Unsure how certain code works : <pre><code>Grid = ["A1","A2","A3","B1","B2","B3","C1","C2","C3"]
  print("This is the grid.")
  for i in range(3):
    print("\t".join(Grid[(i*3):(i*3+3)]))
</code></pre>

<p>I was looking for a way to create a 2D 3x3 grid in Python and found this. I want to use it but I'm not sure how line 4 actually works, other than "\t".</p>

<p>Help much appreciated, thanks :)</p>
