title: Python Error: unsupported operand type(s) for +: 'int' and 'NoneType'
body: <p>I don't understand this error OR what it means. I will paste my code underneath, but I don't think it is really relevant; I just want to understand this error. </p>
  
  <p>It's just a bit of code to add up the letters in all numbers 1 - 1000 (inclusive)</p>
  
  <pre><code>def number_translator(x):
      if x == 1:
          return 3
      elif x == 2:
          return 3
      elif x == 3:
          return 5
      elif x == 4:
          return 4
      elif x == 5:
          return 4
      elif x == 6:
          return 3
      elif x == 7:
          return 5
      elif x == 8:
          return 5
      elif x == 9:
          return 4
      elif x == 10:
          return 3
      elif x == 11:
          return 6
      elif x == 12:
          return 6
      elif x == 14:
          return 8
      elif x == 15:
          return 7
      elif x == 16:
          return 7
      elif x == 17:
          return 9
      elif x == 18:
          return 8
      elif x == 19:
          return 8
      elif x == 20:
          return 6
      elif x == 30:
          return 6
      elif x == 40:
          return 5
      elif x == 50:
          return 5
      elif x == 60:
          return 5
      elif x == 70:
          return 7
      elif x == 80:
          return 6
      elif x == 90:
          return 6
  
  count = 0
  for element in range(1, 1001):
      if element &lt; 21:
          count += number_translator(element)              # for numbers 1 - 20
      elif 20 &lt; element &lt; 100:
          count += number_translator(int(str(element)[0]) * 10) + number_translator(int(str(element)[1]))  # for numbers 21 through 100
      elif element % 100 == 0 and element != 1000:
          count += number_translator(int(str(element)[0])) + 7   # for numbers divisible by 100, but not 1000
      elif element == 1000:
          count += 11                                          # just for 1000
      elif element % 100 &lt; 20:
          count += number_translator(int(str(element)[0])) + 10 + number_translator(int(str(element)[1:3]))      # now I add in numbers like 101 - 120, 201 - 220, etc.
      else:
          count += number_translator(int(str(element)[0])) + 10 + number_translator(int(str(element)[1]) * 10) + number_translator(int(str(element)[2])) # now the rest( 121, 122, 123, 225, 256, 984, etc.)
  
  print(count)
  </code></pre>