code: def __len__(self):
      return len(self._words)
  
imports: from .cnsample import CnSample
  from ..field import ListField, Field
  from ....common.settings import ORIGIN, TASK_MASK, MODIFIED_MASK
label_desc: Use image node_id 3 for calling the DPCnTextField obj's underlying member method code with example usage: obj.__len__() and returns: len