title: Numpy list of 1D Arrays to 2D Array
body: <p>I have a large list files that contain 2D numpy arrays pickled through <code>numpy.save</code>.  I am trying to read the first column of each file and create a new 2D array.</p>
  
  <p>I currently read each column using <code>numpy.load</code> with a <code>mmap</code>.  The 1D arrays are now in a list.</p>
  
  <pre><code>col_list = []
  for f in file_list:
      Temp = np.load(f,mmap_mode='r')
      col_list.append(Temp[:,0])
  </code></pre>
  
  <p>How can I convert this into a 2D array?</p>