title: Itertools product ValueError: too many values to unpack (expected 2)
body: <p>I know this question gets repeated a lot but I haven't seen one that deals with this specific problem. I got this function that takes the length of a numpy array, and then takes the cross product:</p>
  
  <pre><code>def solve(tab, vacios):
      if vacios == 0: 
          return is_valid( tab ) #Not important here
      large = len(tab)
      for fila, col in product(range(large), repeat=(large-1)):
  </code></pre>
  
  <p>But I get this error:</p>
  
  <pre><code>ValueError: too many values to unpack (expected 2)
  </code></pre>
  
  <p>I don't really know what to do, so if you could help me it'd be great, thanks!</p>