code: def _check_type(self, obj):
      assert isinstance(obj, FunctionType), "Not a function type"
  
imports: import copy
  import functools
  import sys
  from types import FunctionType
  from traitlets import import_item
  from traitlets.log import get_logger
  from .None import codeutil
label_desc: Use image node_id 2 for calling the CannedFunction obj's underlying member method code with example usage: obj._check_type(obj) without return types