title: Dictionary keys and values to separate numpy arrays
body: <p>I have a dictionary as</p>
  
  <pre><code>Samples = {5.207403005022627: 0.69973543384229719, 6.8970222167794759: 0.080782939731898179, 7.8338517407140973: 0.10308033284258854, 8.5301143255505334: 0.018640838362318335, 10.418899728838058: 0.14427355015329846, 5.3983946820220501: 0.51319796560976771}
  </code></pre>
  
  <p>I want to separate the <code>keys</code> and <code>values</code> into 2 <code>numpy</code> arrays.
  I tried <code>np.array(Samples.keys(),dtype=np.float)</code> but i get an error <code>TypeError: float() argument must be a string or a number</code></p>