code: def pythonize(self, val):
          
          val = super(IntListProp, self).pythonize(val)
          try:
              return [int(e) for e in val]
          except ValueError as value_except:
              raise PythonizeError(str(value_except))
docs: Convert value into a integer list::
  
          * Try to convert into a list
          * Convert each element into a int
  
          :param val: value to convert
          :type val:
          :return: integer list corresponding to value
          :rtype: list[int]