code: def convertdistmethod(method_str):
          
          if StringClass.string_match(method_str, 'Horizontal'):
              return 'h'
          elif StringClass.string_match(method_str, 'Vertical'):
              return 'v'
          elif StringClass.string_match(method_str, 'Pythagoras'):
              return 'p'
          elif StringClass.string_match(method_str, 'Surface'):
              return 's'
          elif method_str.lower() in ['h', 'v', 'p', 's']:
              return method_str.lower()
          else:
              return 's'
docs: Convert distance method to h, v, p, and s.