code: def parse_int(v, header_d):
      
  
      v = nullify(v)
  
      if v is None:
          return None
  
      try:
          # The converson to float allows converting float strings to ints.
          # The conversion int('2.134') will fail.
          return int(round(float(v), 0))
      except (TypeError, ValueError) as e:
          raise CastingError(int, header_d, v, 'Failed to cast to integer')
docs: Parse as an integer, or a subclass of Int.