title: pass a string in python requests
body: <p>I have a function which require to pass some ids as comma seperated to the url string.</p>
  
  <p>My code: </p>
  
  <pre><code>def shipment(self, orderItemIds):
      url = "https://api.flipkart.net/sellers/orders/shipments"
      payload = {'orderItemsIds':orderItemIds}
      return self.session.get(url, data=payload)
  </code></pre>
  
  <p>I need to pass id1, id2, id3 so that i get a link as:</p>
  
  <pre><code>https://api.flipkart.net/sellers/orders/shipments?orderItemsIds={id1,id2...}
  </code></pre>
  
  <p>I tried to pass it as a string. and as a list too. But it didn't worked.</p>
  
  <pre><code>oid = 'id1,id2,id3'                     # or
  oid = ['id1',id2'','id3']
  </code></pre>
  
  <p>How to do it?</p>
  
  <p>I passed an id as <code>oiids = '230501592'</code>.
  On running response.url, it gives me:</p>
  
  <pre><code>https://api.flipkart.net/sellers/orders/shipments?orderItemsIds
  </code></pre>
  
  <p>It shows that parameter values are not passing in the url string. </p>