title: Make dictionary with for loop in python
body: <p>I want to create a dictionary in python with 40 key/value pairs. They keys should be a1, a2 ... a10, b1, b2 ... b10, c1, c2 ... c10, d1, d2 ... d10. I have a for loop that takes two variables and modifies them so they change after each loop. It loops 40 times to create 40 different values for each of the two variables.</p>
  
  <p>In the dictionary, the value for the key a1, should be the value of x and y in the first loop. The value for the key a2 should be the value of x and y in the second loop. This continues to the key d10 which should have the value of x and y in the 40th loop. </p>
  
  <p>How can I do this? I think I can use a for loop, but since I struggle with understanding for loops, I don't know what I should do. </p>
  
  <p>Here is my code:</p>
  
  <pre><code>x = 200
  y = 202
  
  for i in range(40):
      if y != 202 + 9 * 84:
          y += 84
      else:
          x += 100
          y = y - 9 * 84
  </code></pre>
  
  <p>I want a 
      dictionary that looks like this:</p>
  
  <p><code>dictionary = {'a1':(200, 202), 'a2':(# the value of x and y after looping a second time, here it will be 200, 286)}</code></p>