title: concatenate numpy string array along an axis?
body: <p>I have a 2-d numpy array of strings. Is there a way to concatenate the strings in each row and then join the resulting strings with a separator string, e.g. a newline?</p>
  
  <p>Example:</p>
  
  <pre><code>pic = np.array([ 'H','e','l','l','o','W','o','r','l','d']).reshape(2,5)
  </code></pre>
  
  <p>I want to get:</p>
  
  <pre><code>"Hello\nWorld\n"
  </code></pre>