_dicts = [ 
      { 'key1' : 'value1',
        'key2' : 'value2' },
  
      { 'key1' : 'value1',  
        'key2' : 'value2' },
  
      { 'key1' : 'value1',  
        'key2' : 'value2' }]
  </code></pre>
  
  <p>What would be the most efficient way to replace all instances of 'value2' with 'value3' ?</p>