code: def mutate(self):
          '''
          Mutate the field
  
          :rtype: boolean
          :return: True if field the mutated
          '''
          self._initialize()
          if self._exhausted():
              return False
          self._current_index += 1
          self._mutate()
          return Truf mutate(self):
          '''
          Mutate the field
  
          :rtype: boolean
          :return: True if field the mutated
          '''
          self._initialize()
          if self._exhausted():
              return False
          self._current_index += 1
          self._mutate()
          return True
docs: Mutate the field
  
          :rtype: boolean
          :return: True if field the mutated