Delete empty dictionary from dictionary of dictionaries : <p>I have a dictionary A:</p>

<pre><code>A =  {"('All', 'Delhi', 'Mumbai')": {}, "('Container', 'Delhi', 'Mumbai')": {}, 
      "('Open', 'Delhi', 'Mumbai')": {12: [12, 22, 25], 7: [9, 5]},
      "('Open', 'Doon', 'Gurgaon')": {10: [1, 2, 24], 8: [4], 9: [28, 8], 7:[21]}}
</code></pre>

<p>I want to remove all the empty dictionaries, How can I do that ?</p>
