sort a dict type variable by value in python
<p>I have a dict type variable like <code>{'key1':6,'key2':1,'key3':5,'key4':44}</code> my dictionary contains millions of key:val pair
I want to store it in txt file such that key corresponding to highest val comes first and so on in descending order
eg my txt file will look like</p>

<pre><code>key4: 44
key1: 6
key3: 5
key2: 1
</code></pre>
