title: Automatically creating a list
body: <p>I am trying to automatically create the following list:</p>
  
  <pre><code>[Slot('1A', '0', 0), Slot('2A', '0', 0),
   Slot('1B', '0', 0], Slot ('2B,'0', 0), ....]
  </code></pre>
  
  <p>By defining slot as:</p>
  
  <pre><code>class Slot:
      def __init__(self, address , card, stat):
          self.address = address
          self.card = card
          self.stat = stat
  
  
  board = []
  for i in range(1, 13):
      for j in ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']:
          board.append(Slot ((str(i)+j,'0', 0)))
  print(board)
  </code></pre>
  
  <p>Using Python 3.5 in Windows. What is wrong? How I can do that? Thanks.</p>