title: _pickle.UnpicklingError: invalid load key, 'D'
body: <p>I create a udp server and client, and want to get data from server, but I always get this wrong <code>_pickle.UnpicklingError: invalid load key, 'D'</code>, I don't know how to solve this problem, please tell me what should I do, thanks.</p>
  
  <p>I use plickle module to dumps and loads my data</p>
  
  <p>client:</p>
  
  <pre><code>...
  data, server = sock.recvfrom(4096)
  data = pickle.loads(data)
  ...
  </code></pre>
  
  <p>server:</p>
  
  <pre><code>...
  a = pickle.dumps(a)
  sent = sock.sendto(a, address)
  ...
  </code></pre>