title: Convert Dictionary to String
body: <p>I have </p>
  
  <pre><code>  dic = {'value': '123','sort': 'desc','type': 'float'} 
  </code></pre>
  
  <p>I want it become string like: </p>
  
  <pre><code> str = 'value=123&amp;sort=desc&amp;type=float'
  </code></pre>
  
  <p>How can I do it?</p>
  
  <p>Thanks</p>