title: Is there a better way to write nested if statements in python?
body: <p>Is there a more pythonic way to do nested if else statements than this one:</p>
  
  <pre><code>def convert_what(numeral_sys_1, numeral_sys_2):
  
      if numeral_sys_1 == numeral_sys_2:      
          return 0
      elif numeral_sys_1 == "Hexadecimal":
          if numeral_sys_2 == "Decimal":
              return 1
          elif numeral_sys_2 == "Binary":
              return 2
      elif numeral_sys_1 == "Decimal":
          if numeral_sys_2 == "Hexadecimal":
              return 4
          elif numeral_sys_2 == "Binary":
              return 6
      elif numeral_sys_1 == "Binary":
          if numeral_sys_2 == "Hexadecimal":
              return 5
          elif numeral_sys_2 == "Decimal":
              return 3
      else:
          return 0
  </code></pre>
  
  <p>This script is a part of a simple converter.</p>