is there a built-in feature to say a dict A contains another dict B?
<p>e.g. dict <code>a</code> contains dict <code>b1</code> because:</p>

<pre><code>a = { 'name': 'mary', 'age': 56, 'gender': 'female' }
b1 = { 'name': 'mary', 'age': 56 }
</code></pre>

<p>But this is False because the value for the key <code>name</code> is different.</p>

<pre><code>b2 = { 'name': 'elizabeth', 'age': 56 }
</code></pre>
