code: def __del__(self):
      _check_call(_LIB.XlearnDataFree(ctypes.byref(self.__handle)))
      self.__handle = None
  
file_path: xlearn/python-package/xlearn/data.py
imports: import os, ctypes
  from numpy import ndarray
  from .base import DataFrame, Series
  import numpy
  from .base import _LIB, XLearnHandle
  from .base import _check_call, c_str
label_desc: Use image node_id 4 for calling the DMatrix obj's underlying member method code with example usage: obj.__del__() without return types