title: pass array of array in request post in python
body: <p>I am used request in python. I try to sent a post request and need send array of array. This is my code:</p>
  
  <pre><code>import requests
  
  def connecttomlapipost(url, vector):
     headers = {'content-type': 'application/json'}
     r= requests.post(url, verify=False, auth=('admin', 'admin'), data = vector, headers=headers)
     return r
  
  print connecttomlapipost('https://......', [[2,3],[1,5]])
  </code></pre>
  
  <p>the server return: error 500. I tested using POSTMAN and the server return a correct result</p>