Find a minimal value in each array in Python
<p>Suppose I have the following data in Python 3.3:</p>

<pre><code>my_array = 
   [{'man_id': 1, '_id': ObjectId('1234566'), 'type': 'worker', 'value': 11}, 
   {'man_id': 1, '_id': ObjectId('1234577'), 'type': 'worker', 'value': 12}],

   [{'man_id': 2, '_id': ObjectId('1234588'), 'type': 'worker', 'value': 11}, 
    {'man_id': 2, '_id': ObjectId('3243'), 'type': 'worker', 'value': 7},
    {'man_id': 2, '_id': ObjectId('54'), 'type': 'worker', 'value': 99},
    {'man_id': 2, '_id': ObjectId('9879878'), 'type': 'worker', 'value': 135}],
   #.............................
   [{'man_id': 13, '_id': ObjectId('111'), 'type': 'worker', 'value': 1}, 
    {'man_id': 13, '_id': ObjectId('222'), 'type': 'worker', 'value': 2},
    {'man_id': 13, '_id': ObjectId('3333'), 'type': 'worker', 'value': 9}]
</code></pre>

<p>There are 3 arrays. How do I find  an element in each array with minimal value?</p>
