title: python np.c_ error"CClass object is not callabel"
body: <p>I'm using ipython 4.0.1 and python 3.5.1, when I call np.c_(), it shows an error</p>
  
  <pre><code>CClass object is not callable.
  </code></pre>
  
  <p>This is my code:</p>
  
  <pre><code>import numpy as np
  
  
  rows = []
  with open('ntumlone.dat') as f:
      rows = [list(map(float, L.split())) for L in f]
  
  arr = np.array(rows)
  
  date = np.c_(np.ones(len(arr)), arr)
  </code></pre>
  
  <p>What's wrong with me?</p>